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<?php |
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namespace XoopsModules\Chess; |
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// ------------------------------------------------------------------------- // |
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// This program is free software; you can redistribute it and/or modify // |
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// it under the terms of the GNU General Public License as published by // |
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// the Free Software Foundation; either version 2 of the License, or // |
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// (at your option) any later version. // |
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// // |
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// You may not change or alter any portion of this comment or credits // |
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// of supporting developers from this source code or any supporting // |
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// source code which is considered copyrighted (c) material of the // |
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// original comment or credit authors. // |
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// // |
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// This program is distributed in the hope that it will be useful, // |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of // |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // |
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// GNU General Public License for more details. // |
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// // |
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// You should have received a copy of the GNU General Public License // |
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// along with this program; if not, write to the Free Software // |
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA // |
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// ------------------------------------------------------------------------ // |
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// Author: Dave Lerner <http://Dave-L.com> // |
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// ------------------------------------------------------------------------ // |
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// Adapted from Online Chess Club (OCC) version 1.0.10, which was written // |
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// by Michael Speck <http://lgames.sf.net> and published under the GNU // |
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// General Public License. // |
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// ------------------------------------------------------------------------ // |
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/** |
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* class ChessGame |
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* |
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* @package chess |
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* @subpackage game |
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*/ |
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/** |
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* The purpose of this class is to handle chess moves. |
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* |
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* An instantiation of this class comprises the data essential for handling chess |
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* moves in a specific game, and provides the requisite methods. |
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* |
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* - Input: Game state and proposed move. |
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* - Processing: Check the legality of the move, and update the game state if the move is legal. |
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* - Output: Indication of the move's legality, and the (possibly) updated game state. |
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* |
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* In addition to the above, there are utility methods for converting between Standard Algebraic |
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* Notation (SAN) and a notation similar to Long Algebraic Notation. |
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* |
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* @package chess |
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* @subpackage game |
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*/ |
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class ChessGame |
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{ |
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/** |
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* Indicates whether object is valid. |
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* |
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* If empty string (''), indicates this is a valid object; otherwise contains an error message. |
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* Should be checked after creating an instance of this class. |
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* |
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* @var string $error |
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*/ |
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public $error; |
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/** |
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* gamestate |
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* |
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* The game state is represented as an array with the following elements: |
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* |
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* - 'fen_piece_placement' |
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* - 'fen_active_color' |
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* - 'fen_castling_availability' |
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* - 'fen_en_passant_target_square' |
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* - 'fen_halfmove_clock' |
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* - 'fen_fullmove_number' |
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* - 'pgn_result' |
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* - 'pgn_fen' |
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* - 'pgn_movetext' |
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* |
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* The elements prefixed with 'fen_' are standard Forsyth-Edwards Notation (FEN) elements, |
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* and the elements prefixed with 'pgn_' are standard Portable Game Notation (PGN) elements. |
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* |
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* Each element is a string. |
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* |
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* @var array $gamestate |
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*/ |
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public $gamestate; |
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/** |
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* board |
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* |
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* A 64-element array, constructed from fen_piece_placement, is used for handling moves. |
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* Its indices are related to the standard tile coordinates as follows: |
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* |
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* <pre> |
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* 8 | 56 57 58 59 60 61 62 63 |
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* 7 | 48 49 50 51 52 53 54 55 |
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* 6 | 40 41 42 43 44 45 46 47 |
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* 5 | 32 33 34 35 36 37 38 39 |
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* 4 | 24 25 26 27 28 29 30 31 |
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* 3 | 16 17 18 19 20 21 22 23 |
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* 2 | 8 9 10 11 12 13 14 15 |
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* 1 | 0 1 2 3 4 5 6 7 |
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* ------------------------ |
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* a b c d e f g h |
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* </pre> |
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* |
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* For example, $board[17] is tile b3 and $board[55] is tile h7. |
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* |
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* @var array $board |
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*/ |
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public $board; |
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/** |
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* for auto-completion of moves |
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* @var string $ac_move |
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*/ |
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public $ac_move; |
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/** |
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* array of white's pieces |
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* @var array $w_figures |
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*/ |
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public $w_figures; |
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/** |
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* array of black's pieces |
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* @var array $b_figures |
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*/ |
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public $b_figures; |
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/** |
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* updated by handleMove, not used now but might be used in future |
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* @var string $last_move |
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*/ |
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public $last_move; |
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/** |
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* updated by handleMove, not used now but might be used in future |
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* @var string $captured_piece |
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*/ |
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public $captured_piece; |
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// -------------- |
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// PUBLIC METHODS |
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// -------------- |
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/** |
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* constructor |
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* |
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* If a failure occurs, $this->error is set to a string containing an error message; |
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* otherwise $this->error is set to an empty string. |
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* |
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* Example: |
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* <pre> |
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* $chessgame = new ChessGame($fen); |
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* if (!empty($chessgame->error)) { |
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* echo "'$fen' invalid: $chessgame->error\n"; |
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* } |
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* </pre> |
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* |
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* @param mixed $param If $param is an array, an existing game is loaded using $param as the nine-element gamestate array described above. |
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* If $param is a non-empty string, a new game is created using $param as a FEN setup position. |
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* Otherwise, a new game is created using the standard starting position. |
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*/ |
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public function __construct($param = null) |
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{ |
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// for now |
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$this->browsing_mode = 0; |
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if (\is_array($param)) { |
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$this->gamestate = $param; |
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$this->error = ''; |
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} elseif (\is_string($param) && !empty($param)) { |
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$this->error = $this->init_gamestate($param); |
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} else { |
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$this->init_gamestate(); |
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$this->error = ''; |
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} |
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} |
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/** |
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* Handle a move. |
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* |
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* @param string $move |
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* @return array A two-element array: |
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* - $move_performed: true if the move was performed and the game state has been updated, false otherwise |
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* - $move_result_text: text message |
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*/ |
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public function move($move) |
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{ |
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empty($this->error) or \trigger_error(_MD_CHESS_ERROR, \E_USER_ERROR); |
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return $this->handleMove($move); |
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} |
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/** |
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* get game state |
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* |
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* @return array |
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*/ |
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public function gamestate() |
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{ |
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empty($this->error) or \trigger_error(_MD_CHESS_ERROR, \E_USER_ERROR); |
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return $this->gamestate; |
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} |
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// ---------------------------------------------------------------- |
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// PRIVATE METHODS - intended for use only by methods of this class |
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// ---------------------------------------------------------------- |
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/** |
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* Initialize gamestate for a new game. |
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* |
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* If a non-empty string $fen is provided, the game is initialized using $fen as a FEN setup position. |
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* Otherwise the game is initialized using the standard starting position. |
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* |
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* @param string $fen |
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* @return string empty string on success, or error message on failure |
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* |
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* @access private |
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*/ |
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public function init_gamestate($fen = null) |
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{ |
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$this->gamestate = []; |
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if (!empty($fen)) { |
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$setup = true; |
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} else { |
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$setup = false; |
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$fen = 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1'; |
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} |
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// check that data is not unreasonably short or long |
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if (\mb_strlen($fen) < 23 || \mb_strlen($fen) > 100) { |
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return _MD_CHESS_FENBAD_LENGTH; // invalid length |
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} |
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$fen_data = \explode(' ', $fen); |
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if (6 != \count($fen_data)) { |
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return _MD_CHESS_FENBAD_FIELD_COUNT; // wrong number of fields |
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} |
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$this->gamestate['fen_piece_placement'] = $fen_data[0]; |
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$this->gamestate['fen_active_color'] = $fen_data[1]; |
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$this->gamestate['fen_castling_availability'] = $fen_data[2]; |
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$this->gamestate['fen_en_passant_target_square'] = $fen_data[3]; |
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$this->gamestate['fen_halfmove_clock'] = $fen_data[4]; |
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$this->gamestate['fen_fullmove_number'] = $fen_data[5]; |
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$this->gamestate['pgn_fen'] = $setup ? $fen : null; |
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$this->gamestate['pgn_result'] = '*'; |
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$this->gamestate['pgn_movetext'] = '*'; |
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if (!$this->fen_piece_placement_to_board()) { |
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return _MD_CHESS_FENBAD_PP_INVALID; // piece_placement invalid |
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} elseif ('w' != $this->gamestate['fen_active_color'] && 'b' != $this->gamestate['fen_active_color']) { |
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return _MD_CHESS_FENBAD_AC_INVALID; // active_color invalid |
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} // Since fen_piece_placement_to_board() checked $fen for the correct number of fields above, $castling_availability is non-empty. |
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elseif ('-' != $this->gamestate['fen_castling_availability'] && !\preg_match('/^K?Q?k?q?$/', $this->gamestate['fen_castling_availability'])) { |
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return _MD_CHESS_FENBAD_CA_INVALID; // castling_availability invalid |
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} elseif ('-' != $this->gamestate['fen_en_passant_target_square'] && !\preg_match('/^[a-h][36]$/', $this->gamestate['fen_en_passant_target_square'])) { |
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return _MD_CHESS_FENBAD_EP_INVALID; // en_passant_target_square invalid |
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} elseif (!\preg_match('/^\d{0,4}$/', $this->gamestate['fen_halfmove_clock'])) { |
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return _MD_CHESS_FENBAD_HC_INVALID; // halfmove_clock invalid |
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} elseif (!\preg_match('/^\d{0,4}$/', $this->gamestate['fen_fullmove_number']) || $this->gamestate['fen_fullmove_number'] < 1) { |
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return _MD_CHESS_FENBAD_FN_INVALID; // fullmove_number invalid |
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} elseif ($this->insufficient_mating_material()) { |
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return _MD_CHESS_FENBAD_MATERIAL; // insufficient mating material |
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} elseif (('w' == $this->gamestate['fen_active_color'] && $this->kingIsUnderAttack('b', 'w')) |
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|| ('b' == $this->gamestate['fen_active_color'] && $this->kingIsUnderAttack('w', 'b'))) { |
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return _MD_CHESS_FENBAD_IN_CHECK; // player to move cannot have opponent in check |
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} elseif ((\mb_strstr($this->gamestate['fen_castling_availability'], 'K') && ('wK' != $this->board[4] || 'wR' != $this->board[7])) |
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|| (\mb_strstr($this->gamestate['fen_castling_availability'], 'Q') && ('wK' != $this->board[4] || 'wR' != $this->board[0])) |
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|| (\mb_strstr($this->gamestate['fen_castling_availability'], 'k') && ('bK' != $this->board[60] || 'bR' != $this->board[63])) |
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|| (\mb_strstr($this->gamestate['fen_castling_availability'], 'q') && ('bK' != $this->board[60] || 'bR' != $this->board[56]))) { |
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return _MD_CHESS_FENBAD_CA_INCONSISTENT; // castling availability inconsistent with piece placement |
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} elseif (('-' != $this->gamestate['fen_en_passant_target_square'] && 3 == $this->gamestate['fen_en_passant_target_square'][1] && 'b' != $this->gamestate['fen_active_color']) |
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300
|
|
|
|| ('-' != $this->gamestate['fen_en_passant_target_square'] && 6 == $this->gamestate['fen_en_passant_target_square'][1] && 'w' != $this->gamestate['fen_active_color'])) { |
|
301
|
|
|
return _MD_CHESS_FENBAD_EP_COLOR; // en passant target square wrong color |
|
302
|
|
|
} elseif ('-' != $this->gamestate['fen_en_passant_target_square'] && 3 == $this->gamestate['fen_en_passant_target_square'][1] |
|
303
|
|
|
&& 'wP' != $this->board[$this->boardCoordToIndex($this->gamestate['fen_en_passant_target_square'][0] . '4')]) { |
|
304
|
|
|
return _MD_CHESS_FENBAD_EP_NO_PAWN; // en passant target square for nonexistent pawn |
|
305
|
|
|
} elseif ('-' != $this->gamestate['fen_en_passant_target_square'] && 6 == $this->gamestate['fen_en_passant_target_square'][1] |
|
306
|
|
|
&& 'bP' != $this->board[$this->boardCoordToIndex($this->gamestate['fen_en_passant_target_square'][0] . '5')]) { |
|
307
|
|
|
return _MD_CHESS_FENBAD_EP_NO_PAWN; // en passant target square for nonexistent pawn |
|
308
|
|
|
} |
|
309
|
|
|
|
|
310
|
|
|
#echo "In " . __CLASS__ . '::' . __FUNCTION__ . "\n";#*#DEBUG# |
|
311
|
|
|
|
|
312
|
|
|
#var_dump('gamestate', $this->gamestate);#*#DEBUG# |
|
313
|
|
|
|
|
314
|
|
|
return ''; // successful |
|
315
|
|
|
} |
|
316
|
|
|
|
|
317
|
|
|
/** |
|
318
|
|
|
* Check whether a path is blocked. |
|
319
|
|
|
* |
|
320
|
|
|
* check a series of tiles given a start, an end tile |
|
321
|
|
|
* which is not included to the check and a position |
|
322
|
|
|
* change for each iteration. return true if not blocked. |
|
323
|
|
|
* all values are given for 1dim board. |
|
324
|
|
|
* |
|
325
|
|
|
* @param int $start |
|
326
|
|
|
* @param int $end |
|
327
|
|
|
* @param int $change |
|
328
|
|
|
* @return bool |
|
329
|
|
|
* |
|
330
|
|
|
* @access private |
|
331
|
|
|
*/ |
|
332
|
|
|
public function pathIsNotBlocked($start, $end, $change) |
|
333
|
|
|
{ |
|
334
|
|
|
for ($pos = $start; $pos != $end; $pos += $change) { |
|
335
|
|
|
#echo "path: $pos: '$this->board[$pos]' "; #*#DEBUG# |
|
336
|
|
|
|
|
337
|
|
|
if (!$this->is_empty_tile($pos)) { |
|
338
|
|
|
return 0; |
|
339
|
|
|
} |
|
340
|
|
|
} |
|
341
|
|
|
|
|
342
|
|
|
return 1; |
|
343
|
|
|
} |
|
344
|
|
|
|
|
345
|
|
|
/** |
|
346
|
|
|
* Get path. |
|
347
|
|
|
* |
|
348
|
|
|
* get the empty tiles between start and end as an 1dim array. |
|
349
|
|
|
* whether the path is clear is not checked. |
|
350
|
|
|
* |
|
351
|
|
|
* @param int $start |
|
352
|
|
|
* @param int $end |
|
353
|
|
|
* @param int $change |
|
354
|
|
|
* @return array |
|
355
|
|
|
* |
|
356
|
|
|
* @access private |
|
357
|
|
|
*/ |
|
358
|
|
|
public function getPath($start, $end, $change) |
|
359
|
|
|
{ |
|
360
|
|
|
$path = []; |
|
361
|
|
|
|
|
362
|
|
|
for ($pos = $start; $pos != $end; $pos += $change) { |
|
363
|
|
|
$path[] = $pos; |
|
364
|
|
|
} |
|
365
|
|
|
|
|
366
|
|
|
return $path; |
|
367
|
|
|
} |
|
368
|
|
|
|
|
369
|
|
|
/** |
|
370
|
|
|
* get path change |
|
371
|
|
|
* |
|
372
|
|
|
* get the change value that must be added to create |
|
373
|
|
|
* the 1dim path for figure moving from fig_pos to |
|
374
|
|
|
* dest_pos. it is assumed that the movement is valid! |
|
375
|
|
|
* no additional checks as in tileIsReachable are |
|
376
|
|
|
* performed. rook, queen and bishop are the only |
|
377
|
|
|
* units that can have empty tiles in between. |
|
378
|
|
|
* |
|
379
|
|
|
* @param string $fig |
|
380
|
|
|
* @param int $fig_pos |
|
381
|
|
|
* @param int $dest_pos |
|
382
|
|
|
* @return int |
|
383
|
|
|
* |
|
384
|
|
|
* @access private |
|
385
|
|
|
*/ |
|
386
|
|
|
public function getPathChange($fig, $fig_pos, $dest_pos) |
|
387
|
|
|
{ |
|
388
|
|
|
$change = 0; |
|
389
|
|
|
|
|
390
|
|
|
$fy = \floor($fig_pos / 8); |
|
391
|
|
|
|
|
392
|
|
|
$fx = $fig_pos % 8; |
|
393
|
|
|
|
|
394
|
|
|
$dx = $dest_pos % 8; |
|
395
|
|
|
|
|
396
|
|
|
$dy = \floor($dest_pos / 8); |
|
397
|
|
|
|
|
398
|
|
|
switch ($fig) { |
|
399
|
|
|
/* bishop */ case 'B': |
|
400
|
|
|
$change = $dy < $fy ? -8 : 8; |
|
401
|
|
|
$change += $dx < $fx ? -1 : 1; |
|
402
|
|
|
break; |
|
403
|
|
|
/* rook */ case 'R': |
|
404
|
|
|
if ($fx == $dx) { |
|
405
|
|
|
$change = $dy < $fy ? -8 : 8; |
|
406
|
|
|
} else { |
|
407
|
|
|
$change = $dx < $fx ? -1 : 1; |
|
408
|
|
|
} |
|
409
|
|
|
break; |
|
410
|
|
|
/* queen */ case 'Q': |
|
411
|
|
|
if (\abs($fx - $dx) == \abs($fy - $dy)) { |
|
412
|
|
|
$change = $dy < $fy ? -8 : 8; |
|
413
|
|
|
|
|
414
|
|
|
$change += $dx < $fx ? -1 : 1; |
|
415
|
|
|
} elseif ($fx == $dx) { |
|
416
|
|
|
$change = $dy < $fy ? -8 : 8; |
|
417
|
|
|
} else { |
|
418
|
|
|
$change = $dx < $fx ? -1 : 1; |
|
419
|
|
|
} |
|
420
|
|
|
break; |
|
421
|
|
|
} |
|
422
|
|
|
|
|
423
|
|
|
return $change; |
|
424
|
|
|
} |
|
425
|
|
|
|
|
426
|
|
|
/** |
|
427
|
|
|
* Check whether a tile is reachable. |
|
428
|
|
|
* |
|
429
|
|
|
* check whether dest_pos is in reach for unit of fig_type |
|
430
|
|
|
* at tile fig_pos. it is not checked whether the tile |
|
431
|
|
|
* itself is occupied but only the tiles in between. |
|
432
|
|
|
* this function does not check pawns. |
|
433
|
|
|
* |
|
434
|
|
|
* @param string $fig |
|
435
|
|
|
* @param int $fig_pos |
|
436
|
|
|
* @param int $dest_pos |
|
437
|
|
|
* @return bool |
|
438
|
|
|
* |
|
439
|
|
|
* @access private |
|
440
|
|
|
*/ |
|
441
|
|
|
public function tileIsReachable($fig, $fig_pos, $dest_pos) |
|
442
|
|
|
{ |
|
443
|
|
|
if ($fig_pos == $dest_pos) { |
|
444
|
|
|
return; |
|
445
|
|
|
} |
|
446
|
|
|
|
|
447
|
|
|
$result = 0; |
|
448
|
|
|
|
|
449
|
|
|
$fy = \floor($fig_pos / 8); |
|
450
|
|
|
|
|
451
|
|
|
$fx = $fig_pos % 8; |
|
452
|
|
|
|
|
453
|
|
|
$dy = \floor($dest_pos / 8); |
|
454
|
|
|
|
|
455
|
|
|
$dx = $dest_pos % 8; |
|
456
|
|
|
|
|
457
|
|
|
/* DEBUG: echo "$fx,$fy --> $dx,$dy: "; */ |
|
458
|
|
|
|
|
459
|
|
|
switch ($fig) { |
|
460
|
|
|
/* knight */ case 'N': |
|
461
|
|
|
if (1 == \abs($fx - $dx) && 2 == \abs($fy - $dy)) { |
|
462
|
|
|
$result = 1; |
|
463
|
|
|
} |
|
464
|
|
|
if (1 == \abs($fy - $dy) && 2 == \abs($fx - $dx)) { |
|
465
|
|
|
$result = 1; |
|
466
|
|
|
} |
|
467
|
|
|
break; |
|
468
|
|
|
/* bishop */ case 'B': |
|
469
|
|
|
if (\abs($fx - $dx) != \abs($fy - $dy)) { |
|
470
|
|
|
break; |
|
471
|
|
|
} |
|
472
|
|
|
if ($dy < $fy) { |
|
473
|
|
|
$change = -8; |
|
474
|
|
|
} else { |
|
475
|
|
|
$change = 8; |
|
476
|
|
|
} |
|
477
|
|
|
if ($dx < $fx) { |
|
478
|
|
|
$change -= 1; |
|
479
|
|
|
} else { |
|
480
|
|
|
$change += 1; |
|
481
|
|
|
} |
|
482
|
|
|
if ($this->pathIsNotBlocked($fig_pos + $change, $dest_pos, $change)) { |
|
483
|
|
|
$result = 1; |
|
484
|
|
|
} |
|
485
|
|
|
break; |
|
486
|
|
|
/* rook */ case 'R': |
|
487
|
|
|
if ($fx != $dx && $fy != $dy) { |
|
488
|
|
|
break; |
|
489
|
|
|
} |
|
490
|
|
|
if ($fx == $dx) { |
|
491
|
|
|
if ($dy < $fy) { |
|
492
|
|
|
$change = -8; |
|
493
|
|
|
} else { |
|
494
|
|
|
$change = 8; |
|
495
|
|
|
} |
|
496
|
|
|
} else { |
|
497
|
|
|
if ($dx < $fx) { |
|
498
|
|
|
$change = -1; |
|
499
|
|
|
} else { |
|
500
|
|
|
$change = 1; |
|
501
|
|
|
} |
|
502
|
|
|
} |
|
503
|
|
|
if ($this->pathIsNotBlocked($fig_pos + $change, $dest_pos, $change)) { |
|
504
|
|
|
$result = 1; |
|
505
|
|
|
} |
|
506
|
|
|
break; |
|
507
|
|
|
/* queen */ case 'Q': |
|
508
|
|
|
if (\abs($fx - $dx) != \abs($fy - $dy) && $fx != $dx && $fy != $dy) { |
|
509
|
|
|
break; |
|
510
|
|
|
} |
|
511
|
|
|
if (\abs($fx - $dx) == \abs($fy - $dy)) { |
|
512
|
|
|
if ($dy < $fy) { |
|
513
|
|
|
$change = -8; |
|
514
|
|
|
} else { |
|
515
|
|
|
$change = 8; |
|
516
|
|
|
} |
|
517
|
|
|
|
|
518
|
|
|
if ($dx < $fx) { |
|
519
|
|
|
$change -= 1; |
|
520
|
|
|
} else { |
|
521
|
|
|
$change += 1; |
|
522
|
|
|
} |
|
523
|
|
|
} elseif ($fx == $dx) { |
|
524
|
|
|
if ($dy < $fy) { |
|
525
|
|
|
$change = -8; |
|
526
|
|
|
} else { |
|
527
|
|
|
$change = 8; |
|
528
|
|
|
} |
|
529
|
|
|
} else { |
|
530
|
|
|
if ($dx < $fx) { |
|
531
|
|
|
$change = -1; |
|
532
|
|
|
} else { |
|
533
|
|
|
$change = 1; |
|
534
|
|
|
} |
|
535
|
|
|
} |
|
536
|
|
|
if ($this->pathIsNotBlocked($fig_pos + $change, $dest_pos, $change)) { |
|
537
|
|
|
$result = 1; |
|
538
|
|
|
} |
|
539
|
|
|
break; |
|
540
|
|
|
/* king */ case 'K': |
|
541
|
|
|
if (\abs($fx - $dx) > 1 || \abs($fy - $dy) > 1) { |
|
542
|
|
|
break; |
|
543
|
|
|
} |
|
544
|
|
|
$kings = 0; |
|
545
|
|
|
$adj_tiles = $this->getAdjTiles($dest_pos); |
|
546
|
|
|
foreach ($adj_tiles as $tile) { |
|
547
|
|
|
if ('K' == $this->board[$tile][1]) { |
|
548
|
|
|
$kings++; |
|
549
|
|
|
} |
|
550
|
|
|
} |
|
551
|
|
|
if (2 == $kings) { |
|
552
|
|
|
break; |
|
553
|
|
|
} |
|
554
|
|
|
$result = 1; |
|
555
|
|
|
break; |
|
556
|
|
|
} |
|
557
|
|
|
|
|
558
|
|
|
/* DEBUG: echo " $result<br>"; */ |
|
559
|
|
|
|
|
560
|
|
|
return $result; |
|
561
|
|
|
} |
|
562
|
|
|
|
|
563
|
|
|
/** |
|
564
|
|
|
* Check whether a pawn can attack a tile. |
|
565
|
|
|
* |
|
566
|
|
|
* @param int $fig_pos Position of pawn |
|
567
|
|
|
* @param int $dest_pos Tile to check |
|
568
|
|
|
* @return bool True if pawn can attack |
|
569
|
|
|
* |
|
570
|
|
|
* @access private |
|
571
|
|
|
*/ |
|
572
|
|
|
public function checkPawnAttack($fig_pos, $dest_pos) |
|
573
|
|
|
{ |
|
574
|
|
|
if ('w' == $this->board[$fig_pos][0]) { |
|
575
|
|
|
if ($fig_pos % 8 > 0 && $dest_pos == $fig_pos + 7) { |
|
576
|
|
|
return 1; |
|
577
|
|
|
} |
|
578
|
|
|
|
|
579
|
|
|
if ($fig_pos % 8 < 7 && $dest_pos == $fig_pos + 9) { |
|
580
|
|
|
return 1; |
|
581
|
|
|
} |
|
582
|
|
|
} elseif ('b' == $this->board[$fig_pos][0]) { |
|
583
|
|
|
if ($fig_pos % 8 < 7 && $dest_pos == $fig_pos - 7) { |
|
584
|
|
|
return 1; |
|
585
|
|
|
} |
|
586
|
|
|
|
|
587
|
|
|
if ($fig_pos % 8 > 0 && $dest_pos == $fig_pos - 9) { |
|
588
|
|
|
return 1; |
|
589
|
|
|
} |
|
590
|
|
|
} |
|
591
|
|
|
|
|
592
|
|
|
return 0; |
|
593
|
|
|
} |
|
594
|
|
|
|
|
595
|
|
|
/** |
|
596
|
|
|
* Check whether a pawn move is legal. |
|
597
|
|
|
* |
|
598
|
|
|
* check whether pawn at figpos may move to destpos. |
|
599
|
|
|
* first move may be two tiles instead of just one. |
|
600
|
|
|
* again the last tile is not checked but just the path |
|
601
|
|
|
* in between. |
|
602
|
|
|
* |
|
603
|
|
|
* @param int $fig_pos Position of pawn. |
|
604
|
|
|
* @param int $dest_pos Destination tile. |
|
605
|
|
|
* @return bool True if move is legal |
|
606
|
|
|
* |
|
607
|
|
|
* @access private |
|
608
|
|
|
*/ |
|
609
|
|
|
public function checkPawnMove($fig_pos, $dest_pos) |
|
610
|
|
|
{ |
|
611
|
|
|
$first_move = 0; |
|
612
|
|
|
|
|
613
|
|
|
if ('w' == $this->board[$fig_pos][0]) { |
|
614
|
|
|
if ($fig_pos >= 8 && $fig_pos <= 15) { |
|
615
|
|
|
$first_move = 1; |
|
616
|
|
|
} |
|
617
|
|
|
|
|
618
|
|
|
if ($dest_pos == $fig_pos + 8) { |
|
619
|
|
|
return 1; |
|
620
|
|
|
} |
|
621
|
|
|
|
|
622
|
|
|
if ($first_move && ($dest_pos == $fig_pos + 16)) { |
|
623
|
|
|
if ($this->is_empty_tile($fig_pos + 8)) { |
|
624
|
|
|
return 1; |
|
625
|
|
|
} |
|
626
|
|
|
} |
|
627
|
|
|
} elseif ('b' == $this->board[$fig_pos][0]) { |
|
628
|
|
|
if ($fig_pos >= 48 && $fig_pos <= 55) { |
|
629
|
|
|
$first_move = 1; |
|
630
|
|
|
} |
|
631
|
|
|
|
|
632
|
|
|
if ($dest_pos == $fig_pos - 8) { |
|
633
|
|
|
return 1; |
|
634
|
|
|
} |
|
635
|
|
|
|
|
636
|
|
|
if ($first_move && ($dest_pos == $fig_pos - 16)) { |
|
637
|
|
|
if ($this->is_empty_tile($fig_pos - 8)) { |
|
638
|
|
|
return 1; |
|
639
|
|
|
} |
|
640
|
|
|
} |
|
641
|
|
|
} |
|
642
|
|
|
|
|
643
|
|
|
return 0; |
|
644
|
|
|
} |
|
645
|
|
|
|
|
646
|
|
|
/** |
|
647
|
|
|
* Check whether a tile is under attack by the specified player. |
|
648
|
|
|
* |
|
649
|
|
|
* @param string $opp Attacking color ('w' or 'b') |
|
650
|
|
|
* @param int $dest_pos Tile to check |
|
651
|
|
|
* @return bool |
|
652
|
|
|
* |
|
653
|
|
|
* @access private |
|
654
|
|
|
*/ |
|
655
|
|
|
public function tileIsUnderAttack($opp, $dest_pos) |
|
656
|
|
|
{ |
|
657
|
|
|
#var_dump('tileIsUnderAttack, opp', $opp, 'dest_pos', $dest_pos, 'board', $board);#*#DEBUG# |
|
658
|
|
|
|
|
659
|
|
|
for ($i = 0; $i < 64; $i++) { |
|
660
|
|
|
if ($this->board[$i][0] == $opp) { |
|
661
|
|
|
if (('P' == $this->board[$i][1] && $this->checkPawnAttack($i, $dest_pos)) |
|
662
|
|
|
|| ('P' != $this->board[$i][1] |
|
663
|
|
|
&& $this->tileIsReachable($this->board[$i][1], $i, $dest_pos))) { |
|
664
|
|
|
/*DEBUG: echo "attack test: $i: ",$opp,"P<br>"; */ |
|
665
|
|
|
|
|
666
|
|
|
return 1; |
|
667
|
|
|
} |
|
668
|
|
|
} |
|
669
|
|
|
} |
|
670
|
|
|
|
|
671
|
|
|
return 0; |
|
672
|
|
|
} |
|
673
|
|
|
|
|
674
|
|
|
/** |
|
675
|
|
|
* Check whether a player's king can be attacked by his opponent. |
|
676
|
|
|
* |
|
677
|
|
|
* @param string $player Player's color ('w' or 'b') |
|
678
|
|
|
* @param string $opp Opponent's color ('w' or 'b') |
|
679
|
|
|
* @return bool |
|
680
|
|
|
* |
|
681
|
|
|
* @access private |
|
682
|
|
|
*/ |
|
683
|
|
|
public function kingIsUnderAttack($player, $opp) |
|
684
|
|
|
{ |
|
685
|
|
|
#var_dump('kingIsUnderAttack, player', $player, 'opp', $opp, 'board', $board);#*#DEBUG# |
|
686
|
|
|
|
|
687
|
|
|
for ($i = 0; $i < 64; $i++) { |
|
688
|
|
|
if ($this->board[$i][0] == $player && 'K' == $this->board[$i][1]) { |
|
689
|
|
|
$king_pos = $i; |
|
690
|
|
|
|
|
691
|
|
|
break; |
|
692
|
|
|
} |
|
693
|
|
|
} |
|
694
|
|
|
|
|
695
|
|
|
/*DEBUG: echo "$player king is at $king_pos<br>"; */ |
|
696
|
|
|
|
|
697
|
|
|
return $this->tileIsUnderAttack($opp, $king_pos); |
|
698
|
|
|
} |
|
699
|
|
|
|
|
700
|
|
|
/** |
|
701
|
|
|
* Check whether player's king is checkmated by his opponent. |
|
702
|
|
|
* |
|
703
|
|
|
* @param string $player Player's color ('w' or 'b') |
|
704
|
|
|
* @param string $opp Opponent's color ('w' or 'b') |
|
705
|
|
|
* @return bool |
|
706
|
|
|
* |
|
707
|
|
|
* @access private |
|
708
|
|
|
*/ |
|
709
|
|
|
public function isCheckMate($player, $opp) |
|
710
|
|
|
{ |
|
711
|
|
|
for ($i = 0; $i < 64; $i++) { |
|
712
|
|
|
if ($this->board[$i][0] == $player && 'K' == $this->board[$i][1]) { |
|
713
|
|
|
$king_pos = $i; |
|
714
|
|
|
|
|
715
|
|
|
$king_x = $i % 8; |
|
716
|
|
|
|
|
717
|
|
|
$king_y = \floor($i / 8); |
|
718
|
|
|
|
|
719
|
|
|
break; |
|
720
|
|
|
} |
|
721
|
|
|
} |
|
722
|
|
|
|
|
723
|
|
|
/* test adjacent tiles while king is temporarly removed */ |
|
724
|
|
|
|
|
725
|
|
|
$adj_tiles = $this->getAdjTiles($king_pos); |
|
726
|
|
|
|
|
727
|
|
|
$contents = $this->board[$king_pos]; |
|
728
|
|
|
|
|
729
|
|
|
$this->clear_tile($king_pos); |
|
730
|
|
|
|
|
731
|
|
|
foreach ($adj_tiles as $dest_pos) { |
|
732
|
|
|
if ($this->board[$dest_pos][0] == $player) { |
|
733
|
|
|
continue; |
|
734
|
|
|
} |
|
735
|
|
|
|
|
736
|
|
|
if ($this->tileIsUnderAttack($opp, $dest_pos)) { |
|
737
|
|
|
continue; |
|
738
|
|
|
} |
|
739
|
|
|
|
|
740
|
|
|
$this->board[$king_pos] = $contents; |
|
741
|
|
|
|
|
742
|
|
|
return 0; |
|
743
|
|
|
} |
|
744
|
|
|
|
|
745
|
|
|
$this->board[$king_pos] = $contents; |
|
746
|
|
|
|
|
747
|
|
|
/* DEBUG: echo "King cannot escape by itself! "; */ |
|
748
|
|
|
|
|
749
|
|
|
/* get all figures that attack the king */ |
|
750
|
|
|
|
|
751
|
|
|
$attackers = []; |
|
752
|
|
|
|
|
753
|
|
|
$count = 0; |
|
754
|
|
|
|
|
755
|
|
|
for ($i = 0; $i < 64; $i++) { |
|
756
|
|
|
if ($this->board[$i][0] == $opp) { |
|
757
|
|
|
if (('P' == $this->board[$i][1] && $this->checkPawnAttack($i, $king_pos)) |
|
758
|
|
|
|| ('P' != $this->board[$i][1] |
|
759
|
|
|
&& $this->tileIsReachable($this->board[$i][1], $i, $king_pos))) { |
|
760
|
|
|
$attackers[$count++] = $i; |
|
761
|
|
|
} |
|
762
|
|
|
} |
|
763
|
|
|
} |
|
764
|
|
|
|
|
765
|
|
|
/* DEBUG: |
|
766
|
|
|
for( $i = 0; $i < $count; $i++ ) |
|
767
|
|
|
echo "Attacker: $attackers[$i] "; |
|
768
|
|
|
echo "Attackercount: ",count($attackers), " "; */ |
|
769
|
|
|
|
|
770
|
|
|
/* if more than one there is no chance to escape */ |
|
771
|
|
|
|
|
772
|
|
|
if ($count > 1) { |
|
773
|
|
|
return 1; |
|
774
|
|
|
} |
|
775
|
|
|
|
|
776
|
|
|
/* check whether attacker can be killed by own figure */ |
|
777
|
|
|
|
|
778
|
|
|
$dest_pos = $attackers[0]; |
|
779
|
|
|
|
|
780
|
|
|
for ($i = 0; $i < 64; $i++) { |
|
781
|
|
|
if ($this->board[$i][0] == $player) { |
|
782
|
|
|
if (('P' == $this->board[$i][1] && $this->checkPawnAttack($i, $dest_pos)) |
|
783
|
|
|
|| ('P' != $this->board[$i][1] && 'K' != $this->board[$i][1] |
|
784
|
|
|
&& $this->tileIsReachable($this->board[$i][1], $i, $dest_pos)) |
|
785
|
|
|
|| ('K' == $this->board[$i][1] |
|
786
|
|
|
&& $this->tileIsReachable($this->board[$i][1], $i, $dest_pos) |
|
787
|
|
|
&& !$this->tileIsUnderAttack($opp, $dest_pos))) { |
|
788
|
|
|
/* DEBUG: echo "candidate: $i "; */ |
|
789
|
|
|
|
|
790
|
|
|
$can_kill_atk = 0; |
|
791
|
|
|
|
|
792
|
|
|
$contents_def = $this->board[$i]; |
|
793
|
|
|
|
|
794
|
|
|
$contents_atk = $this->board[$dest_pos]; |
|
795
|
|
|
|
|
796
|
|
|
$this->board[$dest_pos] = $this->board[$i]; |
|
797
|
|
|
|
|
798
|
|
|
$this->clear_tile($i); |
|
799
|
|
|
|
|
800
|
|
|
if (!$this->tileIsUnderAttack($opp, $king_pos)) { |
|
801
|
|
|
$can_kill_atk = 1; |
|
802
|
|
|
} |
|
803
|
|
|
|
|
804
|
|
|
$this->board[$i] = $contents_def; |
|
805
|
|
|
|
|
806
|
|
|
$this->board[$dest_pos] = $contents_atk; |
|
807
|
|
|
|
|
808
|
|
|
if ($can_kill_atk) { |
|
809
|
|
|
/* DEBUG: echo "$i can kill attacker"; */ |
|
810
|
|
|
|
|
811
|
|
|
return 0; |
|
812
|
|
|
} |
|
813
|
|
|
} |
|
814
|
|
|
} |
|
815
|
|
|
} |
|
816
|
|
|
|
|
817
|
|
|
/* check whether own unit can block the way */ |
|
818
|
|
|
|
|
819
|
|
|
/* if attacking unit is a knight there |
|
820
|
|
|
* is no way to block the path */ |
|
821
|
|
|
|
|
822
|
|
|
if ('N' == $this->board[$dest_pos][1]) { |
|
823
|
|
|
return 1; |
|
824
|
|
|
} |
|
825
|
|
|
|
|
826
|
|
|
/* if enemy is adjacent to king there is no |
|
827
|
|
|
* way either */ |
|
828
|
|
|
|
|
829
|
|
|
$dest_x = $dest_pos % 8; |
|
830
|
|
|
|
|
831
|
|
|
$dest_y = \floor($dest_pos / 8); |
|
832
|
|
|
|
|
833
|
|
|
if (\abs($dest_x - $king_x) <= 1 && \abs($dest_y - $king_y) <= 1) { |
|
834
|
|
|
return 1; |
|
835
|
|
|
} |
|
836
|
|
|
|
|
837
|
|
|
/* get the list of tiles between king and attacking |
|
838
|
|
|
* unit that can be blocked to stop the attack */ |
|
839
|
|
|
|
|
840
|
|
|
$change = $this->getPathChange($this->board[$dest_pos][1], $dest_pos, $king_pos); |
|
841
|
|
|
|
|
842
|
|
|
/* DEBUG: echo "path change: $change "; */ |
|
843
|
|
|
|
|
844
|
|
|
$path = $this->getPath($dest_pos + $change, $king_pos, $change); |
|
845
|
|
|
|
|
846
|
|
|
/* DEBUG: foreach( $path as $tile ) echo "tile: $tile "; */ |
|
847
|
|
|
|
|
848
|
|
|
foreach ($path as $pos) { |
|
849
|
|
|
for ($i = 0; $i < 64; $i++) { |
|
850
|
|
|
if ($this->board[$i][0] == $player) { |
|
851
|
|
|
if (('P' == $this->board[$i][1] && $this->checkPawnMove($i, $pos)) |
|
852
|
|
|
|| ('P' != $this->board[$i][1] && 'K' != $this->board[$i][1] |
|
853
|
|
|
&& $this->tileIsReachable($this->board[$i][1], $i, $pos))) { |
|
854
|
|
|
/* DEBUG: echo "$i can block "; */ |
|
855
|
|
|
|
|
856
|
|
|
return 0; |
|
857
|
|
|
} |
|
858
|
|
|
} |
|
859
|
|
|
} |
|
860
|
|
|
} |
|
861
|
|
|
|
|
862
|
|
|
return 1; |
|
863
|
|
|
} |
|
864
|
|
|
|
|
865
|
|
|
/** |
|
866
|
|
|
* Check whether player is stalemated. |
|
867
|
|
|
* |
|
868
|
|
|
* @param string $player Color of player who has the move ('w' or 'b') |
|
869
|
|
|
* @param string $opp Opponent's color ('w' or 'b') |
|
870
|
|
|
* @return bool |
|
871
|
|
|
* |
|
872
|
|
|
* @todo recognize when move is not possible because of check |
|
873
|
|
|
* |
|
874
|
|
|
* @access private |
|
875
|
|
|
*/ |
|
876
|
|
|
public function isStaleMate($player, $opp) |
|
877
|
|
|
{ |
|
878
|
|
|
for ($i = 0; $i < 64; $i++) { |
|
879
|
|
|
if ($this->board[$i][0] == $player) { |
|
880
|
|
|
switch ($this->board[$i][1]) { |
|
881
|
|
|
case 'K': |
|
882
|
|
|
$adj_tiles = $this->getAdjTiles($i); |
|
883
|
|
|
foreach ($adj_tiles as $pos) { |
|
884
|
|
|
if ($this->board[$pos][0] == $player) { |
|
885
|
|
|
continue; |
|
886
|
|
|
} |
|
887
|
|
|
|
|
888
|
|
|
if ($this->tileIsUnderAttack($opp, $pos)) { |
|
889
|
|
|
continue; |
|
890
|
|
|
} |
|
891
|
|
|
|
|
892
|
|
|
return 0; |
|
893
|
|
|
} |
|
894
|
|
|
/* DEBUG: echo "King cannot escape by itself! "; */ |
|
895
|
|
|
break; |
|
896
|
|
|
case 'P': |
|
897
|
|
|
if ('w' == $player) { |
|
898
|
|
|
if ($this->is_empty_tile($i + 8)) { |
|
899
|
|
|
return 0; |
|
900
|
|
|
} |
|
901
|
|
|
|
|
902
|
|
|
if ($i % 8 > 0 && $this->board[$i + 7][0] != $player) { |
|
903
|
|
|
return 0; |
|
904
|
|
|
} |
|
905
|
|
|
|
|
906
|
|
|
if ($i % 8 < 7 && $this->board[$i + 9][0] != $player) { |
|
907
|
|
|
return 0; |
|
908
|
|
|
} |
|
909
|
|
|
} else { |
|
910
|
|
|
if ($this->is_empty_tile($i - 8)) { |
|
911
|
|
|
return 0; |
|
912
|
|
|
} |
|
913
|
|
|
|
|
914
|
|
|
if ($i % 8 > 0 && $this->board[$i - 9][0] != $player) { |
|
915
|
|
|
return 0; |
|
916
|
|
|
} |
|
917
|
|
|
|
|
918
|
|
|
if ($i % 8 < 7 && $this->board[$i - 7][0] != $player) { |
|
919
|
|
|
return 0; |
|
920
|
|
|
} |
|
921
|
|
|
} |
|
922
|
|
|
break; |
|
923
|
|
|
case 'B': |
|
924
|
|
|
if ($i - 9 >= 0 && $this->board[$i - 9][0] != $player) { |
|
925
|
|
|
return 0; |
|
926
|
|
|
} |
|
927
|
|
|
if ($i - 7 >= 0 && $this->board[$i - 7][0] != $player) { |
|
928
|
|
|
return 0; |
|
929
|
|
|
} |
|
930
|
|
|
if ($i + 9 <= 63 && $this->board[$i + 9][0] != $player) { |
|
931
|
|
|
return 0; |
|
932
|
|
|
} |
|
933
|
|
|
if ($i + 7 <= 63 && $this->board[$i + 7][0] != $player) { |
|
934
|
|
|
return 0; |
|
935
|
|
|
} |
|
936
|
|
|
break; |
|
937
|
|
|
case 'R': |
|
938
|
|
|
if ($i - 8 >= 0 && $this->board[$i - 8][0] != $player) { |
|
939
|
|
|
return 0; |
|
940
|
|
|
} |
|
941
|
|
|
if ($i - 1 >= 0 && $this->board[$i - 1][0] != $player) { |
|
942
|
|
|
return 0; |
|
943
|
|
|
} |
|
944
|
|
|
if ($i + 8 <= 63 && $this->board[$i + 8][0] != $player) { |
|
945
|
|
|
return 0; |
|
946
|
|
|
} |
|
947
|
|
|
if ($i + 1 <= 63 && $this->board[$i + 1][0] != $player) { |
|
948
|
|
|
return 0; |
|
949
|
|
|
} |
|
950
|
|
|
break; |
|
951
|
|
|
case 'Q': |
|
952
|
|
|
$adj_tiles = $this->getAdjTiles($i); |
|
953
|
|
|
foreach ($adj_tiles as $pos) { |
|
954
|
|
|
if ($this->board[$pos][0] != $player) { |
|
955
|
|
|
return 0; |
|
956
|
|
|
} |
|
957
|
|
|
} |
|
958
|
|
|
break; |
|
959
|
|
|
case 'N': |
|
960
|
|
|
if ($i - 17 >= 0 && $this->board[$i - 17][0] != $player) { |
|
961
|
|
|
return 0; |
|
962
|
|
|
} |
|
963
|
|
|
if ($i - 15 >= 0 && $this->board[$i - 15][0] != $player) { |
|
964
|
|
|
return 0; |
|
965
|
|
|
} |
|
966
|
|
|
if ($i - 6 >= 0 && $this->board[$i - 6][0] != $player) { |
|
967
|
|
|
return 0; |
|
968
|
|
|
} |
|
969
|
|
|
if ($i + 10 <= 63 && $this->board[$i + 10][0] != $player) { |
|
970
|
|
|
return 0; |
|
971
|
|
|
} |
|
972
|
|
|
if ($i + 17 <= 63 && $this->board[$i + 17][0] != $player) { |
|
973
|
|
|
return 0; |
|
974
|
|
|
} |
|
975
|
|
|
if ($i + 15 <= 63 && $this->board[$i + 15][0] != $player) { |
|
976
|
|
|
return 0; |
|
977
|
|
|
} |
|
978
|
|
|
if ($i + 6 <= 63 && $this->board[$i + 6][0] != $player) { |
|
979
|
|
|
return 0; |
|
980
|
|
|
} |
|
981
|
|
|
if ($i - 10 >= 0 && $this->board[$i - 10][0] != $player) { |
|
982
|
|
|
return 0; |
|
983
|
|
|
} |
|
984
|
|
|
break; |
|
985
|
|
|
} |
|
986
|
|
|
} |
|
987
|
|
|
} |
|
988
|
|
|
|
|
989
|
|
|
return 1; |
|
990
|
|
|
} |
|
991
|
|
|
|
|
992
|
|
|
/** |
|
993
|
|
|
* Generate informational text message with parameters. |
|
994
|
|
|
* |
|
995
|
|
|
* Example: |
|
996
|
|
|
* <pre> |
|
997
|
|
|
* echo move_msg('cannot find {$param[1]} pawn in column {$param[2]}', 'b', 'e'); |
|
998
|
|
|
* - prints: "cannot find b pawn in column e" |
|
999
|
|
|
* </pre> |
|
1000
|
|
|
* |
|
1001
|
|
|
* @param string $text |
|
1002
|
|
|
* @return string |
|
1003
|
|
|
* |
|
1004
|
|
|
* @access private |
|
1005
|
|
|
*/ |
|
1006
|
|
|
public function move_msg($text) |
|
1007
|
|
|
{ |
|
1008
|
|
|
$param = \func_get_args(); |
|
1009
|
|
|
|
|
1010
|
|
|
#var_dump('move_msg, text', $text, 'param', $param);#*#DEBUG# |
|
1011
|
|
|
|
|
1012
|
|
|
return eval("return \"$text\";"); |
|
1013
|
|
|
} |
|
1014
|
|
|
|
|
1015
|
|
|
/** |
|
1016
|
|
|
* Translate Standard Algebraic Notation (SAN) into a full move description. |
|
1017
|
|
|
* |
|
1018
|
|
|
* The completed move is placed in $this->ac_move. |
|
1019
|
|
|
* |
|
1020
|
|
|
* @param string $player 'w' or 'b' |
|
1021
|
|
|
* @param string $move |
|
1022
|
|
|
* <pre> |
|
1023
|
|
|
* [a-h][1-8|a-h][RNBQK] pawn move/attack |
|
1024
|
|
|
* [PRNBQK][a-h][1-8] figure move |
|
1025
|
|
|
* [PRNBQK][:x][a-h][1-8] figure attack |
|
1026
|
|
|
* [PRNBQK][1-8|a-h][a-h][1-8] ambigous figure move |
|
1027
|
|
|
* [a-h][:x][a-h][1-8][[RNBQK] ambigous pawn attack |
|
1028
|
|
|
* [PRNBQK][1-8|a-h][:x][a-h][1-8] ambigous figure attack |
|
1029
|
|
|
* </pre> |
|
1030
|
|
|
* @return string Empty string if successful, otherwise error message |
|
1031
|
|
|
* |
|
1032
|
|
|
* @access private |
|
1033
|
|
|
*/ |
|
1034
|
|
|
public function completeMove($player, $move) |
|
1035
|
|
|
{ |
|
1036
|
|
|
/* |
|
1037
|
|
|
* [a-h][1-8|a-h][RNBQK] pawn move/attack |
|
1038
|
|
|
* [PRNBQK][a-h][1-8] figure move |
|
1039
|
|
|
* [PRNBQK][:x][a-h][1-8] figure attack |
|
1040
|
|
|
* [PRNBQK][1-8|a-h][a-h][1-8] ambigous figure move |
|
1041
|
|
|
* [a-h][:x][a-h][1-8][[RNBQK] ambigous pawn attack |
|
1042
|
|
|
* [PRNBQK][1-8|a-h][:x][a-h][1-8] ambigous figure attack |
|
1043
|
|
|
*/ |
|
1044
|
|
|
|
|
1045
|
|
|
$error = _MD_CHESS_MOVE_UNKNOWN; // "format is totally unknown!" |
|
1046
|
|
|
|
|
1047
|
|
|
$this->ac_move = $move; |
|
1048
|
|
|
|
|
1049
|
|
|
if (\mb_strlen($move) >= 6) { |
|
1050
|
|
|
/* full move: a pawn requires a ? in the end |
|
1051
|
|
|
* to automatically choose a queen on last line */ |
|
1052
|
|
|
|
|
1053
|
|
|
if (0 === \\strpos($move, 'P')) { |
|
|
|
|
|
|
1054
|
|
|
if ($move[\mb_strlen($move) - 1] < 'A' || $move[\mb_strlen($move) - 1] > 'Z') { |
|
1055
|
|
|
$this->ac_move = "$move?"; |
|
1056
|
|
|
} |
|
1057
|
|
|
} |
|
1058
|
|
|
|
|
1059
|
|
|
return ''; |
|
1060
|
|
|
} |
|
1061
|
|
|
|
|
1062
|
|
|
/* allow last letter to be a capital one indicating |
|
1063
|
|
|
* the chessmen a pawn is supposed to transform into, |
|
1064
|
|
|
* when entering the last file. we split this character |
|
1065
|
|
|
* to keep the autocompletion process the same. */ |
|
1066
|
|
|
|
|
1067
|
|
|
$pawn_upg = '?'; |
|
1068
|
|
|
|
|
1069
|
|
|
if ($move[\mb_strlen($move) - 1] >= 'A' && $move[\mb_strlen($move) - 1] <= 'Z') { |
|
1070
|
|
|
$pawn_upg = $move[\mb_strlen($move) - 1]; |
|
1071
|
|
|
|
|
1072
|
|
|
$move = \mb_substr($move, 0, -1); |
|
1073
|
|
|
} |
|
1074
|
|
|
|
|
1075
|
|
|
// remove trailing '=', if present |
|
1076
|
|
|
|
|
1077
|
|
|
if ('=' == $move[mb_strlen($move) - 1]) { |
|
1078
|
|
|
$move = \mb_substr($move, 0, -1); |
|
1079
|
|
|
} |
|
1080
|
|
|
|
|
1081
|
|
|
if ('P' == $pawn_upg || 'K' == $pawn_upg) { |
|
1082
|
|
|
return _MD_CHESS_MOVE_PAWN_MAY_BECOME; |
|
1083
|
|
|
} // "A pawn may only become either a knight, a bishop, a rook or a queen!" |
|
1084
|
|
|
|
|
1085
|
|
|
if ($move[0] >= 'a' && $move[0] <= 'h') { |
|
1086
|
|
|
/* pawn move. either it's 2 or for characters as |
|
1087
|
|
|
* listed above */ |
|
1088
|
|
|
|
|
1089
|
|
|
if (4 == mb_strlen($move)) { |
|
1090
|
|
|
if ('x' != $move[1]) { |
|
1091
|
|
|
return _MD_CHESS_MOVE_USE_X; |
|
1092
|
|
|
} // "use x to indicate an attack" |
|
1093
|
|
|
|
|
1094
|
|
|
$dest_x = $move[2]; |
|
1095
|
|
|
|
|
1096
|
|
|
$dest_y = $move[3]; |
|
1097
|
|
|
|
|
1098
|
|
|
$src_x = $move[0]; |
|
1099
|
|
|
|
|
1100
|
|
|
if ('w' == $player) { |
|
1101
|
|
|
$src_y = $dest_y - 1; |
|
1102
|
|
|
} else { |
|
1103
|
|
|
$src_y = $dest_y + 1; |
|
1104
|
|
|
} |
|
1105
|
|
|
|
|
1106
|
|
|
$this->ac_move = \sprintf( |
|
1107
|
|
|
'P%s%dx%s%d%s', |
|
1108
|
|
|
$src_x, |
|
1109
|
|
|
$src_y, |
|
1110
|
|
|
$dest_x, |
|
1111
|
|
|
$dest_y, |
|
1112
|
|
|
$pawn_upg |
|
1113
|
|
|
); |
|
1114
|
|
|
|
|
1115
|
|
|
return ''; |
|
1116
|
|
|
} elseif (2 == mb_strlen($move)) { |
|
1117
|
|
|
$fig = \sprintf('%sP', $player); |
|
1118
|
|
|
|
|
1119
|
|
|
if ($move[1] >= '1' && $move[1] <= '8') { |
|
1120
|
|
|
/* pawn move */ |
|
1121
|
|
|
|
|
1122
|
|
|
$pos = $this->boardCoordToIndex($move); |
|
1123
|
|
|
|
|
1124
|
|
|
if (64 == $pos) { |
|
1125
|
|
|
return $this->move_msg(_MD_CHESS_MOVE_COORD_INVALID, $move); |
|
1126
|
|
|
} // "coordinate $move is invalid" |
|
1127
|
|
|
|
|
1128
|
|
|
if ('w' == $player) { |
|
1129
|
|
|
while ($pos >= 0 && $this->board[$pos] != $fig) { |
|
1130
|
|
|
$pos -= 8; |
|
1131
|
|
|
} |
|
1132
|
|
|
|
|
1133
|
|
|
if ($pos < 0) { |
|
1134
|
|
|
$not_found = 1; |
|
1135
|
|
|
} |
|
1136
|
|
|
} else { |
|
1137
|
|
|
while ($pos <= 63 && $this->board[$pos] != $fig) { |
|
1138
|
|
|
$pos += 8; |
|
1139
|
|
|
} |
|
1140
|
|
|
|
|
1141
|
|
|
if ($pos > 63) { |
|
1142
|
|
|
$not_found = 1; |
|
1143
|
|
|
} |
|
1144
|
|
|
} |
|
1145
|
|
|
|
|
1146
|
|
|
$pos = $this->boardIndexToCoord($pos); |
|
1147
|
|
|
|
|
1148
|
|
|
if ((isset($not_found) && $not_found) || '' == $pos) { |
|
1149
|
|
|
return $this->move_msg(_MD_CHESS_MOVE_CANNOT_FIND_PAWN, $player, $move[0]); // "cannot find $player pawn in column $move[0]" |
|
1150
|
|
|
} |
|
1151
|
|
|
|
|
1152
|
|
|
$this->ac_move = \sprintf('P%s-%s%s', $pos, $move, $pawn_upg); |
|
1153
|
|
|
|
|
1154
|
|
|
return ''; |
|
1155
|
|
|
} |
|
1156
|
|
|
|
|
1157
|
|
|
/* notation: [a-h][a-h] for pawn attack no longer allowed |
|
1158
|
|
|
* except for history browser */ |
|
1159
|
|
|
|
|
1160
|
|
|
if (0 == $this->browsing_mode) { |
|
1161
|
|
|
return _MD_CHESS_MOVE_USE_NOTATION; |
|
1162
|
|
|
} // "please use denotation [a-h]x[a-h][1-8] for pawn attacks (see help for more information)" |
|
1163
|
|
|
|
|
1164
|
|
|
/* pawn attack must be only one pawn in column! */ |
|
1165
|
|
|
|
|
1166
|
|
|
$pawns = 0; |
|
1167
|
|
|
|
|
1168
|
|
|
$start = $this->boardCoordToIndex(\sprintf('%s1', $move[0])); |
|
1169
|
|
|
|
|
1170
|
|
|
if (64 == $start) { |
|
1171
|
|
|
return $this->move_msg(_MD_CHESS_MOVE_COORD_INVALID, $move[0]); |
|
1172
|
|
|
} // "coordinate $move[0] is invalid" |
|
1173
|
|
|
|
|
1174
|
|
|
for ($i = 1; $i <= 8; $i++, $start += 8) { |
|
1175
|
|
|
if ($this->board[$start] == $fig) { |
|
1176
|
|
|
$pawns++; |
|
1177
|
|
|
|
|
1178
|
|
|
$pawn_line = $i; |
|
1179
|
|
|
} |
|
1180
|
|
|
} |
|
1181
|
|
|
|
|
1182
|
|
|
if (0 == $pawns) { |
|
1183
|
|
|
return $this->move_msg(_MD_CHESS_MOVE_NO_PAWN, $move[0]); |
|
1184
|
|
|
} // "there is no pawn in column $move[0]" |
|
1185
|
|
|
|
|
1186
|
|
|
elseif ($pawns > 1) { |
|
1187
|
|
|
return $this->move_msg(_MD_CHESS_MOVE_TWO_PAWNS, $move[0]); |
|
1188
|
|
|
} // "there is more than one pawn in column $move[0]" |
|
1189
|
|
|
|
|
1190
|
|
|
if ('w' == $player) { |
|
1191
|
|
|
$dest_line = $pawn_line + 1; |
|
1192
|
|
|
} else { |
|
1193
|
|
|
$dest_line = $pawn_line - 1; |
|
1194
|
|
|
} |
|
1195
|
|
|
|
|
1196
|
|
|
$this->ac_move = \sprintf( |
|
1197
|
|
|
'P%s%dx%s%d', |
|
1198
|
|
|
$move[0], |
|
1199
|
|
|
$pawn_line, |
|
1200
|
|
|
$move[1], |
|
1201
|
|
|
$dest_line |
|
1202
|
|
|
); |
|
1203
|
|
|
|
|
1204
|
|
|
return ''; |
|
1205
|
|
|
} |
|
1206
|
|
|
} else { |
|
1207
|
|
|
/* figure move */ |
|
1208
|
|
|
|
|
1209
|
|
|
$dest_coord = \mb_substr($move, \mb_strlen($move) - 2, 2); |
|
1210
|
|
|
|
|
1211
|
|
|
$action = $move[\mb_strlen($move) - 3]; |
|
1212
|
|
|
|
|
1213
|
|
|
if ('x' != $action) { |
|
1214
|
|
|
$action = '-'; |
|
1215
|
|
|
} |
|
1216
|
|
|
|
|
1217
|
|
|
if ('w' == $player) { |
|
1218
|
|
|
$figures = $this->w_figures; |
|
1219
|
|
|
} else { |
|
1220
|
|
|
$figures = $this->b_figures; |
|
1221
|
|
|
} |
|
1222
|
|
|
|
|
1223
|
|
|
$fig_count = 0; |
|
1224
|
|
|
|
|
1225
|
|
|
foreach ($figures as $figure) { |
|
1226
|
|
|
if ($figure[0] == $move[0]) { |
|
1227
|
|
|
$fig_count++; |
|
1228
|
|
|
|
|
1229
|
|
|
if (1 == $fig_count) { |
|
1230
|
|
|
$pos1 = \mb_substr($figure, 1, 2); |
|
1231
|
|
|
} else { |
|
1232
|
|
|
$pos2 = \mb_substr($figure, 1, 2); |
|
1233
|
|
|
} |
|
1234
|
|
|
} |
|
1235
|
|
|
} |
|
1236
|
|
|
|
|
1237
|
|
|
if (0 == $fig_count) { |
|
1238
|
|
|
return $this->move_msg(_MD_CHESS_MOVE_NO_FIGURE, $move[0], $this->getFullFigureName($move[0])); |
|
1239
|
|
|
} // sprintf("there is no figure %s = %s", $move[0], $this->getFullFigureName($move[0])) |
|
1240
|
|
|
|
|
1241
|
|
|
elseif (1 == $fig_count) { |
|
1242
|
|
|
$this->ac_move = \sprintf( |
|
1243
|
|
|
'%s%s%s%s', |
|
1244
|
|
|
$move[0], |
|
1245
|
|
|
$pos1, |
|
1246
|
|
|
$action, |
|
1247
|
|
|
$dest_coord |
|
1248
|
|
|
); |
|
1249
|
|
|
|
|
1250
|
|
|
return ''; |
|
1251
|
|
|
} |
|
1252
|
|
|
|
|
1253
|
|
|
/* two figures which may cause ambiguity */ |
|
1254
|
|
|
|
|
1255
|
|
|
$dest_pos = $this->boardCoordToIndex($dest_coord); |
|
1256
|
|
|
|
|
1257
|
|
|
if (64 == $dest_pos) { |
|
1258
|
|
|
return $this->move_msg(_MD_CHESS_MOVE_COORD_INVALID, $dest_coord); |
|
1259
|
|
|
} // "coordinate $dest_coord is invalid" |
|
1260
|
|
|
|
|
1261
|
|
|
$fig1_can_reach = $this->tileIsReachable( |
|
1262
|
|
|
$move[0], |
|
1263
|
|
|
$this->boardCoordToIndex($pos1), |
|
1264
|
|
|
$dest_pos |
|
1265
|
|
|
); |
|
1266
|
|
|
|
|
1267
|
|
|
$fig2_can_reach = $this->tileIsReachable( |
|
1268
|
|
|
$move[0], |
|
1269
|
|
|
$this->boardCoordToIndex($pos2), |
|
1270
|
|
|
$dest_pos |
|
1271
|
|
|
); |
|
1272
|
|
|
|
|
1273
|
|
|
if (!$fig1_can_reach && !$fig2_can_reach) { |
|
1274
|
|
|
return $this->move_msg(_MD_CHESS_MOVE_NEITHER_CAN_REACH, $move[0], $this->getFullFigureName($move[0]), $dest_coord); |
|
1275
|
|
|
} // sprintf("neither of the %s = %s can reach %s", $move[0], $this->getFullFigureName($move[0]), $dest_coord) |
|
1276
|
|
|
|
|
1277
|
|
|
elseif ($fig1_can_reach && $fig2_can_reach) { |
|
1278
|
|
|
/* ambiguity - check whether a hint is given */ |
|
1279
|
|
|
|
|
1280
|
|
|
if (('-' == $action && 4 == mb_strlen($move)) |
|
1281
|
|
|
|| ('x' == $action && 5 == mb_strlen($move))) { |
|
1282
|
|
|
$hint = $move[1]; |
|
1283
|
|
|
} |
|
1284
|
|
|
|
|
1285
|
|
|
if (empty($hint)) { |
|
1286
|
|
|
return $this->move_msg(_MD_CHESS_MOVE_BOTH_CAN_REACH, $move[0], $this->getFullFigureName($move[0]), $dest_coord); |
|
1287
|
|
|
} // sprintf("both of the %s = %s can reach %s", $move[0], $this->getFullFigureName($move[0]), $dest_coord) |
|
1288
|
|
|
|
|
1289
|
|
|
$move_fig1 = 0; |
|
1290
|
|
|
|
|
1291
|
|
|
$move_fig2 = 0; |
|
1292
|
|
|
|
|
1293
|
|
|
if ($hint >= '1' && $hint <= '8') { |
|
1294
|
|
|
if ($pos1[1] == $hint && $pos2[1] != $hint) { |
|
1295
|
|
|
$move_fig1 = 1; |
|
1296
|
|
|
} |
|
1297
|
|
|
|
|
1298
|
|
|
if ($pos2[1] == $hint && $pos1[1] != $hint) { |
|
1299
|
|
|
$move_fig2 = 1; |
|
1300
|
|
|
} |
|
1301
|
|
|
} else { |
|
1302
|
|
|
if ($pos1[0] == $hint && $pos2[0] != $hint) { |
|
1303
|
|
|
$move_fig1 = 1; |
|
1304
|
|
|
} |
|
1305
|
|
|
|
|
1306
|
|
|
if ($pos2[0] == $hint && $pos1[0] != $hint) { |
|
1307
|
|
|
$move_fig2 = 1; |
|
1308
|
|
|
} |
|
1309
|
|
|
} |
|
1310
|
|
|
|
|
1311
|
|
|
if (!$move_fig1 && !$move_fig2) { |
|
1312
|
|
|
return _MD_CHESS_MOVE_AMBIGUOUS; |
|
1313
|
|
|
} // "ambiguity is not properly resolved" |
|
1314
|
|
|
|
|
1315
|
|
|
if ($move_fig1) { |
|
1316
|
|
|
$this->ac_move = \sprintf( |
|
1317
|
|
|
'%s%s%s%s', |
|
1318
|
|
|
$move[0], |
|
1319
|
|
|
$pos1, |
|
1320
|
|
|
$action, |
|
1321
|
|
|
$dest_coord |
|
1322
|
|
|
); |
|
1323
|
|
|
} else { |
|
1324
|
|
|
$this->ac_move = \sprintf( |
|
1325
|
|
|
'%s%s%s%s', |
|
1326
|
|
|
$move[0], |
|
1327
|
|
|
$pos2, |
|
1328
|
|
|
$action, |
|
1329
|
|
|
$dest_coord |
|
1330
|
|
|
); |
|
1331
|
|
|
} |
|
1332
|
|
|
|
|
1333
|
|
|
return; |
|
1334
|
|
|
} |
|
1335
|
|
|
|
|
1336
|
|
|
if ($fig1_can_reach) { |
|
1337
|
|
|
$this->ac_move = \sprintf( |
|
1338
|
|
|
'%s%s%s%s', |
|
1339
|
|
|
$move[0], |
|
1340
|
|
|
$pos1, |
|
1341
|
|
|
$action, |
|
1342
|
|
|
$dest_coord |
|
1343
|
|
|
); |
|
1344
|
|
|
} else { |
|
1345
|
|
|
$this->ac_move = \sprintf( |
|
1346
|
|
|
'%s%s%s%s', |
|
1347
|
|
|
$move[0], |
|
1348
|
|
|
$pos2, |
|
1349
|
|
|
$action, |
|
1350
|
|
|
$dest_coord |
|
1351
|
|
|
); |
|
1352
|
|
|
} |
|
1353
|
|
|
|
|
1354
|
|
|
return ''; |
|
1355
|
|
|
} |
|
1356
|
|
|
|
|
1357
|
|
|
return $error; |
|
1358
|
|
|
} |
|
1359
|
|
|
|
|
1360
|
|
|
/** |
|
1361
|
|
|
* A hacky function that uses autocomplete to short |
|
1362
|
|
|
* a full move. if this fails there is no warning |
|
1363
|
|
|
* but the move is kept unchanged. |
|
1364
|
|
|
* |
|
1365
|
|
|
* @param string $player 'w' or 'b' |
|
1366
|
|
|
* @param string $move |
|
1367
|
|
|
* @return string new move |
|
1368
|
|
|
* |
|
1369
|
|
|
* @access private |
|
1370
|
|
|
*/ |
|
1371
|
|
|
public function convertFullToChessNotation($player, $move) |
|
1372
|
|
|
{ |
|
1373
|
|
|
$new_move = $move; |
|
1374
|
|
|
|
|
1375
|
|
|
$old_ac_move = $this->ac_move; /* backup required as autocomplete |
|
1376
|
|
|
will overwrite it */ |
|
1377
|
|
|
|
|
1378
|
|
|
/* valid pawn moves are always non-ambigious */ |
|
1379
|
|
|
|
|
1380
|
|
|
if (0 === \\strpos($move, 'P')) { |
|
1381
|
|
|
/* skip P anycase. for attacks skip source digit |
|
1382
|
|
|
and for moves skip source pos and - */ |
|
1383
|
|
|
|
|
1384
|
|
|
if ('-' == $move[3]) { |
|
1385
|
|
|
$new_move = \mb_substr($move, 4); |
|
1386
|
|
|
} elseif ('x' == $move[3]) { |
|
1387
|
|
|
$new_move = \sprintf('%s%s', $move[1], \mb_substr($move, 3)); |
|
1388
|
|
|
} |
|
1389
|
|
|
} else { |
|
1390
|
|
|
/* try to remove the source position and check whether it |
|
1391
|
|
|
* is a non-ambigious move. if it is add one of the components |
|
1392
|
|
|
* and check again */ |
|
1393
|
|
|
|
|
1394
|
|
|
if ('-' == $move[3]) { |
|
1395
|
|
|
$dest = \mb_substr($move, 4); |
|
1396
|
|
|
} elseif ('x' == $move[3]) { |
|
1397
|
|
|
$dest = \mb_substr($move, 3); |
|
1398
|
|
|
} |
|
1399
|
|
|
|
|
1400
|
|
|
$new_move = \sprintf('%s%s', $move[0], $dest); |
|
1401
|
|
|
|
|
1402
|
|
|
if ('' != $this->completeMove($player, $new_move)) { |
|
1403
|
|
|
/* add a component */ |
|
1404
|
|
|
|
|
1405
|
|
|
$new_move = \sprintf('%s%s%s', $move[0], $move[1], $dest); |
|
1406
|
|
|
|
|
1407
|
|
|
if ('' != $this->completeMove($player, $new_move)) { |
|
1408
|
|
|
/* add other component */ |
|
1409
|
|
|
|
|
1410
|
|
|
$new_move = \sprintf('%s%s%s', $move[0], $move[2], $dest); |
|
1411
|
|
|
|
|
1412
|
|
|
if ('' != $this->completeMove($player, $new_move)) { |
|
1413
|
|
|
$new_move = $move; |
|
1414
|
|
|
} /* give up */ |
|
1415
|
|
|
} |
|
1416
|
|
|
} |
|
1417
|
|
|
} |
|
1418
|
|
|
|
|
1419
|
|
|
$this->ac_move = $old_ac_move; |
|
1420
|
|
|
|
|
1421
|
|
|
return $new_move; |
|
1422
|
|
|
} |
|
1423
|
|
|
|
|
1424
|
|
|
/** |
|
1425
|
|
|
* Handle a move. |
|
1426
|
|
|
* |
|
1427
|
|
|
* check whether it is user's turn and the move is valid. |
|
1428
|
|
|
* if the move is okay update the game file. |
|
1429
|
|
|
* |
|
1430
|
|
|
* @param string $move |
|
1431
|
|
|
* @return array A two-element array: |
|
1432
|
|
|
* - $move_performed: true if the move was performed and the game state has been updated, false otherwise |
|
1433
|
|
|
* - $move_result_text: text message |
|
1434
|
|
|
* |
|
1435
|
|
|
* @access private |
|
1436
|
|
|
*/ |
|
1437
|
|
|
public function handleMove($move) |
|
1438
|
|
|
{ |
|
1439
|
|
|
/* DEBUG: echo "HANDLE: $move, $comment<br>"; */ |
|
1440
|
|
|
|
|
1441
|
|
|
$result = _MD_CHESS_MOVE_UNDEFINED; |
|
1442
|
|
|
|
|
1443
|
|
|
$move_handled = 0; |
|
1444
|
|
|
|
|
1445
|
|
|
// Use $this->gamestate['fen_piece_placement'] to initialize $this->board, $this->w_figures and $this->b_figures. |
|
1446
|
|
|
|
|
1447
|
|
|
$this->fen_piece_placement_to_board() || \trigger_error('handleMove, piece_placement invalid', \E_USER_ERROR); |
|
1448
|
|
|
|
|
1449
|
|
|
// get color of current player |
|
1450
|
|
|
|
|
1451
|
|
|
$cur_player = $this->gamestate['fen_active_color']; /* b or w */ |
|
1452
|
|
|
|
|
1453
|
|
|
if ('w' != $cur_player && 'b' != $cur_player) { |
|
1454
|
|
|
return [false, "handleMove, internal error: player='$cur_player'"]; |
|
1455
|
|
|
} |
|
1456
|
|
|
|
|
1457
|
|
|
$cur_opp = 'w' == $cur_player ? 'b' : 'w'; |
|
1458
|
|
|
|
|
1459
|
|
|
if ('*' != $this->gamestate['pgn_result']) { |
|
1460
|
|
|
return [false, _MD_CHESS_MOVE_GAME_OVER]; |
|
1461
|
|
|
} |
|
1462
|
|
|
|
|
1463
|
|
|
// get castling availability flags |
|
1464
|
|
|
|
|
1465
|
|
|
$white_may_castle_short = \mb_strstr($this->gamestate['fen_castling_availability'], 'K') ? true : false; |
|
1466
|
|
|
|
|
1467
|
|
|
$white_may_castle_long = \mb_strstr($this->gamestate['fen_castling_availability'], 'Q') ? true : false; |
|
1468
|
|
|
|
|
1469
|
|
|
$black_may_castle_short = \mb_strstr($this->gamestate['fen_castling_availability'], 'k') ? true : false; |
|
1470
|
|
|
|
|
1471
|
|
|
$black_may_castle_long = \mb_strstr($this->gamestate['fen_castling_availability'], 'q') ? true : false; |
|
1472
|
|
|
|
|
1473
|
|
|
// Castling is supposed to use ohs, not zeros. Allow zeros on input anyway. |
|
1474
|
|
|
|
|
1475
|
|
|
if ('0-0' == $move) { |
|
1476
|
|
|
$move = 'O-O'; |
|
1477
|
|
|
} elseif ('0-0-0' == $move) { |
|
1478
|
|
|
$move = 'O-O-O'; |
|
1479
|
|
|
} |
|
1480
|
|
|
|
|
1481
|
|
|
// allow two-step of king to indicate castling |
|
1482
|
|
|
|
|
1483
|
|
|
if ('w' == $cur_player && 'Ke1-g1' == $move) { |
|
1484
|
|
|
$move = 'O-O'; |
|
1485
|
|
|
} elseif ('w' == $cur_player && 'Ke1-c1' == $move) { |
|
1486
|
|
|
$move = 'O-O-O'; |
|
1487
|
|
|
} elseif ('b' == $cur_player && 'Ke8-g8' == $move) { |
|
1488
|
|
|
$move = 'O-O'; |
|
1489
|
|
|
} elseif ('b' == $cur_player && 'Ke8-c8' == $move) { |
|
1490
|
|
|
$move = 'O-O-O'; |
|
1491
|
|
|
} |
|
1492
|
|
|
|
|
1493
|
|
|
/* backup full move input for game history before |
|
1494
|
|
|
* splitting figure type apart */ |
|
1495
|
|
|
|
|
1496
|
|
|
$history_move = $move; |
|
1497
|
|
|
|
|
1498
|
|
|
/* clear last move - won't be saved yet if anything |
|
1499
|
|
|
goes wrong */ |
|
1500
|
|
|
|
|
1501
|
|
|
$this->last_move = 'x'; |
|
1502
|
|
|
|
|
1503
|
|
|
$this->piece_captured = 'x'; |
|
1504
|
|
|
|
|
1505
|
|
|
/* HANDLE MOVES: |
|
1506
|
|
|
* --- surrender |
|
1507
|
|
|
* O-O short castling |
|
1508
|
|
|
* O-O-O long castling |
|
1509
|
|
|
* [PRNBQK][a-h][1-8][-:x][a-h][1-8] unshortened move |
|
1510
|
|
|
*/ |
|
1511
|
|
|
|
|
1512
|
|
|
if ('O-O' == $move) { |
|
1513
|
|
|
/* short castling */ |
|
1514
|
|
|
|
|
1515
|
|
|
if ('b' == $cur_player) { |
|
1516
|
|
|
if (!$black_may_castle_short) { |
|
1517
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // You cannot castle short any longer! |
|
1518
|
|
|
} |
|
1519
|
|
|
|
|
1520
|
|
|
if (!$this->is_empty_tile(61) || !$this->is_empty_tile(62)) { |
|
1521
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // Cannot castle short because the way is blocked! |
|
1522
|
|
|
} |
|
1523
|
|
|
|
|
1524
|
|
|
if ($this->kingIsUnderAttack('b', 'w')) { |
|
1525
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // You cannot escape check by castling! |
|
1526
|
|
|
} |
|
1527
|
|
|
|
|
1528
|
|
|
if ($this->tileIsUnderAttack('w', 62) || $this->tileIsUnderAttack('w', 61)) { |
|
1529
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // A tile the king passes over or into would be under attack after short castling! |
|
1530
|
|
|
} |
|
1531
|
|
|
|
|
1532
|
|
|
$this->clear_tile(60); |
|
1533
|
|
|
|
|
1534
|
|
|
$this->board[62] = 'bK'; |
|
1535
|
|
|
|
|
1536
|
|
|
$this->board[61] = 'bR'; |
|
1537
|
|
|
|
|
1538
|
|
|
$this->clear_tile(63); |
|
1539
|
|
|
|
|
1540
|
|
|
$black_may_castle_short = false; |
|
1541
|
|
|
|
|
1542
|
|
|
$black_may_castle_long = false; |
|
1543
|
|
|
} else { |
|
1544
|
|
|
if (!$white_may_castle_short) { |
|
1545
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // You cannot castle short any longer! |
|
1546
|
|
|
} |
|
1547
|
|
|
|
|
1548
|
|
|
if (!$this->is_empty_tile(5) || !$this->is_empty_tile(6)) { |
|
1549
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // Cannot castle short because the way is blocked! |
|
1550
|
|
|
} |
|
1551
|
|
|
|
|
1552
|
|
|
if ($this->kingIsUnderAttack('w', 'b')) { |
|
1553
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // You cannot escape check by castling! |
|
1554
|
|
|
} |
|
1555
|
|
|
|
|
1556
|
|
|
if ($this->tileIsUnderAttack('b', 5) || $this->tileIsUnderAttack('b', 6)) { |
|
1557
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // A tile the king passes over or into would be under attack after short castling! |
|
1558
|
|
|
} |
|
1559
|
|
|
|
|
1560
|
|
|
$this->clear_tile(4); |
|
1561
|
|
|
|
|
1562
|
|
|
$this->board[6] = 'wK'; |
|
1563
|
|
|
|
|
1564
|
|
|
$this->board[5] = 'wR'; |
|
1565
|
|
|
|
|
1566
|
|
|
$this->clear_tile(7); |
|
1567
|
|
|
|
|
1568
|
|
|
$white_may_castle_short = false; |
|
1569
|
|
|
|
|
1570
|
|
|
$white_may_castle_long = false; |
|
1571
|
|
|
} |
|
1572
|
|
|
|
|
1573
|
|
|
$result = _MD_CHESS_MOVE_CASTLED_SHORT; |
|
1574
|
|
|
|
|
1575
|
|
|
$move_handled = 1; |
|
1576
|
|
|
|
|
1577
|
|
|
$this->last_move = 'O-O'; |
|
1578
|
|
|
} elseif ('O-O-O' == $move) { |
|
1579
|
|
|
/* long castling */ |
|
1580
|
|
|
|
|
1581
|
|
|
if ('b' == $cur_player) { |
|
1582
|
|
|
if (!$black_may_castle_long) { |
|
1583
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // You cannot castle long any longer! |
|
1584
|
|
|
} |
|
1585
|
|
|
|
|
1586
|
|
|
if (!$this->is_empty_tile(57) || !$this->is_empty_tile(58) || !$this->is_empty_tile(59)) { |
|
1587
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // Cannot castle long because the way is blocked! |
|
1588
|
|
|
} |
|
1589
|
|
|
|
|
1590
|
|
|
if ($this->kingIsUnderAttack('b', 'w')) { |
|
1591
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // You cannot escape check by castling! |
|
1592
|
|
|
} |
|
1593
|
|
|
|
|
1594
|
|
|
if ($this->tileIsUnderAttack('w', 58) || $this->tileIsUnderAttack('w', 59)) { |
|
1595
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // A tile the king passes over or into would be under attack after short castling! |
|
1596
|
|
|
} |
|
1597
|
|
|
|
|
1598
|
|
|
$this->clear_tile(56); |
|
1599
|
|
|
|
|
1600
|
|
|
$this->board[58] = 'bK'; |
|
1601
|
|
|
|
|
1602
|
|
|
$this->board[59] = 'bR'; |
|
1603
|
|
|
|
|
1604
|
|
|
$this->clear_tile(60); |
|
1605
|
|
|
|
|
1606
|
|
|
$black_may_castle_short = false; |
|
1607
|
|
|
|
|
1608
|
|
|
$black_may_castle_long = false; |
|
1609
|
|
|
} else { |
|
1610
|
|
|
if (!$white_may_castle_long) { |
|
1611
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // You cannot castle long any longer! |
|
1612
|
|
|
} |
|
1613
|
|
|
|
|
1614
|
|
|
if (!$this->is_empty_tile(1) || !$this->is_empty_tile(2) || !$this->is_empty_tile(3)) { |
|
1615
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // Cannot castle long because the way is blocked! |
|
1616
|
|
|
} |
|
1617
|
|
|
|
|
1618
|
|
|
if ($this->kingIsUnderAttack('w', 'b')) { |
|
1619
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // You cannot escape check by castling! |
|
1620
|
|
|
} |
|
1621
|
|
|
|
|
1622
|
|
|
if ($this->tileIsUnderAttack('b', 2) || $this->tileIsUnderAttack('b', 3)) { |
|
1623
|
|
|
return [false, _MD_CHESS_MOVE_NO_CASTLE]; // A tile the king passes over or into would be under attack after short castling! |
|
1624
|
|
|
} |
|
1625
|
|
|
|
|
1626
|
|
|
$this->clear_tile(0); |
|
1627
|
|
|
|
|
1628
|
|
|
$this->board[2] = 'wK'; |
|
1629
|
|
|
|
|
1630
|
|
|
$this->board[3] = 'wR'; |
|
1631
|
|
|
|
|
1632
|
|
|
$this->clear_tile(4); |
|
1633
|
|
|
|
|
1634
|
|
|
$white_may_castle_short = false; |
|
1635
|
|
|
|
|
1636
|
|
|
$white_may_castle_long = false; |
|
1637
|
|
|
} |
|
1638
|
|
|
|
|
1639
|
|
|
$result = _MD_CHESS_MOVE_CASTLED_LONG; |
|
1640
|
|
|
|
|
1641
|
|
|
$move_handled = 1; |
|
1642
|
|
|
|
|
1643
|
|
|
$this->last_move = 'O-O-O'; |
|
1644
|
|
|
} else { |
|
1645
|
|
|
/* [PRNBQK][a-h][1-8][-:x][a-h][1-8][RNBQK] full move */ |
|
1646
|
|
|
|
|
1647
|
|
|
/* allow short move description by autocompleting to |
|
1648
|
|
|
* full description */ |
|
1649
|
|
|
|
|
1650
|
|
|
$ac_error = $this->completeMove($cur_player, \trim($move)); |
|
1651
|
|
|
|
|
1652
|
|
|
if ('' != $ac_error) { |
|
1653
|
|
|
return [false, $ac_error]; |
|
1654
|
|
|
} // "ERROR: autocomplete: $ac_error" |
|
1655
|
|
|
|
|
1656
|
|
|
$move = $this->ac_move; |
|
1657
|
|
|
|
|
1658
|
|
|
$this->last_move = \str_replace('?', '', $move); |
|
1659
|
|
|
|
|
1660
|
|
|
/* a final captial letter may only be N,B,R,Q for the |
|
1661
|
|
|
* appropiate chessman */ |
|
1662
|
|
|
|
|
1663
|
|
|
$c = $move[\mb_strlen($move) - 1]; |
|
1664
|
|
|
|
|
1665
|
|
|
if ($c >= 'A' && $c <= 'Z') { |
|
1666
|
|
|
if ('N' != $c && 'B' != $c && 'R' != $c && 'Q' != $c) { |
|
1667
|
|
|
return [false, _MD_CHESS_MOVE_INVALID_PIECE]; |
|
1668
|
|
|
} |
|
1669
|
|
|
} // "ERROR: only N (knight), B (bishop), R (rook) and Q (queen) are valid chessman identifiers" |
|
1670
|
|
|
|
|
1671
|
|
|
/* if it is a full move, try to shorten the history move */ |
|
1672
|
|
|
|
|
1673
|
|
|
if (\mb_strlen($history_move) >= 6) { |
|
1674
|
|
|
$history_move = $this->convertFullToChessNotation($cur_player, $history_move); |
|
1675
|
|
|
} |
|
1676
|
|
|
|
|
1677
|
|
|
/* DEBUG: echo "Move: $move ($history_move)<br>"; */ |
|
1678
|
|
|
|
|
1679
|
|
|
/* validate figure and position */ |
|
1680
|
|
|
|
|
1681
|
|
|
$fig_type = $move[0]; |
|
1682
|
|
|
|
|
1683
|
|
|
$fig_name = $this->getFullFigureName($fig_type); |
|
1684
|
|
|
|
|
1685
|
|
|
if ('empty' == $fig_name) { |
|
1686
|
|
|
return [false, $this->move_msg(_MD_CHESS_MOVE_UNKNOWN_FIGURE, $fig_type)]; |
|
1687
|
|
|
} // "ERROR: Figure $fig_type is unknown!" |
|
1688
|
|
|
|
|
1689
|
|
|
$fig_coord = \mb_substr($move, 1, 2); |
|
1690
|
|
|
|
|
1691
|
|
|
$fig_pos = $this->boardCoordToIndex($fig_coord); |
|
1692
|
|
|
|
|
1693
|
|
|
if (64 == $fig_pos) { |
|
1694
|
|
|
return [false, $this->move_msg(_MD_CHESS_MOVE_COORD_INVALID, $fig_coord)]; |
|
1695
|
|
|
} // "ERROR: $fig_coord is invalid!" |
|
1696
|
|
|
|
|
1697
|
|
|
/* DEBUG echo "fig_type: $fig_type, fig_pos: $fig_pos<br>"; */ |
|
1698
|
|
|
|
|
1699
|
|
|
if ($this->is_empty_tile($fig_pos)) { |
|
1700
|
|
|
return [false, $this->move_msg(_MD_CHESS_MOVE_TILE_EMPTY, $fig_coord)]; |
|
1701
|
|
|
} // "ERROR: Tile $fig_coord is empty." |
|
1702
|
|
|
|
|
1703
|
|
|
if ($this->board[$fig_pos][0] != $cur_player) { |
|
1704
|
|
|
return [false, _MD_CHESS_MOVE_NOT_YOUR_PIECE]; |
|
1705
|
|
|
} // "ERROR: Figure does not belong to you!" |
|
1706
|
|
|
|
|
1707
|
|
|
if ($this->board[$fig_pos][1] != $fig_type) { |
|
1708
|
|
|
return [false, _MD_CHESS_MOVE_NOEXIST_FIGURE]; |
|
1709
|
|
|
} // "ERROR: Figure does not exist!" |
|
1710
|
|
|
|
|
1711
|
|
|
/* get target index */ |
|
1712
|
|
|
|
|
1713
|
|
|
$dest_coord = \mb_substr($move, 4, 2); |
|
1714
|
|
|
|
|
1715
|
|
|
$dest_pos = $this->boardCoordToIndex($dest_coord); |
|
1716
|
|
|
|
|
1717
|
|
|
if (64 == $dest_pos) { |
|
1718
|
|
|
return [false, $this->move_msg(_MD_CHESS_MOVE_COORD_INVALID, $dest_coord)]; |
|
1719
|
|
|
} // "ERROR: $dest_coord is invalid!" |
|
1720
|
|
|
|
|
1721
|
|
|
if ($dest_pos == $fig_pos) { |
|
1722
|
|
|
return [false, _MD_CHESS_MOVE_START_END_SAME]; |
|
1723
|
|
|
} |
|
1724
|
|
|
|
|
1725
|
|
|
/* DEBUG echo "dest_pos: $dest_pos<br>"; */ |
|
1726
|
|
|
|
|
1727
|
|
|
/* get action */ |
|
1728
|
|
|
|
|
1729
|
|
|
$action = $move[3]; |
|
1730
|
|
|
|
|
1731
|
|
|
if ('-' == $move[3]) { |
|
1732
|
|
|
$action = 'M'; |
|
1733
|
|
|
} /* move */ |
|
1734
|
|
|
|
|
1735
|
|
|
elseif ('x' == $move[3]) { |
|
1736
|
|
|
$action = 'A'; |
|
1737
|
|
|
} /* attack */ |
|
1738
|
|
|
|
|
1739
|
|
|
else { |
|
1740
|
|
|
return [false, $this->move_msg(_MD_CHESS_MOVE_UNKNOWN_ACTION, $action)]; |
|
1741
|
|
|
} // "ERROR: $action is unknown! Please use \"-\" for a move and \"x\" for an attack." |
|
1742
|
|
|
|
|
1743
|
|
|
/* if attack an enemy unit must be present on tile |
|
1744
|
|
|
* and if move then tile must be empty. in both cases |
|
1745
|
|
|
* the king must not be checked after moving. */ |
|
1746
|
|
|
|
|
1747
|
|
|
/* check whether the move is along a valid path and |
|
1748
|
|
|
* whether all tiles in between are empty thus the path |
|
1749
|
|
|
* is not blocked. the final destination tile is not |
|
1750
|
|
|
* checked here. */ |
|
1751
|
|
|
|
|
1752
|
|
|
if ('P' != $fig_type) { |
|
1753
|
|
|
if (!$this->tileIsReachable($fig_type, $fig_pos, $dest_pos)) { |
|
1754
|
|
|
return [false, $this->move_msg(_MD_CHESS_MOVE_OUT_OF_RANGE, $dest_coord, $fig_name, $fig_coord)]; |
|
1755
|
|
|
} // "ERROR: Tile $dest_coord is out of moving range for $fig_name at $fig_coord!" |
|
1756
|
|
|
} else { |
|
1757
|
|
|
if ('M' == $action && !$this->checkPawnMove($fig_pos, $dest_pos)) { |
|
1758
|
|
|
return [false, $this->move_msg(_MD_CHESS_MOVE_OUT_OF_RANGE, $dest_coord, $fig_name, $fig_coord)]; |
|
1759
|
|
|
} // "ERROR: Tile $dest_coord is out of moving range for $fig_name at $fig_coord!" |
|
1760
|
|
|
|
|
1761
|
|
|
if ('A' == $action && !$this->checkPawnAttack($fig_pos, $dest_pos)) { |
|
1762
|
|
|
return [false, $this->move_msg(_MD_CHESS_MOVE_OUT_OF_RANGE, $dest_coord, $fig_name, $fig_coord)]; |
|
1763
|
|
|
} // "ERROR: Tile $dest_coord is out of attacking range for $fig_name at $fig_coord!" |
|
1764
|
|
|
} |
|
1765
|
|
|
|
|
1766
|
|
|
$en_passant_capture_performed = 0; // 1 if en passant captured occurred, else 0 |
|
1767
|
|
|
|
|
1768
|
|
|
/* check action */ |
|
1769
|
|
|
|
|
1770
|
|
|
if ('M' == $action && !$this->is_empty_tile($dest_pos)) { |
|
1771
|
|
|
return [false, $this->move_msg(_MD_CHESS_MOVE_OCCUPIED, $dest_coord)]; // "ERROR: Tile $dest_coord is occupied. You cannot move there." |
|
1772
|
|
|
} |
|
1773
|
|
|
|
|
1774
|
|
|
if ('A' == $action && $this->is_empty_tile($dest_pos)) { |
|
1775
|
|
|
/* en passant of pawn? */ |
|
1776
|
|
|
|
|
1777
|
|
|
if ('P' == $fig_type) { |
|
1778
|
|
|
if ($this->boardIndexToCoord($dest_pos) == $this->gamestate['fen_en_passant_target_square']) { |
|
1779
|
|
|
$en_passant_capture_performed = 1; |
|
1780
|
|
|
} |
|
1781
|
|
|
|
|
1782
|
|
|
if (0 == $en_passant_capture_performed) { |
|
1783
|
|
|
return [false, _MD_CHESS_MOVE_NO_EN_PASSANT]; // "ERROR: en-passant no longer possible!" |
|
1784
|
|
|
} |
|
1785
|
|
|
} else { |
|
1786
|
|
|
return [false, $this->move_msg(_MD_CHESS_MOVE_ATTACK_EMPTY, $dest_coord)]; // "ERROR: Tile $dest_coord is empty. You cannot attack it." |
|
1787
|
|
|
} |
|
1788
|
|
|
} |
|
1789
|
|
|
|
|
1790
|
|
|
if ('A' == $action && $this->board[$dest_pos][0] == $cur_player) { |
|
1791
|
|
|
return [false, $this->move_msg(_MD_CHESS_MOVE_ATTACK_SELF, $dest_coord)]; // "ERROR: You cannot attack own unit at $dest_coord." |
|
1792
|
|
|
} |
|
1793
|
|
|
|
|
1794
|
|
|
/* backup affected tiles */ |
|
1795
|
|
|
|
|
1796
|
|
|
$old_fig_tile = $this->board[$fig_pos]; |
|
1797
|
|
|
|
|
1798
|
|
|
$old_dest_tile = $this->board[$dest_pos]; |
|
1799
|
|
|
|
|
1800
|
|
|
/* perform move */ |
|
1801
|
|
|
|
|
1802
|
|
|
$this->clear_tile($fig_pos); |
|
1803
|
|
|
|
|
1804
|
|
|
if (!$this->is_empty_tile($dest_pos)) { |
|
1805
|
|
|
$this->piece_captured = \sprintf('%s%s', $this->board[$dest_pos], $dest_pos); |
|
1806
|
|
|
} |
|
1807
|
|
|
|
|
1808
|
|
|
$this->board[$dest_pos] = "$cur_player$fig_type"; |
|
1809
|
|
|
|
|
1810
|
|
|
if ($en_passant_capture_performed) { |
|
1811
|
|
|
/* kill pawn */ |
|
1812
|
|
|
|
|
1813
|
|
|
if ('w' == $cur_player) { |
|
1814
|
|
|
$this->clear_tile($dest_pos - 8); |
|
1815
|
|
|
|
|
1816
|
|
|
$this->piece_captured = \sprintf('bP%s', $dest_pos - 8); |
|
1817
|
|
|
} else { |
|
1818
|
|
|
$this->clear_tile($dest_pos + 8); |
|
1819
|
|
|
|
|
1820
|
|
|
$this->piece_captured = \sprintf('wP%s', $dest_pos + 8); |
|
1821
|
|
|
} |
|
1822
|
|
|
} |
|
1823
|
|
|
|
|
1824
|
|
|
/* check check :) */ |
|
1825
|
|
|
|
|
1826
|
|
|
if ($this->kingIsUnderAttack($cur_player, $cur_opp)) { |
|
1827
|
|
|
$this->board[$fig_pos] = $old_fig_tile; |
|
1828
|
|
|
|
|
1829
|
|
|
$this->board[$dest_pos] = $old_dest_tile; |
|
1830
|
|
|
|
|
1831
|
|
|
if ($en_passant_capture_performed) { |
|
1832
|
|
|
// restore pawn that was captured above, since that move is invalid |
|
1833
|
|
|
|
|
1834
|
|
|
if ('w' == $cur_player) { |
|
1835
|
|
|
$this->board[$dest_pos - 8] = 'bP'; |
|
1836
|
|
|
} else { |
|
1837
|
|
|
$this->board[$dest_pos + 8] = 'wP'; |
|
1838
|
|
|
} |
|
1839
|
|
|
} |
|
1840
|
|
|
|
|
1841
|
|
|
return [false, _MD_CHESS_MOVE_IN_CHECK]; // "ERROR: Move is invalid because king would be under attack then." |
|
1842
|
|
|
} |
|
1843
|
|
|
|
|
1844
|
|
|
// check whether this forbids any castling |
|
1845
|
|
|
|
|
1846
|
|
|
if ('K' == $fig_type) { |
|
1847
|
|
|
if ('w' == $cur_player) { |
|
1848
|
|
|
$white_may_castle_short = false; |
|
1849
|
|
|
|
|
1850
|
|
|
$white_may_castle_long = false; |
|
1851
|
|
|
} else { |
|
1852
|
|
|
$black_may_castle_short = false; |
|
1853
|
|
|
|
|
1854
|
|
|
$black_may_castle_long = false; |
|
1855
|
|
|
} |
|
1856
|
|
|
} |
|
1857
|
|
|
|
|
1858
|
|
|
if ('R' == $fig_type) { |
|
1859
|
|
|
if ('w' == $cur_player) { |
|
1860
|
|
|
if (7 == $fig_pos) { |
|
1861
|
|
|
$white_may_castle_short = false; |
|
1862
|
|
|
} elseif (0 == $fig_pos) { |
|
1863
|
|
|
$white_may_castle_long = false; |
|
1864
|
|
|
} |
|
1865
|
|
|
} else { |
|
1866
|
|
|
if (63 == $fig_pos) { |
|
1867
|
|
|
$black_may_castle_short = false; |
|
1868
|
|
|
} elseif (56 == $fig_pos) { |
|
1869
|
|
|
$black_may_castle_long = false; |
|
1870
|
|
|
} |
|
1871
|
|
|
} |
|
1872
|
|
|
} |
|
1873
|
|
|
|
|
1874
|
|
|
// if a pawn moved two tiles, this will allow 'en passant' on next move |
|
1875
|
|
|
|
|
1876
|
|
|
if ('P' == $fig_type && 16 == \abs($fig_pos - $dest_pos)) { |
|
1877
|
|
|
$file_chars = 'abcdefgh'; |
|
1878
|
|
|
|
|
1879
|
|
|
$this->gamestate['fen_en_passant_target_square'] = $file_chars[$fig_pos % 8] . ('w' == $cur_player ? '3' : '6'); |
|
1880
|
|
|
} else { |
|
1881
|
|
|
// clear 'en passant' |
|
1882
|
|
|
|
|
1883
|
|
|
$this->gamestate['fen_en_passant_target_square'] = '-'; |
|
1884
|
|
|
} |
|
1885
|
|
|
|
|
1886
|
|
|
if ('M' == $action) { |
|
1887
|
|
|
$result = $this->move_msg(_MD_CHESS_MOVE_MOVED, $fig_name, $fig_coord, $dest_coord); |
|
1888
|
|
|
} else { |
|
1889
|
|
|
$result = $this->move_msg(_MD_CHESS_MOVE_CAPTURED, $fig_name, $dest_coord, $fig_coord); |
|
1890
|
|
|
} |
|
1891
|
|
|
|
|
1892
|
|
|
/* if pawn reached last line convert into a queen */ |
|
1893
|
|
|
|
|
1894
|
|
|
if ('P' == $fig_type) { |
|
1895
|
|
|
if (('w' == $cur_player && $dest_pos >= 56) |
|
1896
|
|
|
|| ('b' == $cur_player && $dest_pos <= 7)) { |
|
1897
|
|
|
$pawn_upg = $move[\mb_strlen($move) - 1]; |
|
1898
|
|
|
|
|
1899
|
|
|
if ('?' == $pawn_upg) { |
|
1900
|
|
|
$pawn_upg = 'Q'; |
|
1901
|
|
|
|
|
1902
|
|
|
$history_move = \sprintf('%sQ', $history_move); |
|
1903
|
|
|
} |
|
1904
|
|
|
|
|
1905
|
|
|
$this->board[$dest_pos] = "$cur_player$pawn_upg"; |
|
1906
|
|
|
|
|
1907
|
|
|
$result .= ' ... ' . $this->move_msg(_MD_CHESS_MOVE_PROMOTED, $this->getFullFigureName($pawn_upg)); |
|
1908
|
|
|
} |
|
1909
|
|
|
} |
|
1910
|
|
|
|
|
1911
|
|
|
$move_handled = 1; |
|
1912
|
|
|
} |
|
1913
|
|
|
|
|
1914
|
|
|
/* if a legal move was performed test whether you |
|
1915
|
|
|
* check the opponent or even check-mate him. then |
|
1916
|
|
|
* update castling and en-passant flags, select the |
|
1917
|
|
|
* next player and add the move to the history. */ |
|
1918
|
|
|
|
|
1919
|
|
|
if ($move_handled) { |
|
1920
|
|
|
// Use $this->board to update $this->gamestate['fen_piece_placement']. |
|
1921
|
|
|
|
|
1922
|
|
|
$this->board_to_fen_piece_placement(); |
|
1923
|
|
|
|
|
1924
|
|
|
// handle check, checkmate and stalemate |
|
1925
|
|
|
|
|
1926
|
|
|
$comment = ''; |
|
1927
|
|
|
|
|
1928
|
|
|
if ($this->kingIsUnderAttack($cur_opp, $cur_player)) { |
|
1929
|
|
|
// if this is check mate finish the game, otherwise if not just add a + to the move |
|
1930
|
|
|
|
|
1931
|
|
|
if ($this->isCheckMate($cur_opp, $cur_player)) { |
|
1932
|
|
|
$this->gamestate['pgn_result'] = 'w' == $cur_player ? '1-0' : '0-1'; |
|
1933
|
|
|
|
|
1934
|
|
|
$history_move .= '#'; |
|
1935
|
|
|
|
|
1936
|
|
|
$result .= ' ... ' . _MD_CHESS_MOVE_CHECKMATE; |
|
1937
|
|
|
} else { |
|
1938
|
|
|
$history_move .= '+'; |
|
1939
|
|
|
} |
|
1940
|
|
|
} elseif ($this->isStaleMate($cur_opp, $cur_player)) { |
|
1941
|
|
|
$this->gamestate['pgn_result'] = '1/2-1/2'; |
|
1942
|
|
|
|
|
1943
|
|
|
$result .= ' ... ' . _MD_CHESS_MOVE_STALEMATE; |
|
1944
|
|
|
|
|
1945
|
|
|
$comment = _MD_CHESS_DRAW_STALEMATE; |
|
1946
|
|
|
} elseif ($this->insufficient_mating_material()) { |
|
1947
|
|
|
$this->gamestate['pgn_result'] = '1/2-1/2'; |
|
1948
|
|
|
|
|
1949
|
|
|
$result .= ' ... ' . _MD_CHESS_MOVE_MATERIAL; |
|
1950
|
|
|
|
|
1951
|
|
|
$comment = _MD_CHESS_DRAW_NO_MATE; |
|
1952
|
|
|
} |
|
1953
|
|
|
|
|
1954
|
|
|
// store possible castling-availability modification |
|
1955
|
|
|
|
|
1956
|
|
|
$KQkq = ($white_may_castle_short ? 'K' : '') . ($white_may_castle_long ? 'Q' : '') . ($black_may_castle_short ? 'k' : '') . ($black_may_castle_long ? 'q' : ''); |
|
1957
|
|
|
|
|
1958
|
|
|
$this->gamestate['fen_castling_availability'] = !empty($KQkq) ? $KQkq : '-'; |
|
1959
|
|
|
|
|
1960
|
|
|
// strip old result-string from end of movetext |
|
1961
|
|
|
|
|
1962
|
|
|
// It's assumed that the movetext for a game in play is terminated by a '*', possibly preceded by whitespace. |
|
1963
|
|
|
|
|
1964
|
|
|
// (The whitespace will be present unless there are no moves in the game yet.) |
|
1965
|
|
|
|
|
1966
|
|
|
$this->gamestate['pgn_movetext'] = \preg_replace('/\s*\*$/', '', $this->gamestate['pgn_movetext']); |
|
1967
|
|
|
|
|
1968
|
|
|
// if white move, output move-number |
|
1969
|
|
|
|
|
1970
|
|
|
if ('w' == $this->gamestate['fen_active_color']) { |
|
1971
|
|
|
if (!empty($this->gamestate['pgn_movetext'])) { |
|
1972
|
|
|
$this->gamestate['pgn_movetext'] .= ' '; |
|
1973
|
|
|
} |
|
1974
|
|
|
|
|
1975
|
|
|
$this->gamestate['pgn_movetext'] .= $this->gamestate['fen_fullmove_number'] . '.'; |
|
1976
|
|
|
// if black move, no moves yet, and game is setup, output move number with special '...' terminator |
|
1977
|
|
|
} elseif (empty($this->gamestate['pgn_movetext']) && !empty($this->gamestate['pgn_fen'])) { |
|
1978
|
|
|
$this->gamestate['pgn_movetext'] .= $this->gamestate['fen_fullmove_number'] . '...'; |
|
1979
|
|
|
} |
|
1980
|
|
|
|
|
1981
|
|
|
// update movetext |
|
1982
|
|
|
|
|
1983
|
|
|
// comment is added only for a concluded game |
|
1984
|
|
|
|
|
1985
|
|
|
$this->gamestate['pgn_movetext'] .= ' ' . $history_move . ' ' . $this->gamestate['pgn_result']; |
|
1986
|
|
|
|
|
1987
|
|
|
if (!empty($comment)) { |
|
1988
|
|
|
$this->gamestate['pgn_movetext'] .= ' {' . $comment . '}'; |
|
1989
|
|
|
} |
|
1990
|
|
|
|
|
1991
|
|
|
// if black move, increment move-number |
|
1992
|
|
|
|
|
1993
|
|
|
if ('b' == $this->gamestate['fen_active_color']) { |
|
1994
|
|
|
++$this->gamestate['fen_fullmove_number']; |
|
1995
|
|
|
} |
|
1996
|
|
|
|
|
1997
|
|
|
// If pawn advance or capturing move, reset the halfmove clock. Otherwise increment it. |
|
1998
|
|
|
|
|
1999
|
|
|
if ('O-O' != $move && 'O-O-O' != $move && (0 === \\strpos($move, 'P') || 'x' == $move[3])) { |
|
2000
|
|
|
$this->gamestate['fen_halfmove_clock'] = 0; |
|
2001
|
|
|
} else { |
|
2002
|
|
|
++$this->gamestate['fen_halfmove_clock']; |
|
2003
|
|
|
} |
|
2004
|
|
|
|
|
2005
|
|
|
// set next player |
|
2006
|
|
|
|
|
2007
|
|
|
$this->gamestate['fen_active_color'] = 'w' == $this->gamestate['fen_active_color'] ? 'b' : 'w'; |
|
2008
|
|
|
} |
|
2009
|
|
|
|
|
2010
|
|
|
return [$move_handled, $result]; |
|
2011
|
|
|
} |
|
2012
|
|
|
|
|
2013
|
|
|
/** |
|
2014
|
|
|
* Check whether a tile is empty. |
|
2015
|
|
|
* |
|
2016
|
|
|
* @param int $position |
|
2017
|
|
|
* @return bool |
|
2018
|
|
|
* |
|
2019
|
|
|
* @access private |
|
2020
|
|
|
*/ |
|
2021
|
|
|
public function is_empty_tile($position) |
|
2022
|
|
|
{ |
|
2023
|
|
|
return '00' == $this->board[$position]; |
|
2024
|
|
|
} |
|
2025
|
|
|
|
|
2026
|
|
|
/** |
|
2027
|
|
|
* Clear a tile. |
|
2028
|
|
|
* |
|
2029
|
|
|
* @param int $position Position of tile |
|
2030
|
|
|
* |
|
2031
|
|
|
* @access private |
|
2032
|
|
|
*/ |
|
2033
|
|
|
public function clear_tile($position) |
|
2034
|
|
|
{ |
|
2035
|
|
|
$this->board[$position] = '00'; |
|
2036
|
|
|
} |
|
2037
|
|
|
|
|
2038
|
|
|
/** |
|
2039
|
|
|
* Convert FEN piece placement field to array. |
|
2040
|
|
|
* |
|
2041
|
|
|
* Use $this->gamestate['fen_piece_placement'] to initialize $this->board, $this->w_figures and $this->b_figures. |
|
2042
|
|
|
* |
|
2043
|
|
|
* @return bool True if piece placement is valid, otherwise false. |
|
2044
|
|
|
* |
|
2045
|
|
|
* @access private |
|
2046
|
|
|
*/ |
|
2047
|
|
|
public function fen_piece_placement_to_board() |
|
2048
|
|
|
{ |
|
2049
|
|
|
if (empty($this->gamestate['fen_piece_placement']) || \mb_strlen($this->gamestate['fen_piece_placement']) > 71) { |
|
2050
|
|
|
#trigger_error('piece placement empty or length invalid', E_USER_WARNING); #*#DEBUG# |
|
2051
|
|
|
return false; // invalid length |
|
2052
|
|
|
} |
|
2053
|
|
|
|
|
2054
|
|
|
$this->board = []; |
|
2055
|
|
|
|
|
2056
|
|
|
$piece_map = [ |
|
2057
|
|
|
'K' => 'wK', |
|
2058
|
|
|
'Q' => 'wQ', |
|
2059
|
|
|
'R' => 'wR', |
|
2060
|
|
|
'B' => 'wB', |
|
2061
|
|
|
'N' => 'wN', |
|
2062
|
|
|
'P' => 'wP', |
|
2063
|
|
|
'k' => 'bK', |
|
2064
|
|
|
'q' => 'bQ', |
|
2065
|
|
|
'r' => 'bR', |
|
2066
|
|
|
'b' => 'bB', |
|
2067
|
|
|
'n' => 'bN', |
|
2068
|
|
|
'p' => 'bP', |
|
2069
|
|
|
]; |
|
2070
|
|
|
|
|
2071
|
|
|
$tiles = \implode('', \array_reverse(\explode('/', $this->gamestate['fen_piece_placement']))); |
|
2072
|
|
|
|
|
2073
|
|
|
for ($i = 0, $iMax = mb_strlen($tiles); $i < $iMax; ++$i) { |
|
2074
|
|
|
$tile = $tiles[$i]; |
|
2075
|
|
|
|
|
2076
|
|
|
if (isset($piece_map[$tile])) { |
|
2077
|
|
|
$this->board[] = $piece_map[$tile]; |
|
2078
|
|
|
} elseif (\is_numeric($tile) && $tile >= 1 && $tile <= 8) { |
|
2079
|
|
|
for ($j = 0; $j < $tile; ++$j) { |
|
2080
|
|
|
$this->board[] = '00'; |
|
2081
|
|
|
} |
|
2082
|
|
|
} else { |
|
2083
|
|
|
#trigger_error("tile='$tile'", E_USER_WARNING); #*#DEBUG# |
|
2084
|
|
|
return false; // unexpected character in piece_placement |
|
2085
|
|
|
} |
|
2086
|
|
|
} |
|
2087
|
|
|
|
|
2088
|
|
|
if (64 != \count($this->board)) { |
|
2089
|
|
|
#trigger_error('count(board)=' . count($this->board), E_USER_WARNING); #*#DEBUG# |
|
2090
|
|
|
return false; // piece_placement has incorrect number of tiles |
|
2091
|
|
|
} |
|
2092
|
|
|
|
|
2093
|
|
|
$this->w_figures = []; |
|
2094
|
|
|
|
|
2095
|
|
|
$this->b_figures = []; |
|
2096
|
|
|
|
|
2097
|
|
|
for ($i = 0; $i < 64; ++$i) { |
|
2098
|
|
|
$tile = $this->board[$i]; |
|
2099
|
|
|
|
|
2100
|
|
|
$coordinates = $this->boardIndexToCoord($i); |
|
2101
|
|
|
|
|
2102
|
|
|
if ('w' == $tile[0]) { |
|
2103
|
|
|
$this->w_figures[] = $tile[1] . $coordinates; |
|
2104
|
|
|
} elseif ('b' == $tile[0]) { |
|
2105
|
|
|
$this->b_figures[] = $tile[1] . $coordinates; |
|
2106
|
|
|
} |
|
2107
|
|
|
} |
|
2108
|
|
|
|
|
2109
|
|
|
return true; |
|
2110
|
|
|
} |
|
2111
|
|
|
|
|
2112
|
|
|
/** |
|
2113
|
|
|
* Convert array to FEN piece placement field. |
|
2114
|
|
|
* |
|
2115
|
|
|
* Use $this->board to initialize $this->gamestate['fen_piece_placement']. |
|
2116
|
|
|
* |
|
2117
|
|
|
* @access private |
|
2118
|
|
|
*/ |
|
2119
|
|
|
public function board_to_fen_piece_placement() |
|
2120
|
|
|
{ |
|
2121
|
|
|
$rows = []; |
|
2122
|
|
|
|
|
2123
|
|
|
for ($rank = 7; $rank >= 0; --$rank) { |
|
2124
|
|
|
$row = ''; |
|
2125
|
|
|
|
|
2126
|
|
|
for ($file = 0; $file < 8; ++$file) { |
|
2127
|
|
|
$index = 8 * $rank + $file; |
|
2128
|
|
|
|
|
2129
|
|
|
if (!$this->is_empty_tile($index)) { |
|
2130
|
|
|
$tile = $this->board[$index]; |
|
2131
|
|
|
|
|
2132
|
|
|
$piece = 'w' == $tile[0] ? $tile[1] : \mb_strtolower($tile[1]); // 'K','Q','R','B','N' or 'P' (uppercase for white, lowercase for black) |
|
2133
|
|
|
} else { |
|
2134
|
|
|
$piece = 'x'; // temporarily mark each empty tile with 'x' |
|
2135
|
|
|
} |
|
2136
|
|
|
|
|
2137
|
|
|
$row .= $piece; // append piece symbol to row-string |
|
2138
|
|
|
} |
|
2139
|
|
|
|
|
2140
|
|
|
$rows[] = $row; |
|
2141
|
|
|
} |
|
2142
|
|
|
|
|
2143
|
|
|
// Concatenate the eight row-strings with the separator '/'. |
|
2144
|
|
|
|
|
2145
|
|
|
// Then replace each string of x's with the string length. |
|
2146
|
|
|
|
|
2147
|
|
|
$this->gamestate['fen_piece_placement'] = \\preg_replace_callback('/(x+)/', static static function($matches) {return \\strlen($matches[1]);}, \\implode('/', $rows)); |
|
2148
|
|
|
} |
|
2149
|
|
|
|
|
2150
|
|
|
/** |
|
2151
|
|
|
* Determine whether there is insufficient material to mate. |
|
2152
|
|
|
* |
|
2153
|
|
|
* @return bool True if only the following pieces remain: K vs. K, K vs. K+B or K vs. K+N; otherwise false. |
|
2154
|
|
|
* |
|
2155
|
|
|
* @access private |
|
2156
|
|
|
*/ |
|
2157
|
|
|
public function insufficient_mating_material() |
|
2158
|
|
|
{ |
|
2159
|
|
|
$pieces = \mb_strtoupper($this->gamestate['fen_piece_placement']); |
|
2160
|
|
|
|
|
2161
|
|
|
$counts = \count_chars($pieces, 1); |
|
2162
|
|
|
|
|
2163
|
|
|
$num_queens = (int)@$counts[\ord('Q')]; |
|
2164
|
|
|
|
|
2165
|
|
|
$num_rooks = (int)@$counts[\ord('R')]; |
|
2166
|
|
|
|
|
2167
|
|
|
$num_bishops = (int)@$counts[\ord('B')]; |
|
2168
|
|
|
|
|
2169
|
|
|
$num_knights = (int)@$counts[\ord('N')]; |
|
2170
|
|
|
|
|
2171
|
|
|
$num_pawns = (int)@$counts[\ord('P')]; |
|
2172
|
|
|
|
|
2173
|
|
|
return 0 == $num_queens && 0 == $num_rooks && ($num_bishops + $num_knights) <= 1 && 0 == $num_pawns; |
|
2174
|
|
|
} |
|
2175
|
|
|
|
|
2176
|
|
|
// -------------------------- |
|
2177
|
|
|
|
|
2178
|
|
|
// INCIDENTAL PRIVATE METHODS |
|
2179
|
|
|
|
|
2180
|
|
|
// -------------------------- |
|
2181
|
|
|
|
|
2182
|
|
|
// These functions don't really need to be class methods, since they don't access class properties. |
|
2183
|
|
|
|
|
2184
|
|
|
// They're placed within the class only for name-scoping. |
|
2185
|
|
|
|
|
2186
|
|
|
/** |
|
2187
|
|
|
* Convert board coordinates [a-h][1-8] to board index [0..63] |
|
2188
|
|
|
* |
|
2189
|
|
|
* @param string $coord Example: 'b3' |
|
2190
|
|
|
* @return int Example: 17 |
|
2191
|
|
|
* |
|
2192
|
|
|
* @access private |
|
2193
|
|
|
*/ |
|
2194
|
|
|
public function boardCoordToIndex($coord) |
|
2195
|
|
|
{ |
|
2196
|
|
|
//echo $coord," --> "; |
|
2197
|
|
|
|
|
2198
|
|
|
switch ($coord[0]) { |
|
2199
|
|
|
case 'a': |
|
2200
|
|
|
$x = 0; |
|
2201
|
|
|
break; |
|
2202
|
|
|
case 'b': |
|
2203
|
|
|
$x = 1; |
|
2204
|
|
|
break; |
|
2205
|
|
|
case 'c': |
|
2206
|
|
|
$x = 2; |
|
2207
|
|
|
break; |
|
2208
|
|
|
case 'd': |
|
2209
|
|
|
$x = 3; |
|
2210
|
|
|
break; |
|
2211
|
|
|
case 'e': |
|
2212
|
|
|
$x = 4; |
|
2213
|
|
|
break; |
|
2214
|
|
|
case 'f': |
|
2215
|
|
|
$x = 5; |
|
2216
|
|
|
break; |
|
2217
|
|
|
case 'g': |
|
2218
|
|
|
$x = 6; |
|
2219
|
|
|
break; |
|
2220
|
|
|
case 'h': |
|
2221
|
|
|
$x = 7; |
|
2222
|
|
|
break; |
|
2223
|
|
|
default: |
|
2224
|
|
|
return 64; /* erronous coord */ |
|
2225
|
|
|
} |
|
2226
|
|
|
|
|
2227
|
|
|
$y = $coord[1] - 1; |
|
2228
|
|
|
|
|
2229
|
|
|
if ($y < 0 || $y > 7) { |
|
2230
|
|
|
return 64; |
|
2231
|
|
|
} /* erronous coord */ |
|
2232
|
|
|
|
|
2233
|
|
|
return $y * 8 + $x; |
|
2234
|
|
|
//echo "$index | "; |
|
2235
|
|
|
} |
|
2236
|
|
|
|
|
2237
|
|
|
/** |
|
2238
|
|
|
* Convert board index [0..63] to board coordinates [a-h][1-8]. |
|
2239
|
|
|
* |
|
2240
|
|
|
* @param int $index Example: 17 |
|
2241
|
|
|
* @return string Example: 'b3' |
|
2242
|
|
|
* |
|
2243
|
|
|
* @access private |
|
2244
|
|
|
*/ |
|
2245
|
|
|
public function boardIndexToCoord($index) |
|
2246
|
|
|
{ |
|
2247
|
|
|
//echo $index," --> "; |
|
2248
|
|
|
|
|
2249
|
|
|
if ($index < 0 || $index > 63) { |
|
2250
|
|
|
return ''; |
|
2251
|
|
|
} |
|
2252
|
|
|
|
|
2253
|
|
|
$y = \floor($index / 8) + 1; |
|
2254
|
|
|
|
|
2255
|
|
|
$x = \chr(($index % 8) + 97); |
|
2256
|
|
|
|
|
2257
|
|
|
return "$x$y"; |
|
2258
|
|
|
} |
|
2259
|
|
|
|
|
2260
|
|
|
/** |
|
2261
|
|
|
* Get piece name from piece symbol. |
|
2262
|
|
|
* |
|
2263
|
|
|
* @param string $short Piece symbol |
|
2264
|
|
|
* @return string Piece name |
|
2265
|
|
|
* |
|
2266
|
|
|
* @access private |
|
2267
|
|
|
*/ |
|
2268
|
|
|
public function getFullFigureName($short) |
|
2269
|
|
|
{ |
|
2270
|
|
|
static $names = [ |
|
2271
|
|
|
'K' => _MD_CHESS_MOVE_KING, |
|
2272
|
|
|
'Q' => _MD_CHESS_MOVE_QUEEN, |
|
2273
|
|
|
'R' => _MD_CHESS_MOVE_ROOK, |
|
2274
|
|
|
'B' => _MD_CHESS_MOVE_BISHOP, |
|
2275
|
|
|
'N' => _MD_CHESS_MOVE_KNIGHT, |
|
2276
|
|
|
'P' => _MD_CHESS_MOVE_PAWN, |
|
2277
|
|
|
]; |
|
2278
|
|
|
|
|
2279
|
|
|
return $names[$short] ?? _MD_CHESS_MOVE_EMPTY; |
|
2280
|
|
|
} |
|
2281
|
|
|
|
|
2282
|
|
|
/** |
|
2283
|
|
|
* Get tiles adjacent to specified tile. |
|
2284
|
|
|
* |
|
2285
|
|
|
* @param int $fig_pos |
|
2286
|
|
|
* @return array |
|
2287
|
|
|
* |
|
2288
|
|
|
* @access private |
|
2289
|
|
|
*/ |
|
2290
|
|
|
public function getAdjTiles($fig_pos) |
|
2291
|
|
|
{ |
|
2292
|
|
|
$adj_tiles = []; |
|
2293
|
|
|
|
|
2294
|
|
|
$i = 0; |
|
2295
|
|
|
|
|
2296
|
|
|
$x = $fig_pos % 8; |
|
2297
|
|
|
|
|
2298
|
|
|
$y = \floor($fig_pos / 8); |
|
2299
|
|
|
|
|
2300
|
|
|
if ($x > 0 && $y > 0) { |
|
2301
|
|
|
$adj_tiles[$i++] = $fig_pos - 9; |
|
2302
|
|
|
} |
|
2303
|
|
|
|
|
2304
|
|
|
if ($y > 0) { |
|
2305
|
|
|
$adj_tiles[$i++] = $fig_pos - 8; |
|
2306
|
|
|
} |
|
2307
|
|
|
|
|
2308
|
|
|
if ($x < 7 && $y > 0) { |
|
2309
|
|
|
$adj_tiles[$i++] = $fig_pos - 7; |
|
2310
|
|
|
} |
|
2311
|
|
|
|
|
2312
|
|
|
if ($x < 7) { |
|
2313
|
|
|
$adj_tiles[$i++] = $fig_pos + 1; |
|
2314
|
|
|
} |
|
2315
|
|
|
|
|
2316
|
|
|
if ($x < 7 && $y < 7) { |
|
2317
|
|
|
$adj_tiles[$i++] = $fig_pos + 9; |
|
2318
|
|
|
} |
|
2319
|
|
|
|
|
2320
|
|
|
if ($y < 7) { |
|
2321
|
|
|
$adj_tiles[$i++] = $fig_pos + 8; |
|
2322
|
|
|
} |
|
2323
|
|
|
|
|
2324
|
|
|
if ($x > 0 && $y < 7) { |
|
2325
|
|
|
$adj_tiles[$i++] = $fig_pos + 7; |
|
2326
|
|
|
} |
|
2327
|
|
|
|
|
2328
|
|
|
if ($x > 0) { |
|
2329
|
|
|
$adj_tiles[$i++] = $fig_pos - 1; |
|
2330
|
|
|
} |
|
2331
|
|
|
|
|
2332
|
|
|
/* DEBUG: foreach( $adj_tiles as $tile ) |
|
2333
|
|
|
echo "adj: $tile "; */ |
|
2334
|
|
|
|
|
2335
|
|
|
return $adj_tiles; |
|
2336
|
|
|
} |
|
2337
|
|
|
} // class ChessGame |
|
2338
|
|
|
|
|
2339
|
|
|
?> |
|
2340
|
|
|
|
mambax7 /
chess
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