Mercurial > hg > terminal-chess / file comparison
comparison: src/chess/rules.h
src/chess/rules.h
- changeset 179
- 5ef724e21702
- parent 173
- e541b6002933
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| 178:724e8acff6f8 | 179:5ef724e21702 |
|---|---|
| 142 /** a premove that shall be evaluated next time it's our turn */ | 142 /** a premove that shall be evaluated next time it's our turn */ |
| 143 char premove[8]; | 143 char premove[8]; |
| 144 bool checkmate; | 144 bool checkmate; |
| 145 bool stalemate; | 145 bool stalemate; |
| 146 bool threefold; | 146 bool threefold; |
| 147 /** drawn due to insufficient material on both sides */ | |
| 148 bool nomaterial; | |
| 147 /** flag is only set when players agreed on remis */ | 149 /** flag is only set when players agreed on remis */ |
| 148 bool remis; | 150 bool remis; |
| 149 bool wresign; | 151 bool wresign; |
| 150 bool bresign; | 152 bool bresign; |
| 151 /** this flag is only supposed to be set when the opponent disconnects */ | 153 /** this flag is only supposed to be set when the opponent disconnects */ |
| 194 Row row, File file) { | 196 Row row, File file) { |
| 195 return gamestate->board[row][file] & ENPASSANT_THREAT; | 197 return gamestate->board[row][file] & ENPASSANT_THREAT; |
| 196 } | 198 } |
| 197 | 199 |
| 198 static inline bool is_game_drawn(const GameState *gamestate) { | 200 static inline bool is_game_drawn(const GameState *gamestate) { |
| 199 return gamestate->threefold || gamestate->stalemate || gamestate->remis; | 201 return gamestate->threefold || gamestate->stalemate |
| 202 || gamestate->nomaterial || gamestate->remis; | |
| 200 } | 203 } |
| 201 | 204 |
| 202 static inline bool is_game_running(const GameState *gamestate) { | 205 static inline bool is_game_running(const GameState *gamestate) { |
| 203 return !(gamestate->checkmate || gamestate->wresign || gamestate->bresign | 206 return !(gamestate->checkmate || gamestate->wresign || gamestate->bresign |
| 204 || is_game_drawn(gamestate) || gamestate->review); | 207 || is_game_drawn(gamestate) || gamestate->review); |
| 205 } | 208 } |
| 206 | 209 |
| 207 static inline bool is_check_position(const GameState *gamestate) { | 210 static inline bool is_check_position(const GameState *gamestate) { |
| 208 return gamestate->moves[gamestate->movecount - 1].check; | 211 return gamestate->moves[gamestate->movecount - 1].check; |
| 212 } | |
| 213 | |
| 214 static inline Color field_color(Row r, File f) { | |
| 215 return (r + f) % 2 == 0 ? BLACK : WHITE; | |
| 209 } | 216 } |
| 210 | 217 |
| 211 /** | 218 /** |
| 212 * Initializes a game state and prepares the chess board. | 219 * Initializes a game state and prepares the chess board. |
| 213 * @param gamestate the game state to initialize | 220 * @param gamestate the game state to initialize |
| 598 * @param gamestate the current game state | 605 * @param gamestate the current game state |
| 599 * @return true if the game is in a threefold repetition position | 606 * @return true if the game is in a threefold repetition position |
| 600 */ | 607 */ |
| 601 bool check_threefold_repetition(const GameState *gamestate); | 608 bool check_threefold_repetition(const GameState *gamestate); |
| 602 | 609 |
| 610 /** | |
| 611 * Checks if neither side has enough material left to win the game. | |
| 612 * | |
| 613 * Returns true if for both players one of the following three cases are true: | |
| 614 * - they have only the king left | |
| 615 * - they have a king + knight and the opponent has king + queens | |
| 616 * - they have a king + bishop and the opponent doesn't have | |
| 617 * opposite color bishops or knights or pawns | |
| 618 * | |
| 619 * @param gamestate the current game state | |
| 620 * @return true if neither side can win due to insufficient material | |
| 621 */ | |
| 622 bool check_no_material(const GameState *gamestate); | |
| 623 | |
| 603 #endif /* RULES_H */ | 624 #endif /* RULES_H */ |
| 604 | 625 |
