Mercurial > hg > terminal-chess / file comparison
comparison: src/chess/rules.c
src/chess/rules.c
- changeset 179
- 5ef724e21702
- parent 177
- 18dbb0dc9cd6
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| 178:724e8acff6f8 | 179:5ef724e21702 |
|---|---|
| 295 } | 295 } |
| 296 } | 296 } |
| 297 return false; | 297 return false; |
| 298 } | 298 } |
| 299 | 299 |
| 300 static bool check_no_material_color(Color color, const GameState *gamestate) { | |
| 301 /* count the available pieces */ | |
| 302 unsigned piece_count[7] = {0}; | |
| 303 unsigned op_piece_count[7] = {0}; | |
| 304 bool has_bbishop = false, has_wbishop = false; | |
| 305 bool op_has_bbishop = false, op_has_wbishop = false; | |
| 306 for (Row r = 0 ; r < 8 ; r++) { | |
| 307 for (File f = 0 ; f < 8 ; f++) { | |
| 308 Piece p = piece_at(gamestate, r, f); | |
| 309 if (piece_color(p) == color) { | |
| 310 piece_count[piece_type(p)]++; | |
| 311 if (piece_type(p) == BISHOP) { | |
| 312 if (field_color(r, f) == WHITE) { | |
| 313 has_wbishop = true; | |
| 314 } else { | |
| 315 has_bbishop = true; | |
| 316 } | |
| 317 } | |
| 318 } else { | |
| 319 op_piece_count[piece_type(p)]++; | |
| 320 if (piece_type(p) == BISHOP) { | |
| 321 if (field_color(r, f) == WHITE) { | |
| 322 op_has_wbishop = true; | |
| 323 } else { | |
| 324 op_has_bbishop = true; | |
| 325 } | |
| 326 } | |
| 327 } | |
| 328 } | |
| 329 } | |
| 330 | |
| 331 /* rooks and queens are always enough - don't test them below */ | |
| 332 if (piece_count[ROOK] > 0 || piece_count[QUEEN] > 0) | |
| 333 return false; | |
| 334 | |
| 335 /* only the king left */ | |
| 336 if (piece_count[PAWN] == 0 && piece_count[KNIGHT] == 0 | |
| 337 && piece_count[BISHOP] == 0) | |
| 338 return true; | |
| 339 | |
| 340 /* king + knight and the opponent has only king + queens */ | |
| 341 if (piece_count[PAWN] == 0 && piece_count[BISHOP] == 0 | |
| 342 && piece_count[KNIGHT] == 1 | |
| 343 && op_piece_count[ROOK] == 0 && op_piece_count[BISHOP] == 0 | |
| 344 && op_piece_count[KNIGHT] == 0 && op_piece_count[PAWN] == 0 | |
| 345 && op_piece_count[QUEEN] > 0) | |
| 346 return true; | |
| 347 | |
| 348 /* king + bishop and the opponent doesn't have | |
| 349 * opposite color bishops or knights or pawns */ | |
| 350 if (piece_count[PAWN] == 0 && piece_count[KNIGHT] == 0 | |
| 351 && piece_count[BISHOP] > 0) { | |
| 352 | |
| 353 if (op_piece_count[KNIGHT] > 0 || op_piece_count[PAWN] > 0) | |
| 354 return false; | |
| 355 | |
| 356 if (has_bbishop && op_has_wbishop) | |
| 357 return false; | |
| 358 | |
| 359 if (has_wbishop && op_has_bbishop) | |
| 360 return false; | |
| 361 | |
| 362 return true; | |
| 363 } | |
| 364 | |
| 365 return false; | |
| 366 } | |
| 367 | |
| 368 bool check_no_material(const GameState *gamestate) { | |
| 369 return check_no_material_color(WHITE, gamestate) | |
| 370 && check_no_material_color(BLACK, gamestate); | |
| 371 } | |
| 372 | |
| 300 char getpiecechr(Piece piece) { | 373 char getpiecechr(Piece piece) { |
| 301 switch (piece_type(piece)) { | 374 switch (piece_type(piece)) { |
| 302 case ROOK: return 'R'; | 375 case ROOK: return 'R'; |
| 303 case KNIGHT: return 'N'; | 376 case KNIGHT: return 'N'; |
| 304 case BISHOP: return 'B'; | 377 case BISHOP: return 'B'; |
| 415 apply_move_internal(gamestate, move); | 488 apply_move_internal(gamestate, move); |
| 416 | 489 |
| 417 /* calculate gamestate flags in order of efficiency */ | 490 /* calculate gamestate flags in order of efficiency */ |
| 418 if (move->checkmate) { | 491 if (move->checkmate) { |
| 419 gamestate->checkmate = true; | 492 gamestate->checkmate = true; |
| 493 } else if (check_no_material(gamestate)) { | |
| 494 gamestate->nomaterial = true; | |
| 420 } else if (check_threefold_repetition(gamestate)) { | 495 } else if (check_threefold_repetition(gamestate)) { |
| 421 gamestate->threefold = true; | 496 gamestate->threefold = true; |
| 422 } else if (check_stalemate(gamestate)) { | 497 } else if (check_stalemate(gamestate)) { |
| 423 gamestate->stalemate = true; | 498 gamestate->stalemate = true; |
| 424 } | 499 } |
