Mercurial > hg > terminal-chess / file comparison
comparison: src/chess/rules.c
src/chess/rules.c
- changeset 156
- 05fc8a454700
- parent 155
- 835776e0338f
equal
deleted
inserted
replaced
| 155:835776e0338f | 156:05fc8a454700 |
|---|---|
| 678 bool incheck = gamestate->movecount > 0 ? last_move(gamestate).check:false; | 678 bool incheck = gamestate->movecount > 0 ? last_move(gamestate).check:false; |
| 679 | 679 |
| 680 Move threats[16], *threat = NULL; | 680 Move threats[16], *threat = NULL; |
| 681 uint8_t threatcount; | 681 uint8_t threatcount; |
| 682 | 682 |
| 683 /* determine all threats and sort out the unreal threats on our own */ | |
| 683 if (get_threats(gamestate, move->torow, move->tofile, color, | 684 if (get_threats(gamestate, move->torow, move->tofile, color, |
| 684 threats, &threatcount)) { | 685 threats, &threatcount)) { |
| 685 | 686 |
| 686 int reason = PIECE_NOT_FOUND; | 687 bool found = false; |
| 687 | 688 |
| 688 /* find threats for the specified position */ | 689 /* find threats for the specified position */ |
| 689 for (uint8_t i = 0 ; i < threatcount ; i++) { | 690 for (uint8_t i = 0 ; i < threatcount ; i++) { |
| 690 if (threats[i].piece == move->piece && | 691 if (threats[i].piece == move->piece && |
| 691 (move->fromrow == POS_UNSPECIFIED || | 692 (move->fromrow == POS_UNSPECIFIED || |
| 692 move->fromrow == threats[i].fromrow) && | 693 move->fromrow == threats[i].fromrow) && |
| 693 (move->fromfile == POS_UNSPECIFIED || | 694 (move->fromfile == POS_UNSPECIFIED || |
| 694 move->fromfile == threats[i].fromfile)) { | 695 move->fromfile == threats[i].fromfile)) { |
| 695 | 696 |
| 696 if (threat) { | 697 /* found a threat, here it does not matter if it's valid! */ |
| 697 return AMBIGUOUS_MOVE; | 698 found = true; |
| 698 } else { | 699 |
| 699 /* found threat is no real threat */ | 700 /* discard pinned pieces */ |
| 700 // TODO: why didn't we call get_real_threats() ? | 701 if (!is_pinned(gamestate, &(threats[i]))) { |
| 701 if (is_pinned(gamestate, &(threats[i]))) { | 702 if (threat) { |
| 702 reason = incheck?KING_IN_CHECK: | 703 /* we've already found a valid threat */ |
| 703 (piece==KING?KING_MOVES_INTO_CHECK:PIECE_PINNED); | 704 return AMBIGUOUS_MOVE; |
| 704 } else { | 705 } else { |
| 705 threat = &(threats[i]); | 706 threat = &(threats[i]); |
| 706 } | 707 } |
| 707 } | 708 } |
| 708 } | 709 } |
| 709 } | 710 } |
| 710 | 711 |
| 711 /* can't threaten specified position */ | 712 /* can't threaten specified position */ |
| 712 if (!threat) { | 713 if (!threat) { |
| 713 return reason; | 714 if (found) { |
| 715 if (piece == KING) { | |
| 716 return KING_MOVES_INTO_CHECK; | |
| 717 } else if (incheck) { | |
| 718 return KING_IN_CHECK; | |
| 719 } else { | |
| 720 return PIECE_PINNED; | |
| 721 } | |
| 722 } else { | |
| 723 return PIECE_NOT_FOUND; | |
| 724 } | |
| 714 } | 725 } |
| 715 | 726 |
| 716 /* found a threat, copy the source location */ | 727 /* found a threat, copy the source location */ |
| 717 move->fromrow = threat->fromrow; | 728 move->fromrow = threat->fromrow; |
| 718 move->fromfile = threat->fromfile; | 729 move->fromfile = threat->fromfile; |
