forked from antoniogarro/Claudia
-
Notifications
You must be signed in to change notification settings - Fork 0
/
legality.c
80 lines (75 loc) · 3.95 KB
/
legality.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
/***************************************************************************************
* Copyright (c) 2014, Antonio Garro. *
* All rights reserved *
* *
* Redistribution and use in source and binary forms, with or without modification, are *
* permitted provided that the following conditions are met: *
* *
* 1. Redistributions of source code must retain the above copyright notice, this list *
* of conditions and the following disclaimer. *
* *
* 2. Redistributions in binary form must reproduce the above copyright notice, this *
* list of conditions and the following disclaimer in the documentation and/or other *
* materials provided with the distribution. *
* *
* 3. Neither the name of the copyright holder nor the names of its contributors may be *
* used to endorse or promote products derived from this software without specific *
* prior written permission. *
* *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" *
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE *
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE *
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE *
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL *
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR *
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER *
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF *
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
***************************************************************************************/
#include "board.h"
#include "engine.h"
char IsLegal(BOARD *board, MOVE *curr_move)
{
MOVE poss_moves[MAXMOVES];
int nposs_movs = MoveGen(board, poss_moves, 1);
/*We only compare info about squares to decide legality, not captured piece or previous EP:*/
MOVE sqs = SQSMASK(*curr_move);
/*TODO: promoted.*/
for(int i = 0; i < nposs_movs; i++){
if(sqs == SQSMASK(poss_moves[i])){ /*curr_move is possible.*/
MakeMove(board, curr_move);
if(!LeftInCheck(board)){
Takeback(board, *curr_move);
return 1; /*curr_move is legal.*/
}
Takeback(board, *curr_move);
}
}
return 0;
}
int Perft(BOARD *board, int depth)
{
int val = 0;
int nposs_movs = 0;
MOVE poss_moves[MAXMOVES];
nposs_movs = MoveGen(board, poss_moves, 1);
for(int i = 0; i < nposs_movs; i++){
MakeMove(board, &poss_moves[i]);
if(depth > 1){
if(board->white_to_move){
if(!BlackInCheck(board)) val += Perft(board, depth - 1);
}else{
if(!WhiteInCheck(board)) val += Perft(board, depth - 1);
}
}else{
if(board->white_to_move){
if(!BlackInCheck(board)) val++;
}else{
if(!WhiteInCheck(board)) val++;
}
}
Takeback(board, poss_moves[i]);
}
return val;
}