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perft2: is_in_check() before recursion

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Bruno Raoult
2024-03-29 09:59:14 +01:00
parent 92d6909546
commit 24207583d1
1 changed files with 7 additions and 9 deletions
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16
src/search.c
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@@ -100,8 +100,6 @@ u64 perft2(pos_t *pos, int depth, int ply)
move_t move;
state_t state;
if (is_in_check(pos, OPPONENT(pos->turn)))
return 0;
if (depth == 0)
return 1;
pos->checkers = pos_checkers(pos, pos->turn);
@@ -113,13 +111,13 @@ u64 perft2(pos_t *pos, int depth, int ply)
for (nmove = 0; nmove < pseudo.nmoves; ++nmove ) {
move = pseudo.move[nmove];
move_do(pos, move);
subnodes = perft2(pos, depth - 1, ply + 1);
nodes += subnodes;
if (ply == 1) {
char movestr[8];
printf("%s: %d\n", move_str(movestr, move, 0), subnodes);
if (!is_in_check(pos, OPPONENT(pos->turn))) {
subnodes = perft2(pos, depth - 1, ply + 1);
nodes += subnodes;
if (ply == 1) {
char movestr[8];
printf("%s: %d\n", move_str(movestr, move, 0), subnodes);
}
}
move_undo(pos, move);
pos->state = state;