stellar

UCI Chess engine written in C++20
git clone git://git.dimitrijedobrota.com/stellar.git
Log | Files | Refs | README | LICENSE |
commit7b2569935d801ef3659cb6e86b59a435af5dce76
parentbbb6134ee38af2a035916cda78f194444add86e7
authorDimitrije Dobrota <mail@dimitrijedobrota.com>
dateMon, 19 Sep 2022 20:14:12 +0200

Populating Occupancy function

Diffstat:
Msrc/engine.c|++++++++++++++++++++----------

1 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/src/engine.c b/src/engine.c

@@ -244,18 +244,28 @@ void init_leapers_attacks(void) {

}
}
U64 set_occupancy(int index, int bits_in_mask, U64 attack_mask) {
U64 occupancy = C64(0);
for (int count = 0; count < bits_in_mask; count++) {
int square = bit_lsb_index(attack_mask);
bit_pop(attack_mask, square);
if (index & (1 << count))
bit_set(occupancy, square);
}
return occupancy;
}
int main(void) {
init_leapers_attacks();
U64 block = C64(0);
bit_set(block, e4);
bit_set(block, e5);
bit_set(block, d4);
bit_set(block, d5);
bitboard_print(block);
bitboard_print((block & -block) - 1);
int cord = bit_lsb_index(block);
printf("%d: %s\n", cord, square_to_coordinates[cord]);
U64 attack_mask = mask_rook_attacks(a1);
for (int i = 0; i < 4096; i++) {
U64 occupancy = set_occupancy(i, bit_count(attack_mask), attack_mask);
bitboard_print(occupancy);
getc(stdin);
}
return 0;
}