stellar

UCI Chess engine written in C++20
git clone git://git.dimitrijedobrota.com/stellar.git
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commita329d919aec6b3ea7b12925a5cba310b5bd7613b
parent29568808a50e6f13021dcc79acdfc864fbcdefea
authorDimitrije Dobrota <mail@dimitrijedobrota.com>
dateMon, 19 Sep 2022 18:16:13 +0200

Rook attack mask

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

1 files changed, 20 insertions(+), 0 deletions(-)

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

@@ -187,6 +187,24 @@ U64 mask_bishup_attacks(int square) {

return attacks;
}
U64 mask_rook_attacks(int square) {
U64 bitboard = C64(0), attacks = C64(0), tmp;
int tr = square / 8, tf = square % 8, i;
bit_set(bitboard, square);
for (i = 0, tmp = bitboard; i < tf - 1; i++)
attacks |= tmp = westOne(tmp);
for (i = 0, tmp = bitboard; i < tr - 1; i++)
attacks |= tmp = soutOne(tmp);
for (i = 0, tmp = bitboard; i < 6 - tf; i++)
attacks |= tmp = eastOne(tmp);
for (i = 0, tmp = bitboard; i < 6 - tr; i++)
attacks |= tmp = nortOne(tmp);
return attacks;
}
void init_leapers_attacks(void) {
for (int square = 0; square < 64; square++) {
pawn_attacks[WHITE][square] = mask_pawn_attacks(WHITE, square);

@@ -198,5 +216,7 @@ void init_leapers_attacks(void) {

int main(void) {
init_leapers_attacks();
for (int square = 0; square < 64; square++)
bitboard_print(mask_rook_attacks(square));
return 0;
}