stellar

UCI Chess engine written in C++20
git clone git://git.dimitrijedobrota.com/stellar.git
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commita0ffb46f5a2aecd3073adcc6a10dc11fc528c295
parentb14f53fa424df7b70d8ac02b8ae7b619016e8d02
authorDimitrije Dobrota <mail@dimitrijedobrota.com>
dateSat, 24 Sep 2022 12:42:54 +0200

Generate pawn captures

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

1 files changed, 70 insertions(+), 26 deletions(-)

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

@@ -186,40 +186,84 @@ void CBoard_move_generate(CBoard_T self) {

for (int color = 0; color < 2; color++) {
// Generate quiet pawn moves
{
int add = (color == WHITE) ? +8 : -8;
Piece_T Piece = &Pieces[color][PAWN];
bitboard = self->pieceBB[PAWN] & self->colorBB[color];
while (bitboard) {
target = source = bit_lsb_index(bitboard);
target += add;
if (target > a1 && target < h8 && !bit_get(occupancy, target)) {
// promote
if ((color == WHITE && source >= a7 && source <= h7) ||
(color == BLACK && source >= a2 && source <= h2)) {
// add move to move list
printf("PROMOTION!!! ");
} else {
// one ahead
// add move to move list
printf("SINGLE PUSH!!! ");
// two ahead
if (((color == BLACK && source >= a7 && source <= h7) ||
(color == WHITE && source >= a2 && source <= h2)) &&
!bit_get(occupancy, target + add)) {
// add to move list;
printf("DOUBLE PUSH!!! ");
// push
{
int add = (color == WHITE) ? +8 : -8;
target = source = bit_lsb_index(bitboard);
target += add;
if (target > a1 && target < h8 && !bit_get(occupancy, target)) {
// promote
if ((color == WHITE && source >= a7 && source <= h7) ||
(color == BLACK && source >= a2 && source <= h2)) {
// add move to move list
printf("PROMOTION!!! ");
} else {
// one ahead
// add move to move list
printf("SINGLE PUSH!!! ");
// two ahead
if (((color == BLACK && source >= a7 && source <= h7) ||
(color == WHITE && source >= a2 && source <= h2)) &&
!bit_get(occupancy, target + add)) {
// add to move list;
printf("DOUBLE PUSH!!! ");
}
printf("%s pawn: %s; target: %s\n",
(color == WHITE) ? "white" : "black",
square_to_coordinates[source],
square_to_coordinates[target]);
}
}
}
// Capture
{
attack = Piece->attacks(source, occupancy) & self->colorBB[!color];
while (attack) {
target = bit_lsb_index(attack);
bit_pop(attack, target);
if ((color == WHITE && source >= a7 && source <= h7) ||
(color == BLACK && source >= a2 && source <= h2)) {
// add move to move list
printf("Capture PROMOTION!!! ");
} else {
printf("%s pawn: %s; Capture: %s\n",
(color == WHITE) ? "white" : "black",
square_to_coordinates[source],
square_to_coordinates[target]);
}
}
}
// enpassant
{
if (self->enpassant != no_sq) {
attack =
Piece->attacks(source, occupancy) & (C64(1) << self->enpassant);
if (attack) {
target = bit_lsb_index(attack);
printf("%s enpassand %s\n", square_to_coordinates[source],
square_to_coordinates[target]);
}
}
printf("%s pawn: %s; target: %s\n",
(color == WHITE) ? "white" : "black",
square_to_coordinates[source], square_to_coordinates[target]);
}
bit_pop(bitboard, source);
}
/* for (int piece = 0; piece < 6; piece++) { */
/* bitboard = self->pieceBB[piece] & self->colorBB[color]; */
/* } */
for (int piece = 1; piece < 6; piece++) {
bitboard = self->pieceBB[piece] & self->colorBB[color];
Piece_T Piece = &Pieces[color][piece];
while (bitboard) {
source = bit_lsb_index(bitboard);
bit_pop(bitboard, source);
attack = Piece->attacks(source, occupancy) &
(C64(-1) ^ self->colorBB[color]);
printf("%s: %s; moves: %d\n", Piece->unicode,
square_to_coordinates[source], bit_count(attack));
}
}
}
}
}