uint64_t calculate_attacking(s_board *board, uint64_t pos, int side)
{
assert(board != NULL);
assert(pos);
assert(side == WHITE || side == BLACK);
int sq = __builtin_ctzll(pos);
uint64_t attackers = 0;
// Pawns
attackers |= board->colour[side] & board->pieces[PAWNS] & magic_moves_pawns(1-side, sq);
// Knights
attackers |= board->colour[side] & board->pieces[KNIGHTS] & magic_moves_knight(sq);
// Bishops & Queens
attackers |= magic_moves_bishop((board->colour[WHITE]|board->colour[BLACK]), sq) & board->colour[WHITE] & (board->pieces[BISHOPS] | board->pieces[QUEENS]);
// Rooks & Queens
attackers |= magic_moves_rook((board->colour[WHITE]|board->colour[BLACK]), sq) & board->colour[WHITE] & (board->pieces[ROOKS] | board->pieces[QUEENS]);
// King
attackers |= magic_moves_king(sq) & board->pieces[KINGS] & board->colour[side];
return attackers;
}
int get_smallest_attacker(s_board *board, int sq, int side)
{
assert(board != NULL);
assert(side == WHITE || side == BLACK);
// Pawns
if(magic_moves_pawns(1-side, sq) & board->pieces[PAWNS] & board->colour[side]) {return PAWNS;}
// Knights
if((board->colour[side] & board->pieces[KNIGHTS]) & magic_moves_knight(sq)) {return KNIGHTS;}
// Bishops
if(magic_moves_bishop((board->colour[WHITE]|board->colour[BLACK]), sq) & (board->colour[side] & board->pieces[BISHOPS])) {return BISHOPS;}
// Rooks
if(magic_moves_rook((board->colour[WHITE]|board->colour[BLACK]), sq) & (board->colour[side] & board->pieces[ROOKS])) {return ROOKS;}
// Queens
if(magic_moves_bishop((board->colour[WHITE]|board->colour[BLACK]), sq) & (board->colour[side] & board->pieces[QUEENS])) {return QUEENS;}
if(magic_moves_rook((board->colour[WHITE]|board->colour[BLACK]), sq) & (board->colour[side] & board->pieces[QUEENS])) {return QUEENS;}
// King
if(magic_moves_king(sq) & board->pieces[KINGS] & board->colour[side]) {return KINGS;}
return EMPTY;
}
int square_attacked(s_board *board, uint64_t pos, int side)
{
assert(board != NULL);
assert(pos);
assert(side == WHITE || side == BLACK);
int sq = __builtin_ctzll(pos);
// Pawns
if(magic_moves_pawns(1-side, sq) & board->pieces[PAWNS] & board->colour[side]) {return 1;}
// Knights
if((board->colour[side] & board->pieces[KNIGHTS]) & magic_moves_knight(sq)) {return 1;}
// Bishops & Queens
if(magic_moves_bishop((board->colour[WHITE]|board->colour[BLACK]), sq) & (board->colour[side] & (board->pieces[BISHOPS] | board->pieces[QUEENS]))) {return 1;}
// Rooks & Queens
if(magic_moves_rook((board->colour[WHITE]|board->colour[BLACK]), sq) & (board->colour[side] & (board->pieces[ROOKS] | board->pieces[QUEENS]))) {return 1;}
// King
if(magic_moves_king(sq) & board->pieces[KINGS] & board->colour[side]) {return 1;}
return 0;
}
int eval_attackers(s_board *board, uint64_t pos, int side)
{
assert(board != NULL);
assert(pos);
assert(side == WHITE || side == BLACK);
int eval = 0;
int sq = __builtin_ctzll(pos);
uint64_t attackers = 0;
// Pawns
attackers = board->colour[side] & board->pieces[PAWNS] & magic_moves_pawns(1-side, sq);
while(attackers)
{
eval += piece_value(PAWNS);
attackers &= 1-attackers;
}
// Knights
attackers = board->colour[side] & board->pieces[KNIGHTS] & magic_moves_knight(sq);
while(attackers)
{
eval += piece_value(KNIGHTS);
attackers &= 1-attackers;
}
// Bishops
attackers = magic_moves_bishop((board->colour[WHITE]|board->colour[BLACK]), sq) & board->colour[WHITE] & board->pieces[BISHOPS];
while(attackers)
{
eval += piece_value(BISHOPS);
attackers &= 1-attackers;
}
// Rooks
attackers = magic_moves_rook((board->colour[WHITE]|board->colour[BLACK]), sq) & board->colour[WHITE] & board->pieces[ROOKS];
while(attackers)
{
eval += piece_value(ROOKS);
attackers &= 1-attackers;
}
// Queens
attackers = magic_moves_bishop((board->colour[WHITE]|board->colour[BLACK]), sq) & board->colour[WHITE] & board->pieces[QUEENS];
attackers |= magic_moves_rook((board->colour[WHITE]|board->colour[BLACK]), sq) & board->colour[WHITE] & board->pieces[QUEENS];
while(attackers)
{
eval += piece_value(QUEENS);
attackers &= 1-attackers;
}
return eval;
}
