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pawn.cpp
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pawn.cpp
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// Zugzwang Chess Engine - stage 2
#include "pawn.h"
BITBOARD Pawn::pawnAttacks(int pos, bool isWhite) {
BITBOARD res = 0LL;
if (isWhite) {
if (pos % 8 == 0) {
res = 1ULL << (pos + 9);
} else if (pos % 8 == 7) {
res = 1ULL << (pos + 7);
} else {
res = (1ULL << (pos + 9)) | (1ULL << (pos + 7));
}
} else {
if (pos % 8 == 0) {
res = 1ULL << (pos - 7);
} else if (pos % 8 == 7) {
res = 1ULL << (pos - 9);
} else {
res = (1ULL << (pos - 9)) | (1ULL << (pos - 7));
}
}
return res;
}
BITBOARD Pawn::pawnMove(int pos, bool isWhite) {
BITBOARD res = 0ULL;
if (isWhite) {
res |= 1ULL << (pos + 8);
if (8 <= pos && pos <= 15) {
res |= 1ULL << (pos + 16);
}
} else {
res |= 1ULL << (pos - 8);
if (48 <= pos && pos <= 55) {
res |= 1ULL << (pos - 16);
}
}
return res;
}