Bishops::Bishops()
: _moveMask({0x40201008040200LL, 0x402010080400LL, 0x4020100a00LL,
0x40221400LL, 0x2442800LL, 0x204085000LL, 0x20408102000LL,
0x2040810204000LL, 0x20100804020000LL, 0x40201008040000LL,
0x4020100a0000LL, 0x4022140000LL, 0x244280000LL,
0x20408500000LL, 0x2040810200000LL, 0x4081020400000LL,
0x10080402000200LL, 0x20100804000400LL, 0x4020100a000a00LL,
0x402214001400LL, 0x24428002800LL, 0x2040850005000LL,
0x4081020002000LL, 0x8102040004000LL, 0x8040200020400LL,
0x10080400040800LL, 0x20100a000a1000LL, 0x40221400142200LL,
0x2442800284400LL, 0x4085000500800LL, 0x8102000201000LL,
0x10204000402000LL, 0x4020002040800LL, 0x8040004081000LL,
0x100a000a102000LL, 0x22140014224000LL, 0x44280028440200LL,
0x8500050080400LL, 0x10200020100800LL, 0x20400040201000LL,
0x2000204081000LL, 0x4000408102000LL, 0xa000a10204000LL,
0x14001422400000LL, 0x28002844020000LL, 0x50005008040200LL,
0x20002010080400LL, 0x40004020100800LL, 0x20408102000LL,
0x40810204000LL, 0xa1020400000LL, 0x142240000000LL,
0x284402000000LL, 0x500804020000LL, 0x201008040200LL,
0x402010080400LL, 0x2040810204000LL, 0x4081020400000LL,
0xa102040000000LL, 0x14224000000000LL, 0x28440200000000LL,
0x50080402000000LL, 0x20100804020000LL, 0x40201008040200LL}),
_magicShift({58, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59, 59, 59, 59, 59,
59, 59, 59, 57, 57, 57, 57, 59, 59, 59, 59, 57, 55, 55, 57,
59, 59, 59, 59, 57, 55, 55, 57, 59, 59, 59, 59, 57, 57, 57,
57, 59, 59, 59, 59, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59,
59, 59, 59, 58}),
_magicNumber(
{0x450010148020840LL, 0x10048100420000LL, 0x4010401080008LL,
0x9040300400004LL, 0x2408484010000004LL, 0x1112010480100LL,
0x400420211410800LL, 0x808400a00400LL, 0x5001100410040050LL,
0x13820a1094128484LL, 0x208100086085000LL, 0x1044080849000830LL,
0x2020020210014040LL, 0xc210008804402801LL, 0x21008208024082LL,
0x620124010440LL, 0x40042008421081LL, 0x10292084288091LL,
0x20180990044010a1LL, 0x612002422020200LL, 0xa004422011021LL,
0x4025001201010168LL, 0x100200bc01410828LL, 0xa280206011408LL,
0x4282080020881010LL, 0x11040200a0a12LL, 0x1008880210044811LL,
0x4201080061004100LL, 0x8045011001014001LL, 0x25040100c4900090LL,
0x1041840440402LL, 0x10404240101090cLL, 0xa101268402e80LL,
0x8008a82800610200LL, 0x3081004808810800LL, 0x2004040140101LL,
0x1001010400020020LL, 0x100808300020120LL, 0x1830020608006100LL,
0x80120c2620510080LL, 0x80013010ec401010LL, 0x11043002004404LL,
0xa001001802000404LL, 0x4420216000400LL, 0x402200a002500LL,
0x404010010040420aLL, 0x8100106088440LL, 0x2041402310080LL,
0x614040213300000LL, 0x40809404092c0840LL, 0x680002020092220eLL,
0x80020020881200LL, 0x380041002022005LL, 0x2080328220100LL,
0xa028883004007010LL, 0x40020802248a0000LL, 0x245004802480200LL,
0x1102604108288202LL, 0xc24020902882400LL, 0x2080080941400LL,
0x12080011020200LL, 0x80040820200d3241LL, 0x1502410108a00LL,
0x1020421008408481LL}),
_data(nullptr) {
_data = new BitBoard[5248];
size_t squareIndex = 0;
for (Square square = 0; square < 64; ++square) {
_magicAttacks[square] = _data + squareIndex;
squareIndex += (1 << (64 - _magicShift[square]));
for (BitBoard occupied : genOccupancyVariations(square)) {
BitBoard bishops(1LL << square);
BitBoard neAttacks = shiftNE(smearNE(bishops, ~occupied));
BitBoard seAttacks = shiftSE(smearSE(bishops, ~occupied));
BitBoard swAttacks = shiftSW(smearSW(bishops, ~occupied));
BitBoard nwAttacks = shiftNW(smearNW(bishops, ~occupied));
BitBoard attacks = neAttacks | seAttacks | swAttacks | nwAttacks;
BitBoard blockers(occupied & _moveMask[square]);
unsigned int index((blockers * _magicNumber[square]) >>
_magicShift[square]);
*(_magicAttacks[square] + index) = attacks;
}
}
}
U64 wPawnAttacksNE(){ return shiftNE(pieces[WHITE] & pieces[PAWN]); }
U64 knightNEE(){ return shiftNE(shiftE(pieces[KNIGHT])); }
bool_t testInCheck( board_t *b )
{
color_t oppColor = (b->toMove == BLACK ? WHITE : BLACK);
BB oppOrthogSliders = b->colors[oppColor] & (b->pieces[QUEEN] | b->pieces[ROOK] );
BB oppDiagSliders = b->colors[oppColor] & (b->pieces[QUEEN] | b->pieces[BISHOP]);
BB oppKnights = b->colors[oppColor] & b->pieces[KNIGHT];
BB oppPawns = b->colors[oppColor] & b->pieces[PAWN];
BB onMoveKing = b->colors[b->toMove] & b->pieces[KING];
BB empty = ~(b->colors[WHITE] | b->colors[BLACK]);
BB oppOrthoAttacks = 0;
BB oppDiagAttacks = 0;
BB oppKnightAttacks = 0;
BB oppPawnAttacks = 0;
// Rooks and Queens
if(oppOrthogSliders)
{
oppOrthoAttacks = Sattacks(oppOrthogSliders, empty) |
Nattacks(oppOrthogSliders, empty) |
Eattacks(oppOrthogSliders, empty) |
Wattacks(oppOrthogSliders, empty);
}
// Bishops and Queens
if(oppDiagSliders)
{
oppDiagAttacks = SEattacks(oppDiagSliders, empty) |
SWattacks(oppDiagSliders, empty) |
NEattacks(oppDiagSliders, empty) |
NWattacks(oppDiagSliders, empty);
}
// Knights
while(oppKnights)
{
oppKnightAttacks |= knightCoverage[63 - getLSBindex(oppKnights)];
clearlsb(oppKnights);
}
// Pawns
if(oppPawns)
{
if(b->toMove == WHITE)
{
oppPawnAttacks = shiftSE(oppPawns) | shiftSW(oppPawns);
}
else
{
oppPawnAttacks = shiftNE(oppPawns) | shiftNW(oppPawns);
}
}
// If any of these attacks reach our king, we are in check...
if( onMoveKing & (oppOrthoAttacks | oppDiagAttacks | oppKnightAttacks | oppPawnAttacks) )
{
return TRUE;
}
else
{
return FALSE;
}
}
