void MoveList::GenCheckEvasions(const Position& pos)
{
Clear();
COLOR side = pos.Side();
COLOR opp = side ^ 1;
U64 freeOrOpp = ~pos.BitsAll(side);
U64 occ = pos.BitsAll();
U64 x, y;
FLD from, to;
PIECE piece, captured;
FLD K = pos.King(side);
U64 attackers = pos.GetAttacks(K, opp, occ);
U64 mask = attackers;
while (attackers)
{
from = PopLSB(attackers);
mask |= BB_BETWEEN[from][K];
}
int fwd = -8 + 16 * side;
int second = 6 - 5 * side;
int seventh = 1 + 5 * side;
piece = PW | side;
x = pos.Bits(piece);
while (x)
{
from = PopLSB(x);
int row = Row(from);
to = static_cast<FLD>(from + fwd);
if (!pos[to])
{
if (row == second)
{
if (BB_SINGLE[to] & mask)
Add(from, to, piece);
to = static_cast<FLD>(to + fwd);
if (!pos[to])
{
if (BB_SINGLE[to] & mask)
Add(from, to, piece);
}
}
else if (row == seventh)
{
if (BB_SINGLE[to] & mask)
{
Add(from, to, piece, NOPIECE, QW | side);
Add(from, to, piece, NOPIECE, RW | side);
Add(from, to, piece, NOPIECE, BW | side);
Add(from, to, piece, NOPIECE, NW | side);
}
}
else
{
if (BB_SINGLE[to] & mask)
Add(from, to, piece);
}
}
y = BB_PAWN_ATTACKS[from][side] & pos.BitsAll(opp) & mask;
while (y)
{
to = PopLSB(y);
captured = pos[to];
if (row == seventh)
{
Add(from, to, piece, captured, QW | side);
Add(from, to, piece, captured, RW | side);
Add(from, to, piece, captured, BW | side);
Add(from, to, piece, captured, NW | side);
}
else
Add(from, to, piece, captured);
}
}
to = pos.Ep();
if (to != NF)
{
y = BB_PAWN_ATTACKS[to][opp] & pos.Bits(PW | side);
while (y)
{
from = PopLSB(y);
Add(from, to, piece, PW | opp);
}
}
piece = NW | side;
x = pos.Bits(piece);
while (x)
{
from = PopLSB(x);
y = BB_KNIGHT_ATTACKS[from] & freeOrOpp & mask;
while (y)
{
to = PopLSB(y);
captured = pos[to];
Add(from, to, piece, captured);
}
}
piece = BW | side;
x = pos.Bits(piece);
while (x)
{
from = PopLSB(x);
y = BishopAttacks(from, occ) & freeOrOpp & mask;
while (y)
{
to = PopLSB(y);
captured = pos[to];
Add(from, to, piece, captured);
}
}
piece = RW | side;
x = pos.Bits(piece);
while (x)
{
from = PopLSB(x);
y = RookAttacks(from, occ) & freeOrOpp & mask;
while (y)
{
to = PopLSB(y);
captured = pos[to];
Add(from, to, piece, captured);
}
}
piece = QW | side;
x = pos.Bits(piece);
while (x)
{
from = PopLSB(x);
y = QueenAttacks(from, occ) & freeOrOpp & mask;
while (y)
{
to = PopLSB(y);
captured = pos[to];
Add(from, to, piece, captured);
}
}
piece = KW | side;
x = pos.Bits(piece);
while (x)
{
from = PopLSB(x);
y = BB_KING_ATTACKS[from] & freeOrOpp;
while (y)
{
to = PopLSB(y);
if (!pos.IsAttacked(to, opp))
{
captured = pos[to];
Add(from, to, piece, captured);
}
}
}
}
void MoveList::GenCheckEvasions(const Position& pos)
{
Clear();
COLOR side = pos.Side();
COLOR opp = side ^ 1;
U64 freeOrOpp = ~pos.BitsAll(side);
U64 occ = pos.BitsAll();
U64 x, y;
FLD from, to;
PIECE piece, captured;
FLD K = pos.King(side);
U64 attackers = pos.GetAttacks(K, opp, occ);
U64 mask = attackers;
while (attackers)
{
from = Bitboard::PopLSB(attackers);
mask |= Bitboard::Between(from, K);
}
int fwd = -8 + 16 * side;
int second = 6 - 5 * side;
int seventh = 1 + 5 * side;
piece = PW | side;
x = pos.Bits(piece);
while (x)
{
from = Bitboard::PopLSB(x);
int row = Row(from);
to = static_cast<FLD>(from + fwd);
if (!pos[to])
{
if (row == second)
{
if (Bitboard::Single(to) & mask)
Add(from, to, piece);
to = static_cast<FLD>(to + fwd);
if (!pos[to])
{
if (Bitboard::Single(to) & mask)
Add(from, to, piece);
}
}
else if (row == seventh)
{
if (Bitboard::Single(to) & mask)
{
Add(from, to, piece, NOPIECE, QW | side);
Add(from, to, piece, NOPIECE, RW | side);
Add(from, to, piece, NOPIECE, BW | side);
Add(from, to, piece, NOPIECE, NW | side);
}
}
else
{
if (Bitboard::Single(to) & mask)
Add(from, to, piece);
}
}
y = Bitboard::PawnAttacks(from, side) & pos.BitsAll(opp) & mask;
while (y)
{
to = Bitboard::PopLSB(y);
captured = pos[to];
if (row == seventh)
{
Add(from, to, piece, captured, QW | side);
Add(from, to, piece, captured, RW | side);
Add(from, to, piece, captured, BW | side);
Add(from, to, piece, captured, NW | side);
}
else
Add(from, to, piece, captured);
}
}
to = pos.Ep();
if (to != NF)
{
y = Bitboard::PawnAttacks(to, opp) & pos.Bits(PW | side);
while (y)
{
from = Bitboard::PopLSB(y);
Add(from, to, piece, PW | opp);
}
}
piece = NW | side;
x = pos.Bits(piece);
while (x)
{
from = Bitboard::PopLSB(x);
y = Bitboard::KnightAttacks(from) & freeOrOpp & mask;
while (y)
{
to = Bitboard::PopLSB(y);
captured = pos[to];
Add(from, to, piece, captured);
}
}
piece = BW | side;
x = pos.Bits(piece);
while (x)
{
from = Bitboard::PopLSB(x);
y = Bitboard::BishopAttacks(from, occ) & freeOrOpp & mask;
while (y)
{
to = Bitboard::PopLSB(y);
captured = pos[to];
Add(from, to, piece, captured);
}
}
piece = RW | side;
x = pos.Bits(piece);
while (x)
{
from = Bitboard::PopLSB(x);
y = Bitboard::RookAttacks(from, occ) & freeOrOpp & mask;
while (y)
{
to = Bitboard::PopLSB(y);
captured = pos[to];
Add(from, to, piece, captured);
}
}
piece = QW | side;
x = pos.Bits(piece);
while (x)
{
from = Bitboard::PopLSB(x);
y = Bitboard::QueenAttacks(from, occ) & freeOrOpp & mask;
while (y)
{
to = Bitboard::PopLSB(y);
captured = pos[to];
Add(from, to, piece, captured);
}
}
piece = KW | side;
x = pos.Bits(piece);
while (x)
{
from = Bitboard::PopLSB(x);
y = Bitboard::KingAttacks(from) & freeOrOpp;
while (y)
{
to = Bitboard::PopLSB(y);
if (!pos.IsAttacked(to, opp))
{
captured = pos[to];
Add(from, to, piece, captured);
}
}
}
}