public int EvaluateSlidingPiece(Position position, int color, int pieceType, int materialValue, int mobilityMultiplier, ref Bitboard destinationBitboard)
{
Bitboard pieces = position.GetPieceBitboard(color, pieceType);
int score = 0;
while (pieces != 0)
{
score += materialValue;
int square = pieces.BitScanForward();
Bitboards.PopLsb(ref pieces);
Bitboard attacks = 0;
if (pieceType == Position.ROOK || pieceType == Position.QUEEN)
{
attacks = Bitboards.GetRookMoveBitboard(square, position.AllPiecesBitboard);
}
if (pieceType == Position.BISHOP || pieceType == Position.QUEEN)
{
attacks |= Bitboards.GetBishopMoveBitboard(square, position.AllPiecesBitboard);
}
attacks &= destinationBitboard;
score += Bitboards.CountBits(attacks) * mobilityMultiplier;
}
return(score);
}
public void CalculatesCorrectly()
{
Bitboard occupancyBitboard = 0x780B2201E661F5UL;
int square = Position.D3;
Assert.AreEqual(0x824428002804UL, Bitboards.GetBishopMoveBitboard(square, occupancyBitboard));
occupancyBitboard = 0x2103A24FEA64C6D8UL;
square = Position.A1;
Assert.AreEqual(0x4000UL, Bitboards.GetBishopMoveBitboard(square, occupancyBitboard));
occupancyBitboard = 0x356A829C31CABB6AUL;
square = Position.D5;
Assert.AreEqual(0x244280028040200UL, Bitboards.GetBishopMoveBitboard(square, occupancyBitboard));
}