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 = 0x2C479CB67DA469UL;
int square = Position.G1;
Assert.AreEqual(0x202020DUL, Bitboards.GetRookMoveBitboard(square, occupancyBitboard));
occupancyBitboard = 0xC5C100D915991UL;
square = Position.B4;
Assert.AreEqual(0x4040B8404000UL, Bitboards.GetRookMoveBitboard(square, occupancyBitboard));
occupancyBitboard = 0;
square = Position.E8;
Assert.AreEqual(0xF708080808080808UL, Bitboards.GetRookMoveBitboard(square, occupancyBitboard));
}