/// <summary>
/// Calculates a position evaluation result for the specified parameters.
/// </summary>
/// <param name="bitboard">The bitboard.</param>
/// <param name="color">The player color.</param>
/// <param name="pieceType">The piece type.</param>
/// <param name="piecesToParse">The pieces to parse.</param>
/// <returns>The position evaluation result.</returns>
private int GetPositionValue(Bitboard bitboard, Color color, PieceType pieceType, ulong piecesToParse)
{
var position = 0;
var array = PositionValues.GetValues(color, bitboard.GamePhase, pieceType);
while (piecesToParse != 0)
{
var pieceLSB = BitOperations.GetLSB(piecesToParse);
piecesToParse = BitOperations.PopLSB(piecesToParse);
var pieceIndex = BitOperations.GetBitIndex(pieceLSB);
position += array[pieceIndex];
}
return(position);
}
/// <summary>
/// Calculates a new position evaluation result based on the value of the removed piece and its position.
/// </summary>
/// <param name="bitboard">The bitboard.</param>
/// <param name="color">The piece color.</param>
/// <param name="pieceType">The piece type.</param>
/// <param name="piece">The piece bit.</param>
public static void RemovePiece(Bitboard bitboard, Color color, PieceType pieceType, ulong piece)
{
var pieceIndex = BitOperations.GetBitIndex(piece);
var array = PositionValues.GetValues(color, bitboard.GamePhase, pieceType);
var delta = array[pieceIndex];
switch (color)
{
case Color.White:
{
bitboard.IncEvaluation.Position -= delta;
break;
}
case Color.Black:
{
bitboard.IncEvaluation.Position += delta;
break;
}
}
}