public IEnumerable <IMove> GetLegalMoves(ushort squareIndex, ulong[][] occupancy, ushort?enPassantIdx,
CastlingAvailability castlingAvailability)
{
var pieceOfColor = occupancy.GetPieceOfColorAtIndex(squareIndex);
if (pieceOfColor == null)
{
yield break;
}
var piece = pieceOfColor.Value.Piece;
var color = pieceOfColor.Value.Color;
var relevantOccupancy = occupancy.Occupancy();
if (piece == Piece.Pawn && enPassantIdx.HasValue)
{
var epValue = enPassantIdx.Value.GetBoardValueOfIndex();
relevantOccupancy |= epValue;
}
var pseudoLegalMoves = GetPseudoLegalMoves(squareIndex, piece, color, relevantOccupancy);
var moves = new List <IMove>();
foreach (var destinationIndex in pseudoLegalMoves.GetSetBits())
{
var moveType = BoardHelpers.GetMoveType(occupancy, squareIndex, destinationIndex, enPassantIdx);
var move = MoveHelpers.GenerateMove(squareIndex, destinationIndex, moveType);
moves.Add(move);
}
if (piece == Piece.King && IsKingSquare(squareIndex, color))
{
moves.AddRange(GetPseudoLegalCastlingMoves(color, castlingAvailability));
}
foreach (var move in moves)
{
var moveValidator =
new MoveValidator(
new Board(occupancy, 0, enPassantIdx, null, castlingAvailability, color, 0, true),
move);
var validationResult = moveValidator.Validate();
if (validationResult == MoveError.NoneSet)
{
yield return(move);
}
}
}
public MoveType GetMoveTypeTest(Board board, ushort from, ushort to, ushort?epIndex)
{
return(BoardHelpers.GetMoveType(board.Occupancy, (ushort)@from,
(ushort)to, (ushort?)epIndex));
}