private static bool CanMakeEnPassantMove(Piece pieceToMove, ChessMoveStepInfo lastMoveStep, Piece pieceOnTheSide)
{
return(!pieceOnTheSide.IsNone() &&
pieceOnTheSide.Type == PieceType.Pawn &&
pieceOnTheSide.Player != pieceToMove.Player &&
pieceOnTheSide.NumberOfPlayedMoves == 1 &&
lastMoveStep.NewPosition.Equals(pieceOnTheSide.Position) &&
Math.Abs((int)lastMoveStep.OldPosition.VerticalPosition - (int)lastMoveStep.NewPosition.VerticalPosition) == 2);
}
private static List <ChessMoveInfo> GetCastlingMoves(ChessBoard board, Piece kingPiece)
{
var moves = new List <ChessMoveInfo>();
var verticalPosition = kingPiece.Position.VerticalPosition;
var shortCastlingRookPosition = new PiecePosition(PieceHorizontalPosition.P_H, verticalPosition);
var shortCastlingRookPiece = board.GetPiece(shortCastlingRookPosition);
var canDoShortCastling = CanDoCastling(board, kingPiece, shortCastlingRookPiece);
if (canDoShortCastling)
{
var newRookPosition = new PiecePosition(PieceHorizontalPosition.P_F, verticalPosition);
var newKingPosition = new PiecePosition(PieceHorizontalPosition.P_G, verticalPosition);
var firstMoveStep = new ChessMoveStepInfo(shortCastlingRookPosition, newRookPosition, shortCastlingRookPiece);
var secondMoveStep = new ChessMoveStepInfo(kingPiece.Position, newKingPosition, kingPiece);
var steps = new List <ChessMoveStepInfo> {
firstMoveStep, secondMoveStep
};
var move = new ChessMoveInfo(kingPiece.Player, steps, false, isCastling: true);
moves.Add(move);
}
var longCastlingRookPosition = new PiecePosition(PieceHorizontalPosition.P_A, verticalPosition);
var longCastlingRookPiece = board.GetPiece(longCastlingRookPosition);
var canDoLongCastling = CanDoCastling(board, kingPiece, longCastlingRookPiece);
if (canDoLongCastling)
{
var newRookPosition = new PiecePosition(PieceHorizontalPosition.P_D, verticalPosition);
var newKingPosition = new PiecePosition(PieceHorizontalPosition.P_C, verticalPosition);
var firstMoveStep = new ChessMoveStepInfo(longCastlingRookPosition, newRookPosition, longCastlingRookPiece);
var secondMoveStep = new ChessMoveStepInfo(kingPiece.Position, newKingPosition, kingPiece);
var steps = new List <ChessMoveStepInfo> {
firstMoveStep, secondMoveStep
};
var move = new ChessMoveInfo(kingPiece.Player, steps, false, isCastling: true);
moves.Add(move);
}
return(moves);
}
