public static bool AddIfCoordinateIsEmpty(this List <GameMove> list, Chessboard chessboard, GameMove move)
{
if (chessboard.GetChessPieceOrDefault(move.To).HasValue)
{
return(false);
}
list.Add(move);
return(true);
}
private bool IsValid(Chessboard chessboard, GameMove move, GameHistory gameHistory)
{
var chessPiece = chessboard.GetChessPieceOrDefault(move.From);
if (!chessPiece.HasValue)
{
return(false);
}
var chessBoardCopy = (Chessboard)chessboard.Clone();
var gameHistoryCopy = (GameHistory)gameHistory.Clone();
gameHistoryCopy.Add(move, chessPiece.Value.Owner, chessBoardCopy);
chessBoardCopy.Move(move);
var kingCoordinate = chessBoardCopy.GetCoordinate(new ChessPiece {
Owner = chessPiece.Value.Owner, Type = ChessPieceType.King
});
var isKingInDanger = IsCoordinateInDanger(chessBoardCopy, chessPiece.Value.Owner, gameHistoryCopy, kingCoordinate);
return(!isKingInDanger);
}
private static bool IsPawnKilling(Chessboard chessboard, GameMove?previousMove, ChessColor chessPieceColor, int i, int j)
{
var chessPieceOnPotentialVictimPosition = chessboard.Board[i, j];
if (chessPieceOnPotentialVictimPosition.HasValue)
{
return(chessPieceOnPotentialVictimPosition.Value.Owner != chessPieceColor);
}
// "En Passant" checking
if (!previousMove.HasValue ||
chessPieceColor == ChessColor.White && i != 5 ||
chessPieceColor == ChessColor.Black && i != 2)
{
return(false);
}
var previousMoveChessPiece = chessboard.GetChessPieceOrDefault(previousMove.Value.To);
if (!previousMoveChessPiece.HasValue || previousMoveChessPiece.Value.Type != ChessPieceType.Pawn)
{
return(false);
}
previousMove.Value.From.ToArrayIndexes(out var prevMoveFromI, out var prevMoveFromJ);
previousMove.Value.To.ToArrayIndexes(out var prevMoveToI, out _);
var prevMoveOwner = previousMoveChessPiece.Value.Owner;
if (prevMoveFromJ != j)
{
return(false);
}
return(prevMoveOwner == ChessColor.White && prevMoveFromI == 1 && prevMoveToI == 3 ||
prevMoveOwner == ChessColor.Black && prevMoveFromI == 6 && prevMoveToI == 4);
}