ChessDotNet.ChessGame.UseGameCreationData C# (CSharp) Method

        protected virtual void UseGameCreationData(GameCreationData data)
        {
            Board = CloneBoard(data.Board);
            WhoseTurn = data.WhoseTurn;
            Piece e1 = GetPieceAt(File.E, 1);
            Piece e8 = GetPieceAt(File.E, 8);
            Piece a1 = GetPieceAt(File.A, 1);
            Piece h1 = GetPieceAt(File.H, 1);
            Piece a8 = GetPieceAt(File.A, 8);
            Piece h8 = GetPieceAt(File.H, 8);
            CanBlackCastleKingSide = CanBlackCastleQueenSide = CanWhiteCastleKingSide = CanWhiteCastleQueenSide = CastlingCanBeLegal;
            if (CastlingCanBeLegal)
            {
                if (!(e1 is King) || e1.Owner != Player.White)
                    CanWhiteCastleKingSide = CanWhiteCastleQueenSide = false;
                if (!(e8 is King) || e8.Owner != Player.Black)
                    CanBlackCastleKingSide = CanBlackCastleQueenSide = false;
                if (!(a1 is Rook) || a1.Owner != Player.White || !data.CanWhiteCastleQueenSide)
                    CanWhiteCastleQueenSide = false;
                if (!(h1 is Rook) || h1.Owner != Player.White || !data.CanWhiteCastleKingSide)
                    CanWhiteCastleKingSide = false;
                if (!(a8 is Rook) || a8.Owner != Player.Black || !data.CanBlackCastleQueenSide)
                    CanBlackCastleQueenSide = false;
                if (!(h8 is Rook) || h8.Owner != Player.Black || !data.CanBlackCastleKingSide)
                    CanBlackCastleKingSide = false;
            }

            if (data.EnPassant != null)
            {
                DetailedMove latestMove = new DetailedMove(new Move(new Position(data.EnPassant.File, data.WhoseTurn == Player.White ? 7 : 2),
                                                                    new Position(data.EnPassant.File, data.WhoseTurn == Player.White ? 5 : 4),
                                                                    ChessUtilities.GetOpponentOf(data.WhoseTurn)),
                                          new Pawn(ChessUtilities.GetOpponentOf(data.WhoseTurn)),
                                          false,
                                          CastlingType.None);
                _moves.Add(latestMove);
            }

            _halfMoveClock = data.HalfMoveClock;
            _fullMoveNumber = data.FullMoveNumber;
        }