/// <summary>
/// Localize and return poosition of king on board
/// </summary>
/// <param name="board"></param>
/// <param name="kingColor"></param>
/// <returns>position of king</returns>
private static Position FindKing(ChessBoard board, ChessEnum.Color kingColor)
{
Position pos;
for (int i = 0; i <= 7; i++)
{
for (int j = 0; j <= 7; j++)
{
pos = new Position(i, j);
if (!board.IsSquareEmpty(pos) && board.GetPieceFromPosition(pos).figure == Figure.King && board.GetPieceFromPosition(pos).color == kingColor)
{
return(pos);
}
}
}
return(null);
}
/// <summary>
/// searches for a tie on the basis of non-existing check and number of available moves
/// </summary>
/// <returns>true, when there is no check and one side has no possible moves,
/// false in every other situation </returns>
private bool DoesTieExist()
{
//converting actual chessboard to chessboard type:
#region conversion
Debug.Log("Searching for CheckMate");
ChessPiece[,] board = new ChessPiece[8, 8];
var sq = unityBoard.gameObject.GetComponent <UnityChessBoard>().squares;
var currentPiece = GetComponent <UnityChessPiece>();
var currentSquare = currentPiece.square.name;
didMove = currentPiece.didmove;
var currentPos = new Position(currentSquare[0] - 'A', currentSquare[1] - '1');
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
var localSquare = sq[i, j].GetComponent <ChessSquare>();
var localFigure = localSquare.figure;
if (localFigure != null)
{
var color = ChessEnum.Color.Black;
////Debug.Log($"name is {localFigure.name}");
if (localFigure.name.Contains("White"))
{
color = ChessEnum.Color.White;
}
board[i, j] = new ChessPiece(localFigure.figure, color, localFigure.didmove, localSquare.enPassantPossible);
// //Debug.Log($"({i},{j})={board[i, j].figure},{color}");
}
else
{
board[i, j] = null;
////Debug.Log($"({i},{j})=null");
}
}
}
ChessBoard chessBoard = new ChessBoard(board);
//arranging array of pieces on board and corresponding positions
GameObject[] pieces = GameObject.FindGameObjectsWithTag("Chess Piece");
List <Position> positionsOfPieces = new List <Position>();
UnityChessPiece[] figures = new UnityChessPiece[pieces.Length];
for (int i = 0; i < pieces.Length; i++)
{
figures[i] = pieces[i].GetComponent <UnityChessPiece>();
currentSquare = figures[i].square.name;
positionsOfPieces.Add(new Position(currentSquare[0] - 'A', currentSquare[1] - '1'));
}
Position[] positions = positionsOfPieces.ToArray();
List <Position> defMoves = new List <Position>();
#endregion
turn = GameObject.FindGameObjectWithTag("Turn Order").GetComponent <Turns>().turn;
Debug.Log(turn);
if (!DoesCheckExist(chessBoard, FindKing(chessBoard, ChessEnum.Color.White)) && turn == ChessEnum.Color.White)
{
for (int i = 0; i < figures.Length; i++)
{
UnityChessPiece piece = figures[i].GetComponent <UnityChessPiece>();
if (piece.color == ChessEnum.Color.White)
{
switch (figures[i].figure)
{
case Figure.Pawn:
defMoves = PossibleMovesPawn(chessBoard, positions[i], didMove).ToList <Position>();
break;
case Figure.Knight:
defMoves = PossibleMovesKnight(chessBoard, positions[i], didMove).ToList <Position>();
break;
case Figure.Bishop:
defMoves = PossibleMovesBishop(chessBoard, positions[i], didMove).ToList <Position>();
break;
case Figure.Rook:
defMoves = PossibleMovesRook(chessBoard, positions[i], didMove).ToList <Position>();
break;
case Figure.Queen:
defMoves = PossibleMovesQueen(chessBoard, positions[i], didMove).ToList <Position>();
break;
case Figure.King:
defMoves = PossibleMovesKing(chessBoard, positions[i], didMove).ToList <Position>();
break;
}
if (defMoves.Count > 0)
{
return(false);
}
defMoves.Clear();
}
}
Debug.Log("white cannot move");
return(true); //a tie, no check and white cannot move
}
else if (!DoesCheckExist(chessBoard, FindKing(chessBoard, ChessEnum.Color.Black)) && turn == ChessEnum.Color.Black)
{
for (int i = 0; i < figures.Length; i++)
{
if (figures[i].color == ChessEnum.Color.Black)
{
switch (figures[i].figure)
{
case Figure.Pawn:
defMoves = PossibleMovesPawn(chessBoard, positions[i], didMove).ToList <Position>();
break;
case Figure.Knight:
defMoves = PossibleMovesKnight(chessBoard, positions[i], didMove).ToList <Position>();
break;
case Figure.Bishop:
defMoves = PossibleMovesBishop(chessBoard, positions[i], didMove).ToList <Position>();
break;
case Figure.Rook:
defMoves = PossibleMovesRook(chessBoard, positions[i], didMove).ToList <Position>();
break;
case Figure.Queen:
defMoves = PossibleMovesQueen(chessBoard, positions[i], didMove).ToList <Position>();
break;
case Figure.King:
defMoves = PossibleMovesKing(chessBoard, positions[i], didMove).ToList <Position>();
break;
}
if (defMoves.Count > 0)
{
return(false);
}
defMoves.Clear();
}
}
Debug.Log("black cannot move");
return(true); //a tie, (no check and black cant move)
}
else
{
return(false); //will never be reached
}
}
private void Start()
{
turn = ChessEnum.Color.Black;
}
