public bool ValidatePosition()
{
Board board = m_editBoard;
BoardState state = board.State;
//----Validating piece count----
byte K = 0; //white kings
byte k = 0; //black kings
byte Q = 0; //white queens
byte q = 0; //black queens
byte R = 0; //white rooks
byte r = 0; //black rooks
byte B = 0; //white bishops
byte b = 0; //black bishops
byte N = 0; //white knights
byte n = 0; //black knights
byte P = 0; //white pawns
byte p = 0; //black pawns
foreach (Square square in board)
{
if (board[square] == Piece.WhiteKing)
{
++K;
}
if (board[square] == Piece.BlackKing)
{
++k;
}
if (board[square] == Piece.WhiteQueen)
{
++Q;
}
if (board[square] == Piece.BlackQueen)
{
++q;
}
if (board[square] == Piece.WhiteRook)
{
++R;
}
if (board[square] == Piece.BlackRook)
{
++r;
}
if (board[square] == Piece.WhiteBishop)
{
++B;
}
if (board[square] == Piece.BlackBishop)
{
++b;
}
if (board[square] == Piece.WhiteKnight)
{
++N;
}
if (board[square] == Piece.BlackKnight)
{
++n;
}
if (board[square] == Piece.WhitePawn)
{
++P;
}
if (board[square] == Piece.BlackPawn)
{
++p;
}
}
if ((K + Q + R + B + N + P) > 16 || (k + q + r + b + n + p) > 16) //total
{
return(false);
}
if (K != 1 || k != 1) //kings
{
return(false);
}
if (P > 8 || p > 8) //pawns
{
return(false);
}
if ((Q + R + B + N - 7) > (8 - P) || (q + r + b + n - 7) > (8 - p)) //ekstra due to promotion
{
return(false);
}
//----Validate color to play----
if (!(state.ColorToPlay == PieceColor.White || state.ColorToPlay == PieceColor.Black))
{
return(false);
}
//----Validate pawn locations----
for (Square square = Square.A1; square <= Square.H1; ++square)
{
Piece piece = board[square];
if (piece == Piece.WhitePawn || piece == Piece.BlackPawn)
{
return(false);
}
}
for (Square square = Square.A8; square <= Square.H8; ++square)
{
Piece piece = board[square];
if (piece == Piece.WhitePawn || piece == Piece.BlackPawn)
{
return(false);
}
}
//----Validating if a king can be captured----
if (state.ColorToPlay == PieceColor.White)
{
if (board.IsCheck(PieceColor.Black))
{
return(false);
}
}
if (state.ColorToPlay == PieceColor.Black)
{
if (board.IsCheck(PieceColor.White))
{
return(false);
}
}
//----Validating En Passant----
if (state.EnPassantTarget != Square.None)
{
if (!(Board.Rank(state.EnPassantTarget) == 3 || Board.Rank(state.EnPassantTarget) == 4))
{
return(false);
}
if (state.ColorToPlay == PieceColor.White && board[state.EnPassantTarget] != Piece.BlackPawn)
{
return(false);
}
if (state.ColorToPlay == PieceColor.Black && board[state.EnPassantTarget] != Piece.WhitePawn)
{
return(false);
}
}
//----Validating castling----
if (state.WhiteCanCastleShort)
{
if (board[Square.E1] != Piece.WhiteKing || board[Square.H1] != Piece.WhiteRook)
{
return(false);
}
}
if (state.WhiteCanCastleLong)
{
if (board[Square.E1] != Piece.WhiteKing || board[Square.A1] != Piece.WhiteRook)
{
return(false);
}
}
if (state.BlackCanCastleShort)
{
if (board[Square.E8] != Piece.BlackKing || board[Square.H8] != Piece.BlackRook)
{
return(false);
}
}
if (state.BlackCanCastleLong)
{
if (board[Square.E8] != Piece.BlackKing || board[Square.A8] != Piece.BlackRook)
{
return(false);
}
}
return(true);
}
