public static WorthInPawn CalcWorthInPawns(this BoardSetup board)
{
var res = new WorthInPawn();
for (int f = 0; f < 8; f++)
{
for (int r = 0; r < 8; r++)
{
var p = board[f, r];
if (p == null)
{
continue;
}
if (p.Color == Color.White)
{
res.White += p.PieceType.WorthInPawns();
}
else
{
res.Black += p.PieceType.WorthInPawns();
}
}
}
return(res);
}
public static Move[] ValidateMove(this BoardSetup board, Move move)
{
if (move.Type == MoveType.CastleKingSide || move.Type == MoveType.CastleQueenSide)
{
return(MoveHelper.ValidateCastle(move, board));
}
else
{
switch (move.Piece)
{
case PieceType.Pawn:
return(new[] { MoveHelper.ValidatePawnMove(move, board) });
case PieceType.Knight:
return(new[] { MoveHelper.ValidateKnightMove(move, board) });
case PieceType.Bishop:
return(new[] { MoveHelper.ValidateBishopMove(move, board) });
case PieceType.Rook:
return(new[] { MoveHelper.ValidateRookMove(move, board) });
case PieceType.Queen:
return(new[] { MoveHelper.ValidateQueenMove(move, board) });
case PieceType.King:
return(new[] { MoveHelper.ValidateKingMove(move, board) });
default:
return(null);
}
}
}
public static Move[] ValidateCastle(Move move, BoardSetup board)
{
// Не проверяются битые поля на пути короля и то что ладья та самая
bool kingSide = move.Type == MoveType.CastleKingSide;
Color color = board.IsWhiteMove ? Color.White : Color.Black;
if (color == Color.White && (kingSide == true && board.CanWhiteCastleKingSide == false ||
kingSide == false && board.CanWhiteCastleQueenSide == false) ||
color == Color.Black && (kingSide == true && board.CanBlackCastleKingSide == false ||
kingSide == false && board.CanBlackCastleQueenSide == false))
{
throw new InvalidOperationException("This castling is no longer possible");
}
int df = kingSide ? 1 : -1;
int rank = board.IsWhiteMove ? 0 : 7;
for (int f = 0; f < 8; f++)
{
if (board[f, rank]?.PieceType == PieceType.King && board[f, rank]?.Color == color)
{
for (int i = 1; i < 6; i++)
{
int nf = f + i * df;
if (nf < 0 || nf > 7)
{
break;
}
if (board[nf, rank]?.PieceType == PieceType.Rook &&
board[nf, rank]?.Color == color)
{
var km = new Move();
km.Piece = PieceType.King;
km.Type = MoveType.Simple;
km.OriginSquare = new Square((File)(f + 1), rank + 1);
km.OriginFile = km.OriginSquare.File;
km.OriginRank = km.OriginSquare.Rank;
km.TargetSquare = kingSide ? new Square(File.G, rank + 1) : new Square(File.C, rank + 1);
km.TargetFile = km.TargetSquare.File;
var rm = new Move();
rm.Piece = PieceType.Rook;
rm.Type = MoveType.Simple;
rm.OriginSquare = new Square((File)(nf + 1), rank + 1);
rm.OriginFile = rm.OriginSquare.File;
rm.OriginRank = rm.OriginSquare.Rank;
rm.TargetSquare = kingSide ? new Square(File.F, rank + 1) : new Square(File.D, rank + 1);
rm.TargetFile = rm.TargetSquare.File;
return(new[] { km, rm });
}
else if (board[nf, rank] != null)
{
throw new InvalidOperationException("A figure interferes with castling");
}
}
break;
}
}
throw new InvalidOperationException("No castling rook found");
}
public static Move ValidatePawnMove(Move move, BoardSetup board)
{
var file = move.TargetSquare.File;
var rank = move.TargetSquare.Rank;
Color color = board.IsWhiteMove ? Color.White : Color.Black;
int direction = color == Color.White ? 1 : -1;
int pawnLine = color == Color.White ? 2 : 7;
var targetPiece = board[move.TargetSquare];
var ppc = move.PromotedPiece == null || (move.PromotedPiece != PieceType.King &&
move.PromotedPiece != PieceType.Pawn);
var isCorrectPawnArea = color == Color.White && rank >= 2 && rank <= 8 ||
color == Color.Black && rank >= 1 && rank <= 7;
var result = move.Clone();
if (move.Type == MoveType.Simple)
{
if (targetPiece == null && ppc && isCorrectPawnArea == false)
{
throw new InvalidOperationException();
}
if (board[file, rank - direction]?.PieceType == PieceType.Pawn && board[file, rank - direction]?.Color == color)
{
result.OriginFile = file;
result.OriginRank = rank - direction;
result.OriginSquare = new Square(result.OriginFile.Value, result.OriginRank.Value);
return(result);
}
else if (board[file, rank - direction] == null && board[file, rank - 2 * direction]?.PieceType == PieceType.Pawn &&
board[file, rank - 2 * direction]?.Color == color && rank - 2 * direction == pawnLine)
{
result.OriginFile = file;
result.OriginRank = rank - 2 * direction;
result.OriginSquare = new Square(result.OriginFile.Value, result.OriginRank.Value);
return(result);
}
}
else if (move.Type == MoveType.Capture)
{
if (ppc && targetPiece != null && color != targetPiece.Color && isCorrectPawnArea && move.OriginFile.HasValue == false)
{
throw new InvalidOperationException();
}
if (board[move.OriginFile.Value, rank - direction]?.Color == color &&
board[move.OriginFile.Value, rank - direction]?.PieceType == PieceType.Pawn)
{
result.OriginRank = rank - direction;
result.OriginSquare = new Square(result.OriginFile.Value, result.OriginRank.Value);
return(result);
}
}
else if (move.Type == MoveType.CaptureEnPassant)
{
throw new NotImplementedException();
}
throw new InvalidOperationException("No piece can make this move");
}
public static Move ValidateKingMove(Move move, BoardSetup board)
{
var asKing = ValidatePieceMove(move, board, PieceType.King, PieceType.King);
if (asKing == null)
{
throw new InvalidOperationException("No piece can make this move");
}
else
{
return(asKing);
}
}
/// <summary>
/// Start position for classic chess
/// </summary>
/// <returns></returns>
public static BoardSetup CreateDefault()
{
var b = new BoardSetup();
b[File.A, 1] = Piece.WhiteRook;
b[File.B, 1] = Piece.WhiteKnight;
b[File.C, 1] = Piece.WhiteBishop;
b[File.D, 1] = Piece.WhiteQueen;
b[File.E, 1] = Piece.WhiteKing;
b[File.F, 1] = Piece.WhiteBishop;
b[File.G, 1] = Piece.WhiteKnight;
b[File.H, 1] = Piece.WhiteRook;
b[File.A, 8] = Piece.BlackRook;
b[File.B, 8] = Piece.BlackKnight;
b[File.C, 8] = Piece.BlackBishop;
b[File.D, 8] = Piece.BlackQueen;
b[File.E, 8] = Piece.BlackKing;
b[File.F, 8] = Piece.BlackBishop;
b[File.G, 8] = Piece.BlackKnight;
b[File.H, 8] = Piece.BlackRook;
b[File.A, 2] = Piece.WhitePawn;
b[File.B, 2] = Piece.WhitePawn;
b[File.C, 2] = Piece.WhitePawn;
b[File.D, 2] = Piece.WhitePawn;
b[File.E, 2] = Piece.WhitePawn;
b[File.F, 2] = Piece.WhitePawn;
b[File.G, 2] = Piece.WhitePawn;
b[File.H, 2] = Piece.WhitePawn;
b[File.A, 7] = Piece.BlackPawn;
b[File.B, 7] = Piece.BlackPawn;
b[File.C, 7] = Piece.BlackPawn;
b[File.D, 7] = Piece.BlackPawn;
b[File.E, 7] = Piece.BlackPawn;
b[File.F, 7] = Piece.BlackPawn;
b[File.G, 7] = Piece.BlackPawn;
b[File.H, 7] = Piece.BlackPawn;
b.CanBlackCastleKingSide = true;
b.CanBlackCastleQueenSide = true;
b.CanWhiteCastleKingSide = true;
b.CanWhiteCastleQueenSide = true;
b.EnPassantSquare = null;
b.FullMoveCount = 1;
b.HalfMoveClock = 1;
b.IsWhiteMove = true;
return(b);
}
public static Move ValidateQueenMove(Move move, BoardSetup board)
{
var asRook = ValidatePieceMove(move, board, PieceType.Queen, PieceType.Rook);
var asBishop = ValidatePieceMove(move, board, PieceType.Queen, PieceType.Bishop);
if (asBishop == null && asRook == null)
{
throw new InvalidOperationException("No piece can make this move");
}
else
{
return(asRook ?? asBishop);
}
}
public static Position GoToMove(this Game game, int halfmove = int.MaxValue)
{
if (game.BoardSetup == null && game.Tags.ContainsKey("FEN") == false)
{
game.BoardSetup = BoardSetup.CreateDefault();
}
var board = game.BoardSetup.Clone();
int cnt = 0;
var sbMoves = new StringBuilder();
foreach (var move in game.MoveText.GetMoves())
{
cnt++;
var vmoves = board.ValidateMove(move);
if (vmoves != null)
{
foreach (var vmove in vmoves)
{
if (vmove.TargetSquare != null)
{
board[vmove.TargetSquare] = board[vmove.OriginSquare];
}
if (vmove.TargetSquare != vmove.OriginSquare)
{
board[vmove.OriginSquare] = null;
}
}
sbMoves.Append(vmoves.First().ToUciString());
sbMoves.Append(" ");
}
board.IsWhiteMove = !board.IsWhiteMove;
if (cnt >= halfmove)
{
break;
}
}
return(new Position
{
Board = board,
UciMoves = sbMoves.ToString(),
HalfMove = cnt
});
}
public static Move ValidateKnightMove(Move move, BoardSetup board)
{
var rank = move.TargetSquare.Rank - 1;
var ifile = (int)move.TargetSquare.File - 1;
Color color = board.IsWhiteMove ? Color.White : Color.Black;
var targetPieceNotKing = board[move.TargetSquare]?.PieceType != PieceType.King &&
board[move.TargetSquare]?.Color != color;
Func <int, int, bool> pieceCondition = (f, r) => Math.Abs(Math.Abs(ifile - f) - Math.Abs(rank - r)) == 1 &&
Math.Max(Math.Abs(ifile - f), Math.Abs(rank - r)) == 2;
Square original = null;
for (int f = 0; f < 8; f++)
{
for (int r = 0; r < 8; r++)
{
if (board[f, r]?.PieceType == PieceType.Knight && board[f, r]?.Color == color &&
pieceCondition(f, r) && targetPieceNotKing &&
(move.OriginRank == null || move.OriginRank == (r + 1)) &&
(move.OriginFile == null || move.OriginFile == (File)(f + 1)))
{
if (original == null)
{
original = new Square((File)(f + 1), r + 1);
}
else
{
throw new InvalidOperationException("More than one piece can make a given move");
}
}
}
}
if (original != null)
{
var result = move.Clone();
result.OriginSquare = original;
result.OriginFile = original.File;
result.OriginRank = original.Rank;
return(result);
}
throw new InvalidOperationException("No piece can make this move");
}
public BoardSetup Clone()
{
var b = new BoardSetup();
b.CanBlackCastleKingSide = this.CanBlackCastleKingSide;
b.CanBlackCastleQueenSide = this.CanBlackCastleQueenSide;
b.CanWhiteCastleKingSide = this.CanWhiteCastleKingSide;
b.CanWhiteCastleQueenSide = this.CanWhiteCastleQueenSide;
b.EnPassantSquare = this.EnPassantSquare;
b.FullMoveCount = this.FullMoveCount;
b.HalfMoveClock = this.HalfMoveClock;
b.IsWhiteMove = this.IsWhiteMove;
for (int i = 0; i < b._board.GetLength(0); i++)
{
for (int j = 0; j < b._board.GetLength(1); j++)
{
b._board[i, j] = this._board[i, j];
}
}
return(b);
}
static Move ValidatePieceMove(Move move, BoardSetup board,
PieceType piece, PieceType pieceType)
{
var rank = move.TargetSquare.Rank - 1;
var ifile = (int)move.TargetSquare.File - 1;
Color color = board.IsWhiteMove ? Color.White : Color.Black;
var targetPieceNotKing = board[move.TargetSquare]?.PieceType != PieceType.King &&
board[move.TargetSquare]?.Color != color;
Func <int, int, bool> pieceCondition;
if (pieceType == PieceType.Bishop)
{
pieceCondition = (f, r) => Math.Abs(ifile - f) == Math.Abs(rank - r);
}
else if (pieceType == PieceType.Rook)
{
pieceCondition = (f, r) => (ifile == f || rank == r);
}
else if (pieceType == PieceType.King)
{
pieceCondition = (f, r) => Math.Abs(ifile - f) <= 1 && Math.Abs(rank - r) <= 1;
}
else
{
throw new InvalidOperationException("Invalid piece was passed to func");
}
Square original = null;
for (int f = 0; f < 8; f++)
{
for (int r = 0; r < 8; r++)
{
if (board[f, r]?.PieceType == piece &&
board[f, r]?.Color == color &&
pieceCondition(f, r) &&
targetPieceNotKing &&
(move.OriginRank == null || move.OriginRank == (r + 1)) &&
(move.OriginFile == null || move.OriginFile == (File)(f + 1)))
{
int pathLenght = Math.Abs(ifile - f);
int df = Math.Sign(ifile - f);
int dr = Math.Sign(rank - r);
bool freePath = true;
for (int i = 1; i < pathLenght; i++)
{
if (board[f + df * i, r + dr * i] != null)
{
freePath = false;
break;
}
}
if (freePath == true)
{
if (original == null)
{
original = new Square((File)(f + 1), r + 1);
}
else
{
throw new InvalidOperationException("More than one piece can make a given move");
}
}
}
}
}
if (original != null)
{
var result = move.Clone();
result.OriginSquare = original;
result.OriginFile = original.File;
result.OriginRank = original.Rank;
return(result);
}
return(null);
}
