public static int Read(int[] table, int square, bool isWhite)
{
if (isWhite)
{
var file = BoardRepresentation.FileIndex(square);
var rank = BoardRepresentation.RankIndex(square);
rank = 15 - rank;
square = rank * 16 + file;
}
return(table[square]);
}
static string NotationFromMove(Board board, Move move)
{
MoveGenerator moveGen = new MoveGenerator();
int movePieceType = Piece.PieceType(board.Square[move.StartSquare]);
int capturedPieceType = Piece.PieceType(board.Square[move.TargetSquare]);
if (move.MoveFlag == Move.Flag.Castling)
{
int delta = move.TargetSquare - move.StartSquare;
if (delta == 2)
{
return("O-O");
}
else if (delta == -2)
{
return("O-O-O");
}
}
string moveNotation = GetSymbolFromPieceType(movePieceType);
// check if any ambiguity exists in notation (e.g if e2 can be reached via Nfe2 and Nbe2)
if (movePieceType != Piece.Pawn && movePieceType != Piece.King)
{
var allMoves = moveGen.GenerateMoves(board);
foreach (Move altMove in allMoves)
{
if (altMove.StartSquare != move.StartSquare && altMove.TargetSquare == move.TargetSquare) // if moving to same square from different square
{
if (Piece.PieceType(board.Square[altMove.StartSquare]) == movePieceType) // same piece type
{
int fromFileIndex = BoardRepresentation.FileIndex(move.StartSquare);
int alternateFromFileIndex = BoardRepresentation.FileIndex(altMove.StartSquare);
int fromRankIndex = BoardRepresentation.RankIndex(move.StartSquare);
int alternateFromRankIndex = BoardRepresentation.RankIndex(altMove.StartSquare);
if (fromFileIndex != alternateFromFileIndex) // pieces on different files, thus ambiguity can be resolved by specifying file
{
moveNotation += BoardRepresentation.fileNames[fromFileIndex];
break; // ambiguity resolved
}
else if (fromRankIndex != alternateFromRankIndex)
{
moveNotation += BoardRepresentation.rankNames[fromRankIndex];
break; // ambiguity resolved
}
}
}
}
}
if (capturedPieceType != 0) // add 'x' to indicate capture
{
if (movePieceType == Piece.Pawn)
{
moveNotation += BoardRepresentation.fileNames[BoardRepresentation.FileIndex(move.StartSquare)];
}
moveNotation += "x";
}
else // check if capturing ep
{
if (move.MoveFlag == Move.Flag.EnPassantCapture)
{
moveNotation += BoardRepresentation.fileNames[BoardRepresentation.FileIndex(move.StartSquare)] + "x";
}
}
moveNotation += BoardRepresentation.fileNames[BoardRepresentation.FileIndex(move.TargetSquare)];
moveNotation += BoardRepresentation.rankNames[BoardRepresentation.RankIndex(move.TargetSquare)];
// add promotion piece
if (move.IsPromotion)
{
int promotionPieceType = move.PromotionPieceType;
moveNotation += "=" + GetSymbolFromPieceType(promotionPieceType);
}
board.MakeMove(move, inSearch: true);
var legalResponses = moveGen.GenerateMoves(board);
// add check/mate symbol if applicable
if (moveGen.InCheck())
{
if (legalResponses.Count == 0)
{
moveNotation += "#";
}
else
{
moveNotation += "+";
}
}
board.UnmakeMove(move, inSearch: true);
return(moveNotation);
}