QString CaparandomBoard::defaultFenString() const
{
const int empty = Piece::NoPiece;
QVector<int> pieces(10);
// Generate positions until we get one where all the pawns are
// protected. This usually takes a handful of tries.
do
{
pieces.fill(empty);
if ((qrand() % 2) == 0)
{
addPiece(pieces, Queen, qrand() % 5, 0, 2);
addPiece(pieces, Archbishop, qrand() % 5, 1, 2);
}
else
{
addPiece(pieces, Archbishop, qrand() % 5, 0, 2);
addPiece(pieces, Queen, qrand() % 5, 1, 2);
}
addPiece(pieces, Bishop, qrand() % 4, 0, 2);
addPiece(pieces, Bishop, qrand() % 4, 1, 2);
addPiece(pieces, Chancellor, qrand() % 6);
addPiece(pieces, Knight, qrand() % 5);
addPiece(pieces, Knight, qrand() % 4);
addPiece(pieces, Rook, 0);
addPiece(pieces, King, 0);
addPiece(pieces, Rook, 0);
}
while (!pawnsAreSafe(pieces));
QString fen;
// Black pieces
foreach (int pieceType, pieces)
fen += pieceSymbol(Piece(Side::Black, pieceType));
fen += '/';
// Black pawns
for (int i = 0; i < width(); i++)
fen += pieceSymbol(Piece(Side::Black, Pawn));
fen += '/';
// Empty squares
for (int i = 0; i < height() - 4; i++)
fen += QString::number(pieces.size()) + '/';
// White pawns
for (int i = 0; i < width(); i++)
fen += pieceSymbol(Piece(Side::White, Pawn));
fen += '/';
// White pieces
foreach (int pieceType, pieces)
fen += pieceSymbol(Piece(Side::White, pieceType));
// Side to move, castling rights, enpassant square, etc.
fen += " w KQkq - 0 1";
return fen;
}
Move JanusBoard::moveFromSanString(const QString& str)
{
/*
* accepts O-O and Kb1/Kb8/Ki1/Ki8 formats for castling
* Xboard uses O-O for B-file and Ki1/Ki8 for I-file castling
*/
if (str.startsWith("O-O-O"))
return WesternBoard::moveFromSanString("O-O");
if (str.startsWith("O-O"))
return WesternBoard::moveFromSanString("O-O-O");
if (!str.startsWith(pieceSymbol(King).toUpper()))
return WesternBoard::moveFromSanString(str); //main path
if (hasCastlingRight(sideToMove(), KingSide))
{
Move castlingMove = WesternBoard::moveFromSanString("O-O");
if (!castlingMove.isNull() && str == sanMoveString(castlingMove))
return castlingMove;
}
if (hasCastlingRight(sideToMove(), QueenSide))
{
Move castlingMove = WesternBoard::moveFromSanString("O-O-O");
if (!castlingMove.isNull() && str == sanMoveString(castlingMove))
return castlingMove;
}
return WesternBoard::moveFromSanString(str); // normal king moves
}
QString JanusBoard::sanMoveString(const Move& move)
{
QString san = WesternBoard::sanMoveString(move);
if (!san.startsWith("O-O"))
return san;
// uses Kb1/Kb8/Ki1/Ki8 for castling
QString sym = san.right(1);
if (sym != "+" && sym != "#")
sym.clear();
return pieceSymbol(King).toUpper() + lanMoveString(move).mid(2) + sym;
}
