static const string Defaults[] = {
"rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
- "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -",
- "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -",
+ "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 10",
+ "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 11",
"4rrk1/pp1n3p/3q2pQ/2p1pb2/2PP4/2P3N1/P2B2PP/4RRK1 b - - 7 19",
"rq3rk1/ppp2ppp/1bnpb3/3N2B1/3NP3/7P/PPPQ1PP1/2KR3R w - - 7 14",
"r1bq1r1k/1pp1n1pp/1p1p4/4p2Q/4Pp2/1BNP4/PPP2PPP/3R1RK1 w - - 2 14",
/// string. This function is not very robust - make sure that input FENs are
/// correct (this is assumed to be the responsibility of the GUI).
-void Position::from_fen(const string& fen, bool isChess960) {
+void Position::from_fen(const string& fenStr, bool isChess960) {
/*
A FEN string defines a particular position using only the ASCII character set.
char col, row, token;
size_t p;
Square sq = SQ_A8;
- std::istringstream ss(fen);
+ std::istringstream fen(fenStr);
clear();
- ss >> std::noskipws;
+ fen >> std::noskipws;
// 1. Piece placement
- while ((ss >> token) && !isspace(token))
+ while ((fen >> token) && !isspace(token))
{
if (token == '/')
sq -= Square(16); // Jump back of 2 rows
}
// 2. Active color
- ss >> token;
+ fen >> token;
sideToMove = (token == 'w' ? WHITE : BLACK);
- ss >> token;
+ fen >> token;
// 3. Castling availability
- while ((ss >> token) && !isspace(token))
+ while ((fen >> token) && !isspace(token))
set_castling_rights(token);
// 4. En passant square. Ignore if no pawn capture is possible
- if ( ((ss >> col) && (col >= 'a' && col <= 'h'))
- && ((ss >> row) && (row == '3' || row == '6')))
+ if ( ((fen >> col) && (col >= 'a' && col <= 'h'))
+ && ((fen >> row) && (row == '3' || row == '6')))
{
st->epSquare = make_square(File(col - 'a'), Rank(row - '1'));
Color them = opposite_color(sideToMove);
}
// 5-6. Halfmove clock and fullmove number
- ss >> std::skipws >> st->rule50 >> fullMoves;
+ fen >> std::skipws >> st->rule50 >> fullMoves;
// Various initialisations
chess960 = isChess960;
const string Position::to_fen() const {
- string fen;
+ std::ostringstream fen;
Square sq;
- char emptyCnt;
+ int emptyCnt;
- for (Rank rank = RANK_8; rank >= RANK_1; rank--, fen += '/')
+ for (Rank rank = RANK_8; rank >= RANK_1; rank--)
{
- emptyCnt = '0';
+ emptyCnt = 0;
for (File file = FILE_A; file <= FILE_H; file++)
{
if (!square_is_empty(sq))
{
- if (emptyCnt != '0')
+ if (emptyCnt)
{
- fen += emptyCnt;
- emptyCnt = '0';
+ fen << emptyCnt;
+ emptyCnt = 0;
}
- fen += PieceToChar[piece_on(sq)];
- } else
+ fen << PieceToChar[piece_on(sq)];
+ }
+ else
emptyCnt++;
}
- if (emptyCnt != '0')
- fen += emptyCnt;
+ if (emptyCnt)
+ fen << emptyCnt;
+
+ if (rank > RANK_1)
+ fen << '/';
}
- fen += (sideToMove == WHITE ? " w " : " b ");
+ fen << (sideToMove == WHITE ? " w " : " b ");
if (st->castleRights != CASTLES_NONE)
{
if (can_castle(WHITE_OO))
- fen += chess960 ? char(toupper(file_to_char(square_file(castle_rook_square(WHITE_OO))))) : 'K';
+ fen << (chess960 ? char(toupper(file_to_char(square_file(castle_rook_square(WHITE_OO))))) : 'K');
if (can_castle(WHITE_OOO))
- fen += chess960 ? char(toupper(file_to_char(square_file(castle_rook_square(WHITE_OOO))))) : 'Q';
+ fen << (chess960 ? char(toupper(file_to_char(square_file(castle_rook_square(WHITE_OOO))))) : 'Q');
if (can_castle(BLACK_OO))
- fen += chess960 ? file_to_char(square_file(castle_rook_square(BLACK_OO))) : 'k';
+ fen << (chess960 ? file_to_char(square_file(castle_rook_square(BLACK_OO))) : 'k');
if (can_castle(BLACK_OOO))
- fen += chess960 ? file_to_char(square_file(castle_rook_square(BLACK_OOO))) : 'q';
+ fen << (chess960 ? file_to_char(square_file(castle_rook_square(BLACK_OOO))) : 'q');
} else
- fen += '-';
+ fen << '-';
+
+ fen << (ep_square() == SQ_NONE ? " -" : " " + square_to_string(ep_square()))
+ << " " << st->rule50 << " " << fullMoves;
- fen += (ep_square() == SQ_NONE ? " -" : " " + square_to_string(ep_square()));
- return fen;
+ return fen.str();
}
if (move)
{
Position p(*this, thread());
- string dd = (piece_color(piece_on(move_from(move))) == BLACK ? ".." : "");
+ string dd = (sideToMove == BLACK ? ".." : "");
cout << "\nMove is: " << dd << move_to_san(p, move);
}