/*
- Glaurung, a UCI chess playing engine.
- Copyright (C) 2004-2008 Tord Romstad
+ Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+ Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+ Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
- Glaurung is free software: you can redistribute it and/or modify
+ Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
-
- Glaurung is distributed in the hope that it will be useful,
+
+ Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
-
+
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-
-////
-//// Includes
-////
-
#include <cassert>
+#include <cstring>
+#include <iomanip>
+#include <string>
+#include <sstream>
#include "move.h"
-#include "piece.h"
-#include "position.h"
-#include "ucioption.h"
-
-
-////
-//// Functions
-////
-
-/// move_from_string() takes a position and a string as input, and attempts to
-/// convert the string to a move, using simple coordinate notation (g1f3,
-/// a7a8q, etc.). In order to correctly parse en passant captures and castling
-/// moves, we need the position. This function is not robust, and expects that
-/// the input move is legal and correctly formatted.
-
-Move move_from_string(const Position &pos, const std::string &str) {
- Square from, to;
- Piece piece;
- Color us = pos.side_to_move();
-
- if(str.length() < 4) return MOVE_NONE;
-
- // Read the from and to squares:
- from = square_from_string(str.substr(0, 2));
- to = square_from_string(str.substr(2, 4));
-
- // Find the moving piece:
- piece = pos.piece_on(from);
-
- // If the string has more than 4 characters, try to interpret the 5th
- // character as a promotion:
- if(type_of_piece(piece) == PAWN && str.length() >= 5) {
- switch(str[4]) {
- case 'n': case 'N':
- return make_promotion_move(from, to, KNIGHT);
- case 'b': case 'B':
- return make_promotion_move(from, to, BISHOP);
- case 'r': case 'R':
- return make_promotion_move(from, to, ROOK);
- case 'q': case 'Q':
- return make_promotion_move(from, to, QUEEN);
- }
- }
+#include "movegen.h"
+#include "search.h"
- if(piece == king_of_color(us)) {
- // Is this a castling move? A king move is assumed to be a castling
- // move if the destination square is occupied by a friendly rook, or
- // if the distance between the source and destination squares is more
- // than 1.
- if(pos.piece_on(to) == rook_of_color(us))
- return make_castle_move(from, to);
- else if(square_distance(from, to) > 1) {
- // This is a castling move, but we have to translate it to the
- // internal "king captures rook" representation.
- SquareDelta delta = (to > from)? DELTA_E : DELTA_W;
- Square s;
- for(s = from + delta;
- pawn_rank(us, s) == RANK_1 && pos.piece_on(s) != rook_of_color(us);
- s += delta);
- if(pawn_rank(us, s) == RANK_1 && pos.piece_on(s) == rook_of_color(us))
- return make_castle_move(from, s);
- }
- }
- else if(piece == pawn_of_color(us)) {
- // En passant move? We assume that a pawn move is an en passant move
- // without further testing if the destination square is epSquare.
- if(to == pos.ep_square())
- return make_ep_move(from, to);
- }
+using std::string;
- return make_move(from, to);
+namespace {
+ const string time_string(int milliseconds);
+ const string score_string(Value v);
}
-/// move_to_string() converts a move to a string in coordinate notation
-/// (g1f3, a7a8q, etc.). The only special case is castling moves, where we
+/// move_to_uci() converts a move to a string in coordinate notation
+/// (g1f3, a7a8q, etc.). The only special case is castling moves, where we
/// print in the e1g1 notation in normal chess mode, and in e1h1 notation in
/// Chess960 mode.
-const std::string move_to_string(Move move) {
- std::string str;
-
- if(move == MOVE_NONE)
- str = "(none)";
- else if(move == MOVE_NULL)
- str = "0000";
- else {
- if(!Chess960) {
- if(move_from(move) == SQ_E1 && move_is_short_castle(move)) {
- str = "e1g1"; return str;
- }
- else if(move_from(move) == SQ_E1 && move_is_long_castle(move)) {
- str = "e1c1"; return str;
+const string move_to_uci(Move m, bool chess960) {
+
+ Square from = move_from(m);
+ Square to = move_to(m);
+ string promotion;
+
+ if (m == MOVE_NONE)
+ return "(none)";
+
+ if (m == MOVE_NULL)
+ return "0000";
+
+ if (move_is_short_castle(m) && !chess960)
+ return from == SQ_E1 ? "e1g1" : "e8g8";
+
+ if (move_is_long_castle(m) && !chess960)
+ return from == SQ_E1 ? "e1c1" : "e8c8";
+
+ if (move_is_promotion(m))
+ promotion = char(tolower(piece_type_to_char(move_promotion_piece(m))));
+
+ return square_to_string(from) + square_to_string(to) + promotion;
+}
+
+
+/// move_from_uci() takes a position and a string representing a move in
+/// simple coordinate notation and returns an equivalent Move.
+
+Move move_from_uci(const Position& pos, const string& str) {
+
+ MoveStack mlist[MAX_MOVES];
+ MoveStack* last = generate<MV_LEGAL>(pos, mlist);
+
+ for (MoveStack* cur = mlist; cur != last; cur++)
+ if (str == move_to_uci(cur->move, pos.is_chess960()))
+ return cur->move;
+
+ return MOVE_NONE;
+}
+
+
+/// move_to_san() takes a position and a move as input, where it is assumed
+/// that the move is a legal move from the position. The return value is
+/// a string containing the move in short algebraic notation.
+
+const string move_to_san(Position& pos, Move m) {
+
+ assert(pos.is_ok());
+ assert(move_is_ok(m));
+
+ MoveStack mlist[MAX_MOVES];
+ Square from = move_from(m);
+ Square to = move_to(m);
+ PieceType pt = pos.type_of_piece_on(from);
+ string san;
+
+ if (m == MOVE_NONE)
+ return "(none)";
+
+ if (m == MOVE_NULL)
+ return "(null)";
+
+ if (move_is_long_castle(m))
+ san = "O-O-O";
+ else if (move_is_short_castle(m))
+ san = "O-O";
+ else
+ {
+ if (pt != PAWN)
+ {
+ san = piece_type_to_char(pt);
+
+ // Collect all legal moves of piece type 'pt' with destination 'to'
+ MoveStack* last = generate<MV_LEGAL>(pos, mlist);
+ int f = 0, r = 0;
+
+ for (MoveStack* cur = mlist; cur != last; cur++)
+ if ( move_to(cur->move) == to
+ && pos.type_of_piece_on(move_from(cur->move)) == pt)
+ {
+ if (square_file(move_from(cur->move)) == square_file(from))
+ f++;
+
+ if (square_rank(move_from(cur->move)) == square_rank(from))
+ r++;
+ }
+
+ assert(f > 0 && r > 0);
+
+ // Disambiguation if we have more then one piece with destination 'to'
+ if (f == 1 && r > 1)
+ san += file_to_char(square_file(from));
+ else if (f > 1 && r == 1)
+ san += rank_to_char(square_rank(from));
+ else if (f > 1 && r > 1)
+ san += square_to_string(from);
}
- if(move_from(move) == SQ_E8 && move_is_short_castle(move)) {
- str = "e8g8"; return str;
+
+ if (pos.move_is_capture(m))
+ {
+ if (pt == PAWN)
+ san += file_to_char(square_file(from));
+
+ san += 'x';
}
- else if(move_from(move) == SQ_E8 && move_is_long_castle(move)) {
- str = "e8c8"; return str;
+
+ san += square_to_string(to);
+
+ if (move_is_promotion(m))
+ {
+ san += '=';
+ san += piece_type_to_char(move_promotion_piece(m));
}
- }
- str = square_to_string(move_from(move)) + square_to_string(move_to(move));
- if(move_promotion(move))
- str += piece_type_to_char(move_promotion(move), false);
}
- return str;
+
+ // The move gives check? We don't use pos.move_is_check() here
+ // because we need to test for a mate after the move is done.
+ StateInfo st;
+ pos.do_move(m, st);
+ if (pos.is_check())
+ san += pos.is_mate() ? "#" : "+";
+ pos.undo_move(m);
+
+ return san;
}
-/// Overload the << operator, to make it easier to print moves.
+/// pretty_pv() creates a human-readable string from a position and a PV.
+/// It is used to write search information to the log file (which is created
+/// when the UCI parameter "Use Search Log" is "true").
+
+const string pretty_pv(Position& pos, int depth, Value score, int time, Move pv[]) {
+
+ const int64_t K = 1000;
+ const int64_t M = 1000000;
+ const int startColumn = 28;
+ const size_t maxLength = 80 - startColumn;
+ const string lf = string("\n") + string(startColumn, ' ');
+
+ StateInfo state[PLY_MAX_PLUS_2], *st = state;
+ Move* m = pv;
+ string san;
+ std::stringstream s;
+ size_t length = 0;
+
+ // First print depth, score, time and searched nodes...
+ s << std::setw(2) << depth
+ << std::setw(8) << score_string(score)
+ << std::setw(8) << time_string(time);
+
+ if (pos.nodes_searched() < M)
+ s << std::setw(8) << pos.nodes_searched() / 1 << " ";
+ else if (pos.nodes_searched() < K * M)
+ s << std::setw(7) << pos.nodes_searched() / K << "K ";
+ else
+ s << std::setw(7) << pos.nodes_searched() / M << "M ";
+
+ // ...then print the full PV line in short algebraic notation
+ while (*m != MOVE_NONE)
+ {
+ san = move_to_san(pos, *m);
+ length += san.length() + 1;
+
+ if (length > maxLength)
+ {
+ length = san.length() + 1;
+ s << lf;
+ }
+ s << san << ' ';
+
+ pos.do_move(*m++, *st++);
+ }
+
+ // Restore original position before to leave
+ while (m != pv) pos.undo_move(*--m);
-std::ostream &operator << (std::ostream &os, Move m) {
- return os << move_to_string(m);
+ return s.str();
}
-/// move_is_ok(), for debugging.
+namespace {
+
+ const string time_string(int millisecs) {
+
+ const int MSecMinute = 1000 * 60;
+ const int MSecHour = 1000 * 60 * 60;
+
+ int hours = millisecs / MSecHour;
+ int minutes = (millisecs % MSecHour) / MSecMinute;
+ int seconds = ((millisecs % MSecHour) % MSecMinute) / 1000;
+
+ std::stringstream s;
-bool move_is_ok(Move m) {
- return square_is_ok(move_from(m)) && square_is_ok(move_to(m));
+ if (hours)
+ s << hours << ':';
+
+ s << std::setfill('0') << std::setw(2) << minutes << ':' << std::setw(2) << seconds;
+ return s.str();
+ }
+
+
+ const string score_string(Value v) {
+
+ std::stringstream s;
+
+ if (v >= VALUE_MATE - 200)
+ s << "#" << (VALUE_MATE - v + 1) / 2;
+ else if (v <= -VALUE_MATE + 200)
+ s << "-#" << (VALUE_MATE + v) / 2;
+ else
+ s << std::setprecision(2) << std::fixed << std::showpos << float(v) / PawnValueMidgame;
+
+ return s.str();
+ }
}
projects / stockfish / blobdiff