2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
30 #include "ucioption.h"
34 extern void benchmark(const Position& pos, istream& is);
38 // FEN string of the initial position, normal chess
39 const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
41 // Keep track of position keys along the setup moves (from start position to the
42 // position just before to start searching). Needed by repetition draw detection.
43 Search::StateStackPtr SetupStates;
45 void set_option(istringstream& up);
46 void set_position(Position& pos, istringstream& up);
47 void go(Position& pos, istringstream& up);
51 /// Wait for a command from the user, parse this text string as an UCI command,
52 /// and call the appropriate functions. Also intercepts EOF from stdin to ensure
53 /// that we exit gracefully if the GUI dies unexpectedly. In addition to the UCI
54 /// commands, the function also supports a few debug commands.
56 void UCI::loop(const string& args) {
58 Position pos(StartFEN, false, Threads.main_thread()); // The root position
61 while (token != "quit")
66 else if (!getline(cin, cmd)) // Block here waiting for input
69 istringstream is(cmd);
71 is >> skipws >> token;
73 if (token == "quit" || token == "stop")
75 Search::Signals.stop = true;
76 Threads.wait_for_search_finished(); // Cannot quit while threads are running
79 else if (token == "ponderhit")
81 // The opponent has played the expected move. GUI sends "ponderhit" if
82 // we were told to ponder on the same move the opponent has played. We
83 // should continue searching but switching from pondering to normal search.
84 Search::Limits.ponder = false;
86 if (Search::Signals.stopOnPonderhit)
88 Search::Signals.stop = true;
89 Threads.main_thread()->wake_up(); // Could be sleeping
93 else if (token == "perft" && (is >> token)) // Read requested depth
97 ss << Options["Hash"] << " "
98 << Options["Threads"] << " " << token << " current perft";
103 else if (token == "key") sync_cout << "position key: " << hex << pos.key()
104 << "\nmaterial key: " << pos.material_key()
105 << "\npawn key: " << pos.pawn_key()
108 else if (token == "uci") sync_cout << "id name " << engine_info(true)
110 << "\nuciok" << sync_endl;
112 else if (token == "ucinewgame") TT.clear();
113 else if (token == "go") go(pos, is);
114 else if (token == "position") set_position(pos, is);
115 else if (token == "setoption") set_option(is);
116 else if (token == "d") pos.print();
117 else if (token == "flip") pos.flip();
118 else if (token == "bench") benchmark(pos, is);
119 else if (token == "isready") sync_cout << "readyok" << sync_endl;
120 else if (token == "eval") sync_cout << Eval::trace(pos) << sync_endl;
122 sync_cout << "Unknown command: " << cmd << sync_endl;
124 if (!args.empty()) // Command line arguments have one-shot behaviour
126 Threads.wait_for_search_finished();
135 // set_position() is called when engine receives the "position" UCI command.
136 // The function sets up the position described in the given fen string ("fen")
137 // or the starting position ("startpos") and then makes the moves given in the
138 // following move list ("moves").
140 void set_position(Position& pos, istringstream& is) {
147 if (token == "startpos")
150 is >> token; // Consume "moves" token if any
152 else if (token == "fen")
153 while (is >> token && token != "moves")
158 pos.from_fen(fen, Options["UCI_Chess960"], Threads.main_thread());
159 SetupStates = Search::StateStackPtr(new std::stack<StateInfo>());
161 // Parse move list (if any)
162 while (is >> token && (m = move_from_uci(pos, token)) != MOVE_NONE)
164 SetupStates->push(StateInfo());
165 pos.do_move(m, SetupStates->top());
170 // set_option() is called when engine receives the "setoption" UCI command. The
171 // function updates the UCI option ("name") to the given value ("value").
173 void set_option(istringstream& is) {
175 string token, name, value;
177 is >> token; // Consume "name" token
179 // Read option name (can contain spaces)
180 while (is >> token && token != "value")
181 name += string(" ", !name.empty()) + token;
183 // Read option value (can contain spaces)
185 value += string(" ", !value.empty()) + token;
187 if (Options.count(name))
188 Options[name] = value;
190 sync_cout << "No such option: " << name << sync_endl;
194 // go() is called when engine receives the "go" UCI command. The function sets
195 // the thinking time and other parameters from the input string, and then starts
198 void go(Position& pos, istringstream& is) {
200 Search::LimitsType limits;
201 vector<Move> searchMoves;
206 if (token == "searchmoves")
208 searchMoves.push_back(move_from_uci(pos, token));
210 else if (token == "wtime") is >> limits.time[WHITE];
211 else if (token == "btime") is >> limits.time[BLACK];
212 else if (token == "winc") is >> limits.inc[WHITE];
213 else if (token == "binc") is >> limits.inc[BLACK];
214 else if (token == "movestogo") is >> limits.movestogo;
215 else if (token == "depth") is >> limits.depth;
216 else if (token == "nodes") is >> limits.nodes;
217 else if (token == "movetime") is >> limits.movetime;
218 else if (token == "infinite") limits.infinite = true;
219 else if (token == "ponder") limits.ponder = true;
222 Threads.start_searching(pos, limits, searchMoves, SetupStates);