2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2010 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/>.
37 #include "ucioption.h"
44 // FEN string for the initial position
45 const string StartPositionFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
47 // UCIParser is a class for parsing UCI input. The class
48 // is actually a string stream built on a given input string.
49 typedef istringstream UCIParser;
52 void set_option(UCIParser& up);
53 void set_position(Position& pos, UCIParser& up);
54 bool go(Position& pos, UCIParser& up);
55 void perft(Position& pos, UCIParser& up);
59 /// execute_uci_command() takes a string as input, uses a UCIParser
60 /// object to parse this text string as a UCI command, and calls
61 /// the appropriate functions. In addition to the UCI commands,
62 /// the function also supports a few debug commands.
64 bool execute_uci_command(const string& cmd) {
66 static Position pos(StartPositionFEN, false, 0); // The root position
70 up >> token; // operator>>() skips any whitespace
75 else if (token == "go")
78 else if (token == "uci")
79 cout << "id name " << engine_name()
80 << "\nid author " << engine_author()
81 << "\n" << options_to_uci()
84 else if (token == "ucinewgame")
85 pos.from_fen(StartPositionFEN, false);
87 else if (token == "isready")
88 cout << "readyok" << endl;
90 else if (token == "position")
91 set_position(pos, up);
93 else if (token == "setoption")
96 else if (token == "d")
99 else if (token == "eval")
100 cout << trace_evaluate(pos) << endl;
102 else if (token == "key")
103 cout << "key: " << hex << pos.get_key()
104 << "\nmaterial key: " << pos.get_material_key()
105 << "\npawn key: " << pos.get_pawn_key() << endl;
107 else if (token == "perft")
110 else if (token == "flip")
112 Position p(pos, pos.thread());
116 cout << "Unknown command: " << cmd << endl;
128 // set_position() is called when Stockfish receives the "position" UCI
129 // command. The input parameter is a UCIParser. It is assumed
130 // that this parser has consumed the first token of the UCI command
131 // ("position"), and is ready to read the second token ("startpos"
132 // or "fen", if the input is well-formed).
134 void set_position(Position& pos, UCIParser& up) {
138 up >> token; // operator>>() skips any whitespace
140 if (token == "startpos")
142 pos.from_fen(StartPositionFEN, false);
143 up >> token; // Consume "moves" token
145 else if (token == "fen")
147 while (up >> token && token != "moves")
150 pos.from_fen(fen, Options["UCI_Chess960"].value<bool>());
154 // Parse move list (if any)
156 pos.do_setup_move(move_from_uci(pos, token));
160 // set_option() is called when Stockfish receives the "setoption" UCI
161 // command. The input parameter is a UCIParser. It is assumed
162 // that this parser has consumed the first token of the UCI command
163 // ("setoption"), and is ready to read the second token ("name", if
164 // the input is well-formed).
166 void set_option(UCIParser& up) {
168 string value = "true"; // UCI buttons don't have a "value" field
171 up >> token; // Consume "name" token
172 up >> name; // Read option name
174 // Handle names with included spaces
175 while (up >> token && token != "value")
178 up >> value; // Read option value
180 // Handle values with included spaces
182 value += " " + token;
184 if (Options.find(name) != Options.end())
185 Options[name].set_value(value);
187 cout << "No such option: " << name << endl;
191 // go() is called when Stockfish receives the "go" UCI command. The
192 // input parameter is a UCIParser. It is assumed that this
193 // parser has consumed the first token of the UCI command ("go"),
194 // and is ready to read the second token. The function sets the
195 // thinking time and other parameters from the input string, and
196 // calls think() (defined in search.cpp) with the appropriate
197 // parameters. Returns false if a quit command is received while
198 // thinking, returns true otherwise.
200 bool go(Position& pos, UCIParser& up) {
203 Move searchMoves[MOVES_MAX];
204 int movesToGo, depth, nodes, moveTime, numOfMoves;
205 bool infinite, ponder;
206 int time[2] = {0, 0}, inc[2] = {0, 0};
208 searchMoves[0] = MOVE_NONE;
209 infinite = ponder = false;
210 movesToGo = depth = nodes = moveTime = numOfMoves = 0;
214 if (token == "infinite")
216 else if (token == "ponder")
218 else if (token == "wtime")
220 else if (token == "btime")
222 else if (token == "winc")
224 else if (token == "binc")
226 else if (token == "movestogo")
228 else if (token == "depth")
230 else if (token == "nodes")
232 else if (token == "movetime")
234 else if (token == "searchmoves")
237 searchMoves[numOfMoves++] = move_from_uci(pos, token);
239 searchMoves[numOfMoves] = MOVE_NONE;
245 return think(pos, infinite, ponder, time, inc, movesToGo,
246 depth, nodes, moveTime, searchMoves);
249 void perft(Position& pos, UCIParser& up) {
257 tm = get_system_time();
259 n = perft(pos, depth * ONE_PLY);
261 tm = get_system_time() - tm;
262 std::cout << "\nNodes " << n
263 << "\nTime (ms) " << tm
264 << "\nNodes/second " << int(n / (tm / 1000.0)) << std::endl;