mirror of
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317 lines
10 KiB
C++
317 lines
10 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
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Copyright (C) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <cassert>
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#include <iostream>
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#include <sstream>
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#include <string>
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#include "evaluate.h"
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#include "movegen.h"
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#include "position.h"
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#include "search.h"
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#include "thread.h"
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#include "timeman.h"
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#include "tt.h"
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#include "uci.h"
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#include "syzygy/tbprobe.h"
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using namespace std;
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extern vector<string> setup_bench(const Position&, istream&);
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namespace {
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// FEN string of the initial position, normal chess
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const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
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// position() is called when engine receives the "position" UCI command.
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// The function sets up the position described in the given FEN string ("fen")
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// or the starting position ("startpos") and then makes the moves given in the
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// following move list ("moves").
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void position(Position& pos, istringstream& is, StateListPtr& states) {
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Move m;
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string token, fen;
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is >> token;
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if (token == "startpos")
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{
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fen = StartFEN;
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is >> token; // Consume "moves" token if any
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}
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else if (token == "fen")
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while (is >> token && token != "moves")
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fen += token + " ";
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else
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return;
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states = StateListPtr(new std::deque<StateInfo>(1)); // Drop old and create a new one
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pos.set(fen, Options["UCI_Chess960"], &states->back(), Threads.main());
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// Parse move list (if any)
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while (is >> token && (m = UCI::to_move(pos, token)) != MOVE_NONE)
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{
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states->emplace_back();
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pos.do_move(m, states->back());
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}
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}
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// setoption() is called when engine receives the "setoption" UCI command. The
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// function updates the UCI option ("name") to the given value ("value").
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void setoption(istringstream& is) {
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string token, name, value;
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is >> token; // Consume "name" token
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// Read option name (can contain spaces)
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while (is >> token && token != "value")
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name += (name.empty() ? "" : " ") + token;
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// Read option value (can contain spaces)
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while (is >> token)
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value += (value.empty() ? "" : " ") + token;
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if (Options.count(name))
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Options[name] = value;
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else
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sync_cout << "No such option: " << name << sync_endl;
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}
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// go() is called when engine receives the "go" UCI command. The function sets
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// the thinking time and other parameters from the input string, then starts
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// the search.
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void go(Position& pos, istringstream& is, StateListPtr& states) {
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Search::LimitsType limits;
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string token;
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bool ponderMode = false;
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limits.startTime = now(); // As early as possible!
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while (is >> token)
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if (token == "searchmoves")
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while (is >> token)
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limits.searchmoves.push_back(UCI::to_move(pos, token));
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else if (token == "wtime") is >> limits.time[WHITE];
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else if (token == "btime") is >> limits.time[BLACK];
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else if (token == "winc") is >> limits.inc[WHITE];
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else if (token == "binc") is >> limits.inc[BLACK];
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else if (token == "movestogo") is >> limits.movestogo;
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else if (token == "depth") is >> limits.depth;
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else if (token == "nodes") is >> limits.nodes;
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else if (token == "movetime") is >> limits.movetime;
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else if (token == "mate") is >> limits.mate;
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else if (token == "perft") is >> limits.perft;
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else if (token == "infinite") limits.infinite = 1;
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else if (token == "ponder") ponderMode = true;
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Threads.start_thinking(pos, states, limits, ponderMode);
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}
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// bench() is called when engine receives the "bench" command. Firstly
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// a list of UCI commands is setup according to bench parameters, then
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// it is run one by one printing a summary at the end.
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void bench(Position& pos, istream& args, StateListPtr& states) {
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string token;
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uint64_t num, nodes = 0, cnt = 1;
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vector<string> list = setup_bench(pos, args);
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num = count_if(list.begin(), list.end(), [](string s) { return s.find("go ") == 0; });
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TimePoint elapsed = now();
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for (const auto& cmd : list)
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{
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istringstream is(cmd);
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is >> skipws >> token;
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if (token == "go")
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{
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cerr << "\nPosition: " << cnt++ << '/' << num << endl;
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go(pos, is, states);
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Threads.main()->wait_for_search_finished();
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nodes += Threads.nodes_searched();
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}
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else if (token == "setoption") setoption(is);
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else if (token == "position") position(pos, is, states);
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else if (token == "ucinewgame") Search::clear();
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}
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elapsed = now() - elapsed + 1; // Ensure positivity to avoid a 'divide by zero'
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dbg_print(); // Just before exiting
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cerr << "\n==========================="
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<< "\nTotal time (ms) : " << elapsed
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<< "\nNodes searched : " << nodes
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<< "\nNodes/second : " << 1000 * nodes / elapsed << endl;
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}
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} // namespace
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/// UCI::loop() waits for a command from stdin, parses it and calls the appropriate
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/// function. Also intercepts EOF from stdin to ensure gracefully exiting if the
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/// GUI dies unexpectedly. When called with some command line arguments, e.g. to
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/// run 'bench', once the command is executed the function returns immediately.
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/// In addition to the UCI ones, also some additional debug commands are supported.
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void UCI::loop(int argc, char* argv[]) {
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Position pos;
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string token, cmd;
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StateListPtr states(new std::deque<StateInfo>(1));
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auto uiThread = std::make_shared<Thread>(0);
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pos.set(StartFEN, false, &states->back(), uiThread.get());
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for (int i = 1; i < argc; ++i)
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cmd += std::string(argv[i]) + " ";
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do {
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if (argc == 1 && !getline(cin, cmd)) // Block here waiting for input or EOF
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cmd = "quit";
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istringstream is(cmd);
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token.clear(); // Avoid a stale if getline() returns empty or blank line
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is >> skipws >> token;
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// The GUI sends 'ponderhit' to tell us the user has played the expected move.
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// So 'ponderhit' will be sent if we were told to ponder on the same move the
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// user has played. We should continue searching but switch from pondering to
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// normal search. In case Threads.stopOnPonderhit is set we are waiting for
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// 'ponderhit' to stop the search, for instance if max search depth is reached.
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if ( token == "quit"
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|| token == "stop"
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|| (token == "ponderhit" && Threads.stopOnPonderhit))
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Threads.stop = true;
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else if (token == "ponderhit")
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Threads.ponder = false; // Switch to normal search
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else if (token == "uci")
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sync_cout << "id name " << engine_info(true)
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<< "\n" << Options
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<< "\nuciok" << sync_endl;
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else if (token == "setoption") setoption(is);
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else if (token == "go") go(pos, is, states);
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else if (token == "position") position(pos, is, states);
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else if (token == "ucinewgame") Search::clear();
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else if (token == "isready") sync_cout << "readyok" << sync_endl;
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// Additional custom non-UCI commands, mainly for debugging
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else if (token == "flip") pos.flip();
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else if (token == "bench") bench(pos, is, states);
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else if (token == "d") sync_cout << pos << sync_endl;
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else if (token == "eval") sync_cout << Eval::trace(pos) << sync_endl;
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else
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sync_cout << "Unknown command: " << cmd << sync_endl;
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} while (token != "quit" && argc == 1); // Command line args are one-shot
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}
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/// UCI::value() converts a Value to a string suitable for use with the UCI
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/// protocol specification:
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///
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/// cp <x> The score from the engine's point of view in centipawns.
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/// mate <y> Mate in y moves, not plies. If the engine is getting mated
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/// use negative values for y.
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string UCI::value(Value v) {
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assert(-VALUE_INFINITE < v && v < VALUE_INFINITE);
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stringstream ss;
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if (abs(v) < VALUE_MATE - MAX_PLY)
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ss << "cp " << v * 100 / PawnValueEg;
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else
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ss << "mate " << (v > 0 ? VALUE_MATE - v + 1 : -VALUE_MATE - v) / 2;
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return ss.str();
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}
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/// UCI::square() converts a Square to a string in algebraic notation (g1, a7, etc.)
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std::string UCI::square(Square s) {
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return std::string{ char('a' + file_of(s)), char('1' + rank_of(s)) };
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}
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/// UCI::move() converts a Move to a string in coordinate notation (g1f3, a7a8q).
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/// The only special case is castling, where we print in the e1g1 notation in
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/// normal chess mode, and in e1h1 notation in chess960 mode. Internally all
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/// castling moves are always encoded as 'king captures rook'.
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string UCI::move(Move m, bool chess960) {
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Square from = from_sq(m);
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Square to = to_sq(m);
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if (m == MOVE_NONE)
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return "(none)";
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if (m == MOVE_NULL)
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return "0000";
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if (type_of(m) == CASTLING && !chess960)
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to = make_square(to > from ? FILE_G : FILE_C, rank_of(from));
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string move = UCI::square(from) + UCI::square(to);
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if (type_of(m) == PROMOTION)
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move += " pnbrqk"[promotion_type(m)];
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return move;
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}
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/// UCI::to_move() converts a string representing a move in coordinate notation
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/// (g1f3, a7a8q) to the corresponding legal Move, if any.
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Move UCI::to_move(const Position& pos, string& str) {
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if (str.length() == 5) // Junior could send promotion piece in uppercase
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str[4] = char(tolower(str[4]));
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for (const auto& m : MoveList<LEGAL>(pos))
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if (str == UCI::move(m, pos.is_chess960()))
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return m;
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return MOVE_NONE;
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}
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