X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fuci.cpp;h=bb17b8d79b21ab8cd3e13855bcd404f7b074d545;hb=a0e2debe3f1d14f84984a9a2c1482dc41f695548;hp=1b7705065cd5de4dc6fefca0b2a1f9912cb07dd9;hpb=cc2b3ece5c5d8d1183f8526fbb0ee4e1ea7a69fe;p=stockfish
diff --git a/src/uci.cpp b/src/uci.cpp
index 1b770506..bb17b8d7 100644
--- a/src/uci.cpp
+++ b/src/uci.cpp
@@ -1,7 +1,6 @@
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -17,121 +16,40 @@
along with this program. If not, see .
*/
+#include
+#include
#include
#include
#include
#include "evaluate.h"
-#include "misc.h"
+#include "movegen.h"
#include "position.h"
#include "search.h"
#include "thread.h"
-#include "ucioption.h"
+#include "timeman.h"
+#include "tt.h"
+#include "uci.h"
+#include "syzygy/tbprobe.h"
using namespace std;
+namespace Stockfish {
+
+extern vector setup_bench(const Position&, istream&);
+
namespace {
// FEN string of the initial position, normal chess
const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
- // Keep track of position keys along the setup moves (from start position to the
- // position just before to start searching). This is needed by draw detection
- // where, due to 50 moves rule, we need to check at most 100 plies back.
- StateInfo StateRingBuf[102], *SetupState = StateRingBuf;
-
- void set_option(istringstream& up);
- void set_position(Position& pos, istringstream& up);
- void go(Position& pos, istringstream& up);
- void perft(Position& pos, istringstream& up);
-}
-
-
-/// Wait for a command from the user, parse this text string as an UCI command,
-/// and call the appropriate functions. Also intercepts EOF from stdin to ensure
-/// that we exit gracefully if the GUI dies unexpectedly. In addition to the UCI
-/// commands, the function also supports a few debug commands.
-void uci_loop() {
+ // position() is called when engine receives the "position" UCI command.
+ // The function sets up the position described in the given FEN string ("fen")
+ // or the starting position ("startpos") and then makes the moves given in the
+ // following move list ("moves").
- Position pos(StartFEN, false, 0); // The root position
- string cmd, token;
-
- while (token != "quit")
- {
- if (!getline(cin, cmd)) // Block here waiting for input
- cmd = "quit";
-
- istringstream is(cmd);
-
- is >> skipws >> token;
-
- if (token == "quit" || token == "stop")
- {
- Search::Signals.stop = true;
-
- if (token == "quit") // Cannot quit while threads are still running
- Threads.wait_for_search_finished();
- }
-
- else if (token == "ponderhit")
- {
- // The opponent has played the expected move. GUI sends "ponderhit" if
- // we were told to ponder on the same move the opponent has played. We
- // should continue searching but switching from pondering to normal search.
- Search::Limits.ponder = false;
-
- if (Search::Signals.stopOnPonderhit)
- Search::Signals.stop = true;
- }
-
- else if (token == "go")
- go(pos, is);
-
- else if (token == "isready")
- cout << "readyok" << endl;
-
- else if (token == "position")
- set_position(pos, is);
-
- else if (token == "setoption")
- set_option(is);
-
- else if (token == "perft")
- perft(pos, is);
-
- else if (token == "d")
- pos.print();
-
- else if (token == "flip")
- pos.flip_me();
-
- else if (token == "eval")
- cout << Eval::trace(pos) << endl;
-
- else if (token == "key")
- cout << "key: " << hex << pos.key()
- << "\nmaterial key: " << pos.material_key()
- << "\npawn key: " << pos.pawn_key() << endl;
-
- else if (token == "uci")
- cout << "id name " << engine_info(true)
- << "\n" << Options
- << "\nuciok" << endl;
- else
- cout << "Unknown command: " << cmd << endl;
- }
-}
-
-
-namespace {
-
- // set_position() is called when engine receives the "position" UCI
- // command. The function sets up the position described in the given
- // fen string ("fen") or the starting position ("startpos") and then
- // makes the moves given in the following move list ("moves").
-
- void set_position(Position& pos, istringstream& is) {
+ void position(Position& pos, istringstream& is, StateListPtr& states) {
Move m;
string token, fen;
@@ -149,24 +67,36 @@ namespace {
else
return;
- pos.from_fen(fen, Options["UCI_Chess960"]);
+ states = StateListPtr(new std::deque(1)); // Drop old and create a new one
+ pos.set(fen, Options["UCI_Chess960"], &states->back(), Threads.main());
// Parse move list (if any)
- while (is >> token && (m = move_from_uci(pos, token)) != MOVE_NONE)
+ while (is >> token && (m = UCI::to_move(pos, token)) != MOVE_NONE)
{
- pos.do_move(m, *SetupState);
-
- // Increment pointer to StateRingBuf circular buffer
- if (++SetupState - StateRingBuf >= 102)
- SetupState = StateRingBuf;
+ states->emplace_back();
+ pos.do_move(m, states->back());
}
}
+ // trace_eval() prints the evaluation for the current position, consistent with the UCI
+ // options set so far.
+
+ void trace_eval(Position& pos) {
+
+ StateListPtr states(new std::deque(1));
+ Position p;
+ p.set(pos.fen(), Options["UCI_Chess960"], &states->back(), Threads.main());
+
+ Eval::NNUE::verify();
+
+ sync_cout << "\n" << Eval::trace(p) << sync_endl;
+ }
+
- // set_option() is called when engine receives the "setoption" UCI command. The
+ // setoption() is called when engine receives the "setoption" UCI command. The
// function updates the UCI option ("name") to the given value ("value").
- void set_option(istringstream& is) {
+ void setoption(istringstream& is) {
string token, name, value;
@@ -174,79 +104,280 @@ namespace {
// Read option name (can contain spaces)
while (is >> token && token != "value")
- name += string(" ", !name.empty()) + token;
+ name += (name.empty() ? "" : " ") + token;
// Read option value (can contain spaces)
while (is >> token)
- value += string(" ", !value.empty()) + token;
+ value += (value.empty() ? "" : " ") + token;
if (Options.count(name))
Options[name] = value;
else
- cout << "No such option: " << name << endl;
+ sync_cout << "No such option: " << name << sync_endl;
}
// go() is called when engine receives the "go" UCI command. The function sets
- // the thinking time and other parameters from the input string, and then starts
+ // the thinking time and other parameters from the input string, then starts
// the search.
- void go(Position& pos, istringstream& is) {
+ void go(Position& pos, istringstream& is, StateListPtr& states) {
Search::LimitsType limits;
- std::set searchMoves;
string token;
+ bool ponderMode = false;
+
+ limits.startTime = now(); // As early as possible!
while (is >> token)
- {
- if (token == "wtime")
- is >> limits.times[WHITE];
- else if (token == "btime")
- is >> limits.times[BLACK];
- else if (token == "winc")
- is >> limits.incs[WHITE];
- else if (token == "binc")
- is >> limits.incs[BLACK];
- else if (token == "movestogo")
- is >> limits.movestogo;
- else if (token == "depth")
- is >> limits.depth;
- else if (token == "nodes")
- is >> limits.nodes;
- else if (token == "movetime")
- is >> limits.movetime;
- else if (token == "infinite")
- limits.infinite = true;
- else if (token == "ponder")
- limits.ponder = true;
- else if (token == "searchmoves")
+ if (token == "searchmoves") // Needs to be the last command on the line
while (is >> token)
- searchMoves.insert(move_from_uci(pos, token));
+ limits.searchmoves.push_back(UCI::to_move(pos, token));
+
+ else if (token == "wtime") is >> limits.time[WHITE];
+ else if (token == "btime") is >> limits.time[BLACK];
+ else if (token == "winc") is >> limits.inc[WHITE];
+ else if (token == "binc") is >> limits.inc[BLACK];
+ else if (token == "movestogo") is >> limits.movestogo;
+ else if (token == "depth") is >> limits.depth;
+ else if (token == "nodes") is >> limits.nodes;
+ else if (token == "movetime") is >> limits.movetime;
+ else if (token == "mate") is >> limits.mate;
+ else if (token == "perft") is >> limits.perft;
+ else if (token == "infinite") limits.infinite = 1;
+ else if (token == "ponder") ponderMode = true;
+
+ Threads.start_thinking(pos, states, limits, ponderMode);
+ }
+
+
+ // bench() is called when engine receives the "bench" command. Firstly
+ // a list of UCI commands is setup according to bench parameters, then
+ // it is run one by one printing a summary at the end.
+
+ void bench(Position& pos, istream& args, StateListPtr& states) {
+
+ string token;
+ uint64_t num, nodes = 0, cnt = 1;
+
+ vector list = setup_bench(pos, args);
+ num = count_if(list.begin(), list.end(), [](string s) { return s.find("go ") == 0 || s.find("eval") == 0; });
+
+ TimePoint elapsed = now();
+
+ for (const auto& cmd : list)
+ {
+ istringstream is(cmd);
+ is >> skipws >> token;
+
+ if (token == "go" || token == "eval")
+ {
+ cerr << "\nPosition: " << cnt++ << '/' << num << " (" << pos.fen() << ")" << endl;
+ if (token == "go")
+ {
+ go(pos, is, states);
+ Threads.main()->wait_for_search_finished();
+ nodes += Threads.nodes_searched();
+ }
+ else
+ trace_eval(pos);
+ }
+ else if (token == "setoption") setoption(is);
+ else if (token == "position") position(pos, is, states);
+ else if (token == "ucinewgame") { Search::clear(); elapsed = now(); } // Search::clear() may take some while
}
- Threads.start_searching(pos, limits, searchMoves);
+ elapsed = now() - elapsed + 1; // Ensure positivity to avoid a 'divide by zero'
+
+ dbg_print(); // Just before exiting
+
+ cerr << "\n==========================="
+ << "\nTotal time (ms) : " << elapsed
+ << "\nNodes searched : " << nodes
+ << "\nNodes/second : " << 1000 * nodes / elapsed << endl;
}
+ // The win rate model returns the probability (per mille) of winning given an eval
+ // and a game-ply. The model fits rather accurately the LTC fishtest statistics.
+ int win_rate_model(Value v, int ply) {
- // perft() is called when engine receives the "perft" command. The function
- // calls perft() with the required search depth then prints counted leaf nodes
- // and elapsed time.
+ // The model captures only up to 240 plies, so limit input (and rescale)
+ double m = std::min(240, ply) / 64.0;
- void perft(Position& pos, istringstream& is) {
+ // Coefficients of a 3rd order polynomial fit based on fishtest data
+ // for two parameters needed to transform eval to the argument of a
+ // logistic function.
+ double as[] = {-8.24404295, 64.23892342, -95.73056462, 153.86478679};
+ double bs[] = {-3.37154371, 28.44489198, -56.67657741, 72.05858751};
+ double a = (((as[0] * m + as[1]) * m + as[2]) * m) + as[3];
+ double b = (((bs[0] * m + bs[1]) * m + bs[2]) * m) + bs[3];
- int depth;
+ // Transform eval to centipawns with limited range
+ double x = std::clamp(double(100 * v) / PawnValueEg, -1000.0, 1000.0);
- if (!(is >> depth))
- return;
+ // Return win rate in per mille (rounded to nearest)
+ return int(0.5 + 1000 / (1 + std::exp((a - x) / b)));
+ }
- Time time = Time::current_time();
+} // namespace
- int64_t n = Search::perft(pos, depth * ONE_PLY);
- int e = time.elapsed();
+/// UCI::loop() waits for a command from stdin, parses it and calls the appropriate
+/// function. Also intercepts EOF from stdin to ensure gracefully exiting if the
+/// GUI dies unexpectedly. When called with some command line arguments, e.g. to
+/// run 'bench', once the command is executed the function returns immediately.
+/// In addition to the UCI ones, also some additional debug commands are supported.
- std::cout << "\nNodes " << n
- << "\nTime (ms) " << e
- << "\nNodes/second " << int(n / (e / 1000.0)) << std::endl;
- }
+void UCI::loop(int argc, char* argv[]) {
+
+ Position pos;
+ string token, cmd;
+ StateListPtr states(new std::deque(1));
+
+ pos.set(StartFEN, false, &states->back(), Threads.main());
+
+ for (int i = 1; i < argc; ++i)
+ cmd += std::string(argv[i]) + " ";
+
+ do {
+ if (argc == 1 && !getline(cin, cmd)) // Block here waiting for input or EOF
+ cmd = "quit";
+
+ istringstream is(cmd);
+
+ token.clear(); // Avoid a stale if getline() returns empty or blank line
+ is >> skipws >> token;
+
+ if ( token == "quit"
+ || token == "stop")
+ Threads.stop = true;
+
+ // The GUI sends 'ponderhit' to tell us the user has played the expected move.
+ // So 'ponderhit' will be sent if we were told to ponder on the same move the
+ // user has played. We should continue searching but switch from pondering to
+ // normal search.
+ else if (token == "ponderhit")
+ Threads.main()->ponder = false; // Switch to normal search
+
+ else if (token == "uci")
+ sync_cout << "id name " << engine_info(true)
+ << "\n" << Options
+ << "\nuciok" << sync_endl;
+
+ else if (token == "setoption") setoption(is);
+ else if (token == "go") go(pos, is, states);
+ else if (token == "position") position(pos, is, states);
+ else if (token == "ucinewgame") Search::clear();
+ else if (token == "isready") sync_cout << "readyok" << sync_endl;
+
+ // Additional custom non-UCI commands, mainly for debugging.
+ // Do not use these commands during a search!
+ else if (token == "flip") pos.flip();
+ else if (token == "bench") bench(pos, is, states);
+ else if (token == "d") sync_cout << pos << sync_endl;
+ else if (token == "eval") trace_eval(pos);
+ else if (token == "compiler") sync_cout << compiler_info() << sync_endl;
+ else if (token == "export_net") {
+ std::optional filename;
+ std::string f;
+ if (is >> skipws >> f) {
+ filename = f;
+ }
+ Eval::NNUE::export_net(filename);
+ }
+ else if (!token.empty() && token[0] != '#')
+ sync_cout << "Unknown command: " << cmd << sync_endl;
+
+ } while (token != "quit" && argc == 1); // Command line args are one-shot
+}
+
+
+/// UCI::value() converts a Value to a string suitable for use with the UCI
+/// protocol specification:
+///
+/// cp The score from the engine's point of view in centipawns.
+/// mate Mate in y moves, not plies. If the engine is getting mated
+/// use negative values for y.
+
+string UCI::value(Value v) {
+
+ assert(-VALUE_INFINITE < v && v < VALUE_INFINITE);
+
+ stringstream ss;
+
+ if (abs(v) < VALUE_MATE_IN_MAX_PLY)
+ ss << "cp " << v * 100 / PawnValueEg;
+ else
+ ss << "mate " << (v > 0 ? VALUE_MATE - v + 1 : -VALUE_MATE - v) / 2;
+
+ return ss.str();
}
+
+
+/// UCI::wdl() report WDL statistics given an evaluation and a game ply, based on
+/// data gathered for fishtest LTC games.
+
+string UCI::wdl(Value v, int ply) {
+
+ stringstream ss;
+
+ int wdl_w = win_rate_model( v, ply);
+ int wdl_l = win_rate_model(-v, ply);
+ int wdl_d = 1000 - wdl_w - wdl_l;
+ ss << " wdl " << wdl_w << " " << wdl_d << " " << wdl_l;
+
+ return ss.str();
+}
+
+
+/// UCI::square() converts a Square to a string in algebraic notation (g1, a7, etc.)
+
+std::string UCI::square(Square s) {
+ return std::string{ char('a' + file_of(s)), char('1' + rank_of(s)) };
+}
+
+
+/// UCI::move() converts a Move to a string in coordinate notation (g1f3, a7a8q).
+/// The only special case is castling, where we print in the e1g1 notation in
+/// normal chess mode, and in e1h1 notation in chess960 mode. Internally all
+/// castling moves are always encoded as 'king captures rook'.
+
+string UCI::move(Move m, bool chess960) {
+
+ Square from = from_sq(m);
+ Square to = to_sq(m);
+
+ if (m == MOVE_NONE)
+ return "(none)";
+
+ if (m == MOVE_NULL)
+ return "0000";
+
+ if (type_of(m) == CASTLING && !chess960)
+ to = make_square(to > from ? FILE_G : FILE_C, rank_of(from));
+
+ string move = UCI::square(from) + UCI::square(to);
+
+ if (type_of(m) == PROMOTION)
+ move += " pnbrqk"[promotion_type(m)];
+
+ return move;
+}
+
+
+/// UCI::to_move() converts a string representing a move in coordinate notation
+/// (g1f3, a7a8q) to the corresponding legal Move, if any.
+
+Move UCI::to_move(const Position& pos, string& str) {
+
+ if (str.length() == 5) // Junior could send promotion piece in uppercase
+ str[4] = char(tolower(str[4]));
+
+ for (const auto& m : MoveList(pos))
+ if (str == UCI::move(m, pos.is_chess960()))
+ return m;
+
+ return MOVE_NONE;
+}
+
+} // namespace Stockfish