X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fuci.cpp;h=b3738a4a76b8705a668db9bb38bcf879a03ed0d8;hb=HEAD;hp=f62bb8bf4e036bf5222b606c8170017d841f6ea6;hpb=243f7b264a81c2981cec2818b47d609d9d3ca119;p=stockfish diff --git a/src/uci.cpp b/src/uci.cpp index f62bb8bf..c94f8b91 100644 --- a/src/uci.cpp +++ b/src/uci.cpp @@ -1,6 +1,6 @@ /* Stockfish, a UCI chess playing engine derived from Glaurung 2.1 - Copyright (C) 2004-2023 The Stockfish developers (see AUTHORS file) + Copyright (C) 2004-2024 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 @@ -19,156 +19,218 @@ #include "uci.h" #include -#include #include #include #include -#include -#include -#include -#include #include #include -#include +#include +#include #include #include "benchmark.h" -#include "evaluate.h" -#include "misc.h" +#include "engine.h" #include "movegen.h" -#include "nnue/evaluate_nnue.h" #include "position.h" +#include "score.h" #include "search.h" -#include "thread.h" +#include "types.h" +#include "ucioption.h" namespace Stockfish { -namespace { - - // FEN string for the initial position in standard chess - const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"; - - - // position() is called when the engine receives the "position" UCI command. - // It sets up the position that is described in the given FEN string ("fen") or - // the initial position ("startpos") and then makes the moves given in the following - // move list ("moves"). - - void position(Position& pos, std::istringstream& is, StateListPtr& states) { - - Move m; - std::string token, fen; +constexpr auto StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"; +template +struct overload: Ts... { + using Ts::operator()...; +}; - is >> token; +template +overload(Ts...) -> overload; - if (token == "startpos") +void UCIEngine::print_info_string(const std::string& str) { + sync_cout_start(); + for (auto& line : split(str, "\n")) { - fen = StartFEN; - is >> token; // Consume the "moves" token, if any - } - else if (token == "fen") - while (is >> token && token != "moves") - fen += token + " "; - else - return; - - states = StateListPtr(new std::deque(1)); // Drop the old state and create a new one - pos.set(fen, Options["UCI_Chess960"], &states->back(), Threads.main()); - - // Parse the move list, if any - while (is >> token && (m = UCI::to_move(pos, token)) != MOVE_NONE) - { - states->emplace_back(); - pos.do_move(m, states->back()); + if (!is_whitespace(line)) + { + std::cout << "info string " << line << '\n'; + } } - } - - // trace_eval() prints the evaluation of the current position, consistent with - // the UCI options set so far. + sync_cout_end(); +} - void trace_eval(Position& pos) { +UCIEngine::UCIEngine(int argc, char** argv) : + engine(argv[0]), + cli(argc, argv) { - StateListPtr states(new std::deque(1)); - Position p; - p.set(pos.fen(), Options["UCI_Chess960"], &states->back(), Threads.main()); + engine.get_options().add_info_listener([](const std::optional& str) { + if (str.has_value()) + print_info_string(*str); + }); - Eval::NNUE::verify(); + engine.set_on_iter([](const auto& i) { on_iter(i); }); + engine.set_on_update_no_moves([](const auto& i) { on_update_no_moves(i); }); + engine.set_on_update_full( + [this](const auto& i) { on_update_full(i, engine.get_options()["UCI_ShowWDL"]); }); + engine.set_on_bestmove([](const auto& bm, const auto& p) { on_bestmove(bm, p); }); +} - sync_cout << "\n" << Eval::trace(p) << sync_endl; - } +void UCIEngine::loop() { + std::string token, cmd; + for (int i = 1; i < cli.argc; ++i) + cmd += std::string(cli.argv[i]) + " "; - // setoption() is called when the engine receives the "setoption" UCI command. - // The function updates the UCI option ("name") to the given value ("value"). + do + { + if (cli.argc == 1 + && !getline(std::cin, cmd)) // Wait for an input or an end-of-file (EOF) indication + cmd = "quit"; - void setoption(std::istringstream& is) { + std::istringstream is(cmd); - Threads.main()->wait_for_search_finished(); + token.clear(); // Avoid a stale if getline() returns nothing or a blank line + is >> std::skipws >> token; - std::string token, name, value; + if (token == "quit" || token == "stop") + engine.stop(); - is >> token; // Consume the "name" token + // The GUI sends 'ponderhit' to tell that the user has played the expected move. + // So, 'ponderhit' is sent if pondering was done on the same move that the user + // has played. The search should continue, but should also switch from pondering + // to the normal search. + else if (token == "ponderhit") + engine.set_ponderhit(false); - // Read the option name (can contain spaces) - while (is >> token && token != "value") - name += (name.empty() ? "" : " ") + token; + else if (token == "uci") + { + sync_cout << "id name " << engine_info(true) << "\n" + << engine.get_options() << sync_endl; - // Read the option value (can contain spaces) - while (is >> token) - value += (value.empty() ? "" : " ") + token; + sync_cout << "uciok" << sync_endl; + } - if (Options.count(name)) - Options[name] = value; - else - sync_cout << "No such option: " << name << sync_endl; - } + else if (token == "setoption") + setoption(is); + else if (token == "go") + { + // send info strings after the go command is sent for old GUIs and python-chess + print_info_string(engine.numa_config_information_as_string()); + print_info_string(engine.thread_binding_information_as_string()); + go(is); + } + else if (token == "position") + position(is); + else if (token == "ucinewgame") + engine.search_clear(); + else if (token == "isready") + sync_cout << "readyok" << sync_endl; + + // Add custom non-UCI commands, mainly for debugging purposes. + // These commands must not be used during a search! + else if (token == "flip") + engine.flip(); + else if (token == "bench") + bench(is); + else if (token == "d") + sync_cout << engine.visualize() << sync_endl; + else if (token == "eval") + engine.trace_eval(); + else if (token == "compiler") + sync_cout << compiler_info() << sync_endl; + else if (token == "export_net") + { + std::pair, std::string> files[2]; + if (is >> std::skipws >> files[0].second) + files[0].first = files[0].second; - // go() is called when the engine receives the "go" UCI command. The function - // sets the thinking time and other parameters from the input string, then starts - // with a search. + if (is >> std::skipws >> files[1].second) + files[1].first = files[1].second; - void go(Position& pos, std::istringstream& is, StateListPtr& states) { + engine.save_network(files); + } + else if (token == "--help" || token == "help" || token == "--license" || token == "license") + sync_cout + << "\nStockfish is a powerful chess engine for playing and analyzing." + "\nIt is released as free software licensed under the GNU GPLv3 License." + "\nStockfish is normally used with a graphical user interface (GUI) and implements" + "\nthe Universal Chess Interface (UCI) protocol to communicate with a GUI, an API, etc." + "\nFor any further information, visit https://github.com/official-stockfish/Stockfish#readme" + "\nor read the corresponding README.md and Copying.txt files distributed along with this program.\n" + << sync_endl; + else if (!token.empty() && token[0] != '#') + sync_cout << "Unknown command: '" << cmd << "'. Type help for more information." + << sync_endl; + + } while (token != "quit" && cli.argc == 1); // The command-line arguments are one-shot +} +Search::LimitsType UCIEngine::parse_limits(std::istream& is) { Search::LimitsType limits; - std::string token; - bool ponderMode = false; + std::string token; - limits.startTime = now(); // The search starts as early as possible + limits.startTime = now(); // The search starts as early as possible while (is >> token) - if (token == "searchmoves") // Needs to be the last command on the line + if (token == "searchmoves") // Needs to be the last command on the line while (is >> token) - limits.searchmoves.push_back(UCI::to_move(pos, token)); + limits.searchmoves.push_back(to_lower(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") + limits.ponderMode = true; + + return limits; +} - 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; +void UCIEngine::go(std::istringstream& is) { - Threads.start_thinking(pos, states, limits, ponderMode); - } + Search::LimitsType limits = parse_limits(is); + if (limits.perft) + perft(limits); + else + engine.go(limits); +} - // bench() is called when the engine receives the "bench" command. - // First, a list of UCI commands is set up according to the bench - // parameters, then it is run one by one, printing a summary at the end. +void UCIEngine::bench(std::istream& args) { + std::string token; + uint64_t num, nodes = 0, cnt = 1; + uint64_t nodesSearched = 0; + const auto& options = engine.get_options(); - void bench(Position& pos, std::istream& args, StateListPtr& states) { + engine.set_on_update_full([&](const auto& i) { + nodesSearched = i.nodes; + on_update_full(i, options["UCI_ShowWDL"]); + }); - std::string token; - uint64_t num, nodes = 0, cnt = 1; + std::vector list = Benchmark::setup_bench(engine.fen(), args); - std::vector list = setup_bench(pos, args); - num = count_if(list.begin(), list.end(), [](const std::string& s) { return s.find("go ") == 0 || s.find("eval") == 0; }); + num = count_if(list.begin(), list.end(), + [](const std::string& s) { return s.find("go ") == 0 || s.find("eval") == 0; }); TimePoint elapsed = now(); @@ -179,234 +241,253 @@ namespace { if (token == "go" || token == "eval") { - std::cerr << "\nPosition: " << cnt++ << '/' << num << " (" << pos.fen() << ")" << std::endl; + std::cerr << "\nPosition: " << cnt++ << '/' << num << " (" << engine.fen() << ")" + << std::endl; if (token == "go") { - go(pos, is, states); - Threads.main()->wait_for_search_finished(); - nodes += Threads.nodes_searched(); + Search::LimitsType limits = parse_limits(is); + + if (limits.perft) + nodesSearched = perft(limits); + else + { + engine.go(limits); + engine.wait_for_search_finished(); + } + + nodes += nodesSearched; + nodesSearched = 0; } else - trace_eval(pos); + engine.trace_eval(); + } + else if (token == "setoption") + setoption(is); + else if (token == "position") + position(is); + else if (token == "ucinewgame") + { + engine.search_clear(); // search_clear may take a while + elapsed = now(); } - 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 a while } - elapsed = now() - elapsed + 1; // Ensure positivity to avoid a 'divide by zero' + elapsed = now() - elapsed + 1; // Ensure positivity to avoid a 'divide by zero' dbg_print(); - std::cerr << "\n===========================" - << "\nTotal time (ms) : " << elapsed - << "\nNodes searched : " << nodes + std::cerr << "\n===========================" // + << "\nTotal time (ms) : " << elapsed // + << "\nNodes searched : " << nodes // << "\nNodes/second : " << 1000 * nodes / elapsed << std::endl; - } - - // The win rate model returns the probability of winning (in per mille units) given an - // eval and a game ply. It fits the LTC fishtest statistics rather accurately. - int win_rate_model(Value v, int ply) { - - // The model only captures up to 240 plies, so limit the input and then rescale - double m = std::min(240, ply) / 64.0; - - // The coefficients of a third-order polynomial fit is based on the fishtest data - // for two parameters that need to transform eval to the argument of a logistic - // function. - constexpr double as[] = { 0.38036525, -2.82015070, 23.17882135, 307.36768407}; - constexpr double bs[] = { -2.29434733, 13.27689788, -14.26828904, 63.45318330 }; - - // Enforce that NormalizeToPawnValue corresponds to a 50% win rate at ply 64 - static_assert(UCI::NormalizeToPawnValue == int(as[0] + as[1] + as[2] + as[3])); - - 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]; - - // Transform the eval to centipawns with limited range - double x = std::clamp(double(v), -4000.0, 4000.0); - - // Return the win rate in per mille units, rounded to the nearest integer - return int(0.5 + 1000 / (1 + std::exp((a - x) / b))); - } - -} // namespace - - -/// UCI::loop() waits for a command from the stdin, parses it, and then calls the appropriate -/// function. It also intercepts an end-of-file (EOF) indication from the stdin to ensure a -/// graceful exit if the GUI dies unexpectedly. When called with some command-line arguments, -/// like running 'bench', the function returns immediately after the command is executed. -/// In addition to the UCI ones, some additional debug commands are also supported. - -void UCI::loop(int argc, char* argv[]) { - - Position pos; - std::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(std::cin, cmd)) // Wait for an input or an end-of-file (EOF) indication - cmd = "quit"; - - std::istringstream is(cmd); - - token.clear(); // Avoid a stale if getline() returns nothing or a blank line - is >> std::skipws >> token; - - if ( token == "quit" - || token == "stop") - Threads.stop = true; - - // The GUI sends 'ponderhit' to tell that the user has played the expected move. - // So, 'ponderhit' is sent if pondering was done on the same move that the user - // has played. The search should continue, but should also switch from pondering - // to the normal search. - else if (token == "ponderhit") - Threads.main()->ponder = false; // Switch to the 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; - - // Add custom non-UCI commands, mainly for debugging purposes. - // These commands must not be used 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 >> std::skipws >> f) - filename = f; - Eval::NNUE::save_eval(filename); - } - else if (token == "--help" || token == "help" || token == "--license" || token == "license") - sync_cout << "\nStockfish is a powerful chess engine for playing and analyzing." - "\nIt is released as free software licensed under the GNU GPLv3 License." - "\nStockfish is normally used with a graphical user interface (GUI) and implements" - "\nthe Universal Chess Interface (UCI) protocol to communicate with a GUI, an API, etc." - "\nFor any further information, visit https://github.com/official-stockfish/Stockfish#readme" - "\nor read the corresponding README.md and Copying.txt files distributed along with this program.\n" << sync_endl; - else if (!token.empty() && token[0] != '#') - sync_cout << "Unknown command: '" << cmd << "'. Type help for more information." << sync_endl; - - } while (token != "quit" && argc == 1); // The command-line arguments are one-shot + + // reset callback, to not capture a dangling reference to nodesSearched + engine.set_on_update_full([&](const auto& i) { on_update_full(i, options["UCI_ShowWDL"]); }); } -/// Turns a Value to an integer centipawn number, -/// without treatment of mate and similar special scores. -int UCI::to_cp(Value v) { +void UCIEngine::setoption(std::istringstream& is) { + engine.wait_for_search_finished(); + engine.get_options().setoption(is); +} - return 100 * v / UCI::NormalizeToPawnValue; +std::uint64_t UCIEngine::perft(const Search::LimitsType& limits) { + auto nodes = engine.perft(engine.fen(), limits.perft, engine.get_options()["UCI_Chess960"]); + sync_cout << "\nNodes searched: " << nodes << "\n" << sync_endl; + return nodes; } -/// UCI::value() converts a Value to a string by adhering to 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, -/// uses negative values for 'y'. +void UCIEngine::position(std::istringstream& is) { + std::string token, fen; -std::string UCI::value(Value v) { + is >> token; - assert(-VALUE_INFINITE < v && v < VALUE_INFINITE); + if (token == "startpos") + { + fen = StartFEN; + is >> token; // Consume the "moves" token, if any + } + else if (token == "fen") + while (is >> token && token != "moves") + fen += token + " "; + else + return; - std::stringstream ss; + std::vector moves; - if (abs(v) < VALUE_TB_WIN_IN_MAX_PLY) - ss << "cp " << UCI::to_cp(v); - else if (abs(v) < VALUE_MATE_IN_MAX_PLY) - { - const int ply = VALUE_MATE_IN_MAX_PLY - 1 - std::abs(v); // recompute ss->ply - ss << "cp " << (v > 0 ? 20000 - ply : -20000 + ply); - } - else - ss << "mate " << (v > 0 ? VALUE_MATE - v + 1 : -VALUE_MATE - v) / 2; + while (is >> token) + { + moves.push_back(token); + } - return ss.str(); + engine.set_position(fen, moves); } +namespace { + +struct WinRateParams { + double a; + double b; +}; + +WinRateParams win_rate_params(const Position& pos) { -/// UCI::wdl() reports the win-draw-loss (WDL) statistics given an evaluation -/// and a game ply based on the data gathered for fishtest LTC games. + int material = pos.count() + 3 * pos.count() + 3 * pos.count() + + 5 * pos.count() + 9 * pos.count(); -std::string UCI::wdl(Value v, int ply) { + // The fitted model only uses data for material counts in [17, 78], and is anchored at count 58. + double m = std::clamp(material, 17, 78) / 58.0; - std::stringstream ss; + // Return a = p_a(material) and b = p_b(material), see github.com/official-stockfish/WDL_model + constexpr double as[] = {-37.45051876, 121.19101539, -132.78783573, 420.70576692}; + constexpr double bs[] = {90.26261072, -137.26549898, 71.10130540, 51.35259597}; - 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; + 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]; - return ss.str(); + return {a, b}; } +// The win rate model is 1 / (1 + exp((a - eval) / b)), where a = p_a(material) and b = p_b(material). +// It fits the LTC fishtest statistics rather accurately. +int win_rate_model(Value v, const Position& pos) { -/// UCI::square() converts a Square to a string in algebraic notation (g1, a7, etc.) + auto [a, b] = win_rate_params(pos); -std::string UCI::square(Square s) { - return std::string{ char('a' + file_of(s)), char('1' + rank_of(s)) }; + // Return the win rate in per mille units, rounded to the nearest integer. + return int(0.5 + 1000 / (1 + std::exp((a - double(v)) / b))); +} } +std::string UCIEngine::format_score(const Score& s) { + constexpr int TB_CP = 20000; + const auto format = + overload{[](Score::Mate mate) -> std::string { + auto m = (mate.plies > 0 ? (mate.plies + 1) : mate.plies) / 2; + return std::string("mate ") + std::to_string(m); + }, + [](Score::Tablebase tb) -> std::string { + return std::string("cp ") + + std::to_string((tb.win ? TB_CP - tb.plies : -TB_CP - tb.plies)); + }, + [](Score::InternalUnits units) -> std::string { + return std::string("cp ") + std::to_string(units.value); + }}; + + return s.visit(format); +} -/// UCI::move() converts a Move to a string in coordinate notation (g1f3, a7a8q). -/// The only special case is castling where the e1g1 notation is printed in -/// standard chess mode and in e1h1 notation it is printed in Chess960 mode. -/// Internally, all castling moves are always encoded as 'king captures rook'. +// Turns a Value to an integer centipawn number, +// without treatment of mate and similar special scores. +int UCIEngine::to_cp(Value v, const Position& pos) { -std::string UCI::move(Move m, bool chess960) { + // In general, the score can be defined via the WDL as + // (log(1/L - 1) - log(1/W - 1)) / (log(1/L - 1) + log(1/W - 1)). + // Based on our win_rate_model, this simply yields v / a. - if (m == MOVE_NONE) - return "(none)"; + auto [a, b] = win_rate_params(pos); - if (m == MOVE_NULL) - return "0000"; + return std::round(100 * int(v) / a); +} - Square from = from_sq(m); - Square to = to_sq(m); +std::string UCIEngine::wdl(Value v, const Position& pos) { + std::stringstream ss; - if (type_of(m) == CASTLING && !chess960) - to = make_square(to > from ? FILE_G : FILE_C, rank_of(from)); + int wdl_w = win_rate_model(v, pos); + int wdl_l = win_rate_model(-v, pos); + int wdl_d = 1000 - wdl_w - wdl_l; + ss << wdl_w << " " << wdl_d << " " << wdl_l; - std::string move = UCI::square(from) + UCI::square(to); + return ss.str(); +} - if (type_of(m) == PROMOTION) - move += " pnbrqk"[promotion_type(m)]; +std::string UCIEngine::square(Square s) { + return std::string{char('a' + file_of(s)), char('1' + rank_of(s))}; +} - return move; +std::string UCIEngine::move(Move m, bool chess960) { + if (m == Move::none()) + return "(none)"; + + if (m == Move::null()) + return "0000"; + + Square from = m.from_sq(); + Square to = m.to_sq(); + + if (m.type_of() == CASTLING && !chess960) + to = make_square(to > from ? FILE_G : FILE_C, rank_of(from)); + + std::string move = square(from) + square(to); + + if (m.type_of() == PROMOTION) + move += " pnbrqk"[m.promotion_type()]; + + return move; +} + + +std::string UCIEngine::to_lower(std::string str) { + std::transform(str.begin(), str.end(), str.begin(), [](auto c) { return std::tolower(c); }); + + return str; +} + +Move UCIEngine::to_move(const Position& pos, std::string str) { + str = to_lower(str); + + for (const auto& m : MoveList(pos)) + if (str == move(m, pos.is_chess960())) + return m; + + return Move::none(); } +void UCIEngine::on_update_no_moves(const Engine::InfoShort& info) { + sync_cout << "info depth " << info.depth << " score " << format_score(info.score) << sync_endl; +} + +void UCIEngine::on_update_full(const Engine::InfoFull& info, bool showWDL) { + std::stringstream ss; + + ss << "info"; + ss << " depth " << info.depth // + << " seldepth " << info.selDepth // + << " multipv " << info.multiPV // + << " score " << format_score(info.score); // -/// UCI::to_move() converts a string representing a move in coordinate notation -/// (g1f3, a7a8q) to the corresponding legal Move, if any. + if (showWDL) + ss << " wdl " << info.wdl; -Move UCI::to_move(const Position& pos, std::string& str) { + if (!info.bound.empty()) + ss << " " << info.bound; - if (str.length() == 5) - str[4] = char(tolower(str[4])); // The promotion piece character must be lowercased + ss << " nodes " << info.nodes // + << " nps " << info.nps // + << " hashfull " << info.hashfull // + << " tbhits " << info.tbHits // + << " time " << info.timeMs // + << " pv " << info.pv; // - for (const auto& m : MoveList(pos)) - if (str == UCI::move(m, pos.is_chess960())) - return m; + sync_cout << ss.str() << sync_endl; +} + +void UCIEngine::on_iter(const Engine::InfoIter& info) { + std::stringstream ss; + + ss << "info"; + ss << " depth " << info.depth // + << " currmove " << info.currmove // + << " currmovenumber " << info.currmovenumber; // + + sync_cout << ss.str() << sync_endl; +} - return MOVE_NONE; +void UCIEngine::on_bestmove(std::string_view bestmove, std::string_view ponder) { + sync_cout << "bestmove " << bestmove; + if (!ponder.empty()) + std::cout << " ponder " << ponder; + std::cout << sync_endl; } -} // namespace Stockfish +} // namespace Stockfish