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    1 /*
    2   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
    3   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
    4   Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
    5   Copyright (C) 2015-2020 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
    6 
    7   Stockfish is free software: you can redistribute it and/or modify
    8   it under the terms of the GNU General Public License as published by
    9   the Free Software Foundation, either version 3 of the License, or
   10   (at your option) any later version.
   11 
   12   Stockfish is distributed in the hope that it will be useful,
   13   but WITHOUT ANY WARRANTY; without even the implied warranty of
   14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15   GNU General Public License for more details.
   16 
   17   You should have received a copy of the GNU General Public License
   18   along with this program.  If not, see <http://www.gnu.org/licenses/>.
   19 */
   20 
   21 #include <cassert>
   22 #include <iostream>
   23 #include <sstream>
   24 #include <string>
   25 
   26 #include "evaluate.h"
   27 #include "movegen.h"
   28 #include "position.h"
   29 #include "search.h"
   30 #include "thread.h"
   31 #include "timeman.h"
   32 #include "tt.h"
   33 #include "uci.h"
   34 #include "syzygy/tbprobe.h"
   35 
   36 using namespace std;
   37 
   38 extern vector<string> setup_bench(const Position&, istream&);
   39 
   40 namespace {
   41 
   42   // FEN string of the initial position, normal chess
   43   const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
   44 
   45 
   46   // position() is called when engine receives the "position" UCI command.
   47   // The function sets up the position described in the given FEN string ("fen")
   48   // or the starting position ("startpos") and then makes the moves given in the
   49   // following move list ("moves").
   50 
   51   void position(Position& pos, istringstream& is, StateListPtr& states) {
   52 
   53     Move m;
   54     string token, fen;
   55 
   56     is >> token;
   57 
   58     if (token == "startpos")
   59     {
   60         fen = StartFEN;
   61         is >> token; // Consume "moves" token if any
   62     }
   63     else if (token == "fen")
   64         while (is >> token && token != "moves")
   65             fen += token + " ";
   66     else
   67         return;
   68 
   69     states = StateListPtr(new std::deque<StateInfo>(1)); // Drop old and create a new one
   70     pos.set(fen, Options["UCI_Chess960"], &states->back(), Threads.main());
   71 
   72     // Parse move list (if any)
   73     while (is >> token && (m = UCI::to_move(pos, token)) != MOVE_NONE)
   74     {
   75         states->emplace_back();
   76         pos.do_move(m, states->back());
   77     }
   78   }
   79 
   80 
   81   // setoption() is called when engine receives the "setoption" UCI command. The
   82   // function updates the UCI option ("name") to the given value ("value").
   83 
   84   void setoption(istringstream& is) {
   85 
   86     string token, name, value;
   87 
   88     is >> token; // Consume "name" token
   89 
   90     // Read option name (can contain spaces)
   91     while (is >> token && token != "value")
   92         name += (name.empty() ? "" : " ") + token;
   93 
   94     // Read option value (can contain spaces)
   95     while (is >> token)
   96         value += (value.empty() ? "" : " ") + token;
   97 
   98     if (Options.count(name))
   99         Options[name] = value;
  100     else
  101         sync_cout << "No such option: " << name << sync_endl;
  102   }
  103 
  104 
  105   // go() is called when engine receives the "go" UCI command. The function sets
  106   // the thinking time and other parameters from the input string, then starts
  107   // the search.
  108 
  109   void go(Position& pos, istringstream& is, StateListPtr& states) {
  110 
  111     Search::LimitsType limits;
  112     string token;
  113     bool ponderMode = false;
  114 
  115     limits.startTime = now(); // As early as possible!
  116 
  117     while (is >> token)
  118         if (token == "searchmoves")
  119             while (is >> token)
  120                 limits.searchmoves.push_back(UCI::to_move(pos, token));
  121 
  122         else if (token == "wtime")     is >> limits.time[WHITE];
  123         else if (token == "btime")     is >> limits.time[BLACK];
  124         else if (token == "winc")      is >> limits.inc[WHITE];
  125         else if (token == "binc")      is >> limits.inc[BLACK];
  126         else if (token == "movestogo") is >> limits.movestogo;
  127         else if (token == "depth")     is >> limits.depth;
  128         else if (token == "nodes")     is >> limits.nodes;
  129         else if (token == "movetime")  is >> limits.movetime;
  130         else if (token == "mate")      is >> limits.mate;
  131         else if (token == "perft")     is >> limits.perft;
  132         else if (token == "infinite")  limits.infinite = 1;
  133         else if (token == "ponder")    ponderMode = true;
  134 
  135     Threads.start_thinking(pos, states, limits, ponderMode);
  136   }
  137 
  138 
  139   // bench() is called when engine receives the "bench" command. Firstly
  140   // a list of UCI commands is setup according to bench parameters, then
  141   // it is run one by one printing a summary at the end.
  142 
  143   void bench(Position& pos, istream& args, StateListPtr& states) {
  144 
  145     string token;
  146     uint64_t num, nodes = 0, cnt = 1;
  147 
  148     vector<string> list = setup_bench(pos, args);
  149     num = count_if(list.begin(), list.end(), [](string s) { return s.find("go ") == 0 || s.find("eval") == 0; });
  150 
  151     TimePoint elapsed = now();
  152 
  153     for (const auto& cmd : list)
  154     {
  155         istringstream is(cmd);
  156         is >> skipws >> token;
  157 
  158         if (token == "go" || token == "eval")
  159         {
  160             cerr << "\nPosition: " << cnt++ << '/' << num << endl;
  161             if (token == "go")
  162             {
  163                go(pos, is, states);
  164                Threads.main()->wait_for_search_finished();
  165                nodes += Threads.nodes_searched();
  166             }
  167             else
  168                sync_cout << "\n" << Eval::trace(pos) << sync_endl;
  169         }
  170         else if (token == "setoption")  setoption(is);
  171         else if (token == "position")   position(pos, is, states);
  172         else if (token == "ucinewgame") { Search::clear(); elapsed = now(); } // Search::clear() may take some while
  173     }
  174 
  175     elapsed = now() - elapsed + 1; // Ensure positivity to avoid a 'divide by zero'
  176 
  177     dbg_print(); // Just before exiting
  178 
  179     cerr << "\n==========================="
  180          << "\nTotal time (ms) : " << elapsed
  181          << "\nNodes searched  : " << nodes
  182          << "\nNodes/second    : " << 1000 * nodes / elapsed << endl;
  183   }
  184 
  185 } // namespace
  186 
  187 
  188 /// UCI::loop() waits for a command from stdin, parses it and calls the appropriate
  189 /// function. Also intercepts EOF from stdin to ensure gracefully exiting if the
  190 /// GUI dies unexpectedly. When called with some command line arguments, e.g. to
  191 /// run 'bench', once the command is executed the function returns immediately.
  192 /// In addition to the UCI ones, also some additional debug commands are supported.
  193 
  194 void UCI::loop(int argc, char* argv[]) {
  195 
  196   Position pos;
  197   string token, cmd;
  198   StateListPtr states(new std::deque<StateInfo>(1));
  199 
  200   pos.set(StartFEN, false, &states->back(), Threads.main());
  201 
  202   for (int i = 1; i < argc; ++i)
  203       cmd += std::string(argv[i]) + " ";
  204 
  205   do {
  206       if (argc == 1 && !getline(cin, cmd)) // Block here waiting for input or EOF
  207           cmd = "quit";
  208 
  209       istringstream is(cmd);
  210 
  211       token.clear(); // Avoid a stale if getline() returns empty or blank line
  212       is >> skipws >> token;
  213 
  214       if (    token == "quit"
  215           ||  token == "stop")
  216           Threads.stop = true;
  217 
  218       // The GUI sends 'ponderhit' to tell us the user has played the expected move.
  219       // So 'ponderhit' will be sent if we were told to ponder on the same move the
  220       // user has played. We should continue searching but switch from pondering to
  221       // normal search.
  222       else if (token == "ponderhit")
  223           Threads.main()->ponder = false; // Switch to normal search
  224 
  225       else if (token == "uci")
  226           sync_cout << "id name " << engine_info(true)
  227                     << "\n"       << Options
  228                     << "\nuciok"  << sync_endl;
  229 
  230       else if (token == "setoption")  setoption(is);
  231       else if (token == "go")         go(pos, is, states);
  232       else if (token == "position")   position(pos, is, states);
  233       else if (token == "ucinewgame") Search::clear();
  234       else if (token == "isready")    sync_cout << "readyok" << sync_endl;
  235 
  236       // Additional custom non-UCI commands, mainly for debugging.
  237       // Do not use these commands during a search!
  238       else if (token == "flip")     pos.flip();
  239       else if (token == "bench")    bench(pos, is, states);
  240       else if (token == "d")        sync_cout << pos << sync_endl;
  241       else if (token == "eval")     sync_cout << Eval::trace(pos) << sync_endl;
  242       else if (token == "compiler") sync_cout << compiler_info() << sync_endl;
  243       else
  244           sync_cout << "Unknown command: " << cmd << sync_endl;
  245 
  246   } while (token != "quit" && argc == 1); // Command line args are one-shot
  247 }
  248 
  249 
  250 /// UCI::value() converts a Value to a string suitable for use with the UCI
  251 /// protocol specification:
  252 ///
  253 /// cp <x>    The score from the engine's point of view in centipawns.
  254 /// mate <y>  Mate in y moves, not plies. If the engine is getting mated
  255 ///           use negative values for y.
  256 
  257 string UCI::value(Value v) {
  258 
  259   assert(-VALUE_INFINITE < v && v < VALUE_INFINITE);
  260 
  261   stringstream ss;
  262 
  263   if (abs(v) < VALUE_MATE - MAX_PLY)
  264       ss << "cp " << v * 100 / PawnValueEg;
  265   else
  266       ss << "mate " << (v > 0 ? VALUE_MATE - v + 1 : -VALUE_MATE - v) / 2;
  267 
  268   return ss.str();
  269 }
  270 
  271 
  272 /// UCI::square() converts a Square to a string in algebraic notation (g1, a7, etc.)
  273 
  274 std::string UCI::square(Square s) {
  275   return std::string{ char('a' + file_of(s)), char('1' + rank_of(s)) };
  276 }
  277 
  278 
  279 /// UCI::move() converts a Move to a string in coordinate notation (g1f3, a7a8q).
  280 /// The only special case is castling, where we print in the e1g1 notation in
  281 /// normal chess mode, and in e1h1 notation in chess960 mode. Internally all
  282 /// castling moves are always encoded as 'king captures rook'.
  283 
  284 string UCI::move(Move m, bool chess960) {
  285 
  286   Square from = from_sq(m);
  287   Square to = to_sq(m);
  288 
  289   if (m == MOVE_NONE)
  290       return "(none)";
  291 
  292   if (m == MOVE_NULL)
  293       return "0000";
  294 
  295   if (type_of(m) == CASTLING && !chess960)
  296       to = make_square(to > from ? FILE_G : FILE_C, rank_of(from));
  297 
  298   string move = UCI::square(from) + UCI::square(to);
  299 
  300   if (type_of(m) == PROMOTION)
  301       move += " pnbrqk"[promotion_type(m)];
  302 
  303   return move;
  304 }
  305 
  306 
  307 /// UCI::to_move() converts a string representing a move in coordinate notation
  308 /// (g1f3, a7a8q) to the corresponding legal Move, if any.
  309 
  310 Move UCI::to_move(const Position& pos, string& str) {
  311 
  312   if (str.length() == 5) // Junior could send promotion piece in uppercase
  313       str[4] = char(tolower(str[4]));
  314 
  315   for (const auto& m : MoveList<LEGAL>(pos))
  316       if (str == UCI::move(m, pos.is_chess960()))
  317           return m;
  318 
  319   return MOVE_NONE;
  320 }