git.sesse.net Git - stockfish/blob - src/main.cpp

   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) 2015-2019 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 <deque>
  22 #include <iostream>
  23 #include <stack>
  24 #include <thread>
  25
  26 #include "bitboard.h"
  27 #include "position.h"
  28 #include "search.h"
  29 #include "thread.h"
  30 #include "tt.h"
  31 #include "uci.h"
  32 #include "syzygy/tbprobe.h"
  33
  34 #include <grpc/grpc.h>
  35 #include <grpc++/server.h>
  36 #include <grpc++/server_builder.h>
  37 #include "hashprobe.h"
  38 #include "hashprobe.grpc.pb.h"
  39
  40 using grpc::Server;
  41 using grpc::ServerBuilder;
  42 using grpc::ServerContext;
  43 using grpc::Status;
  44 using grpc::StatusCode;
  45 using namespace hashprobe;
  46
  47 Status HashProbeImpl::Probe(ServerContext* context,
  48                             const HashProbeRequest* request,
  49                             HashProbeResponse *response) {
  50         Position pos;
  51         StateInfo st;
  52         pos.set(request->fen(), /*isChess960=*/false, &st, Threads.main());
  53         if (!pos.pos_is_ok()) {
  54                 return Status(StatusCode::INVALID_ARGUMENT, "Invalid FEN");
  55         }
  56
  57         bool invert = (pos.side_to_move() == BLACK);
  58         StateListPtr setup_states = StateListPtr(new std::deque<StateInfo>(1));
  59
  60         ProbeMove(&pos, setup_states.get(), invert, response->mutable_root());
  61
  62         MoveList<LEGAL> moves(pos);
  63         for (const ExtMove* em = moves.begin(); em != moves.end(); ++em) {
  64                 HashProbeLine *line = response->add_line();
  65                 FillMove(&pos, em->move, line->mutable_move());
  66                 setup_states->push_back(StateInfo());
  67                 pos.do_move(em->move, setup_states->back(), pos.gives_check(em->move));
  68                 ProbeMove(&pos, setup_states.get(), !invert, line);
  69                 pos.undo_move(em->move);
  70         }
  71
  72         return Status::OK;
  73 }
  74
  75 void HashProbeImpl::FillMove(Position *pos, Move move, HashProbeMove* decoded) {
  76         if (!is_ok(move)) return;
  77
  78         Square from = from_sq(move);
  79         Square to = to_sq(move);
  80
  81         if (type_of(move) == CASTLING) {
  82                 to = make_square(to > from ? FILE_G : FILE_C, rank_of(from));
  83         }
  84
  85         decoded->set_from_sq(UCI::square(from));
  86         decoded->set_to_sq(UCI::square(to));
  87
  88         if (type_of(move) == PROMOTION) {
  89                 decoded->set_promotion(std::string() + " PNBRQK"[promotion_type(move)]);
  90         }
  91
  92         Piece moved_piece = pos->moved_piece(move);
  93         std::string pretty;
  94         if (type_of(move) == CASTLING) {
  95                 if (to > from) {
  96                         pretty = "O-O";
  97                 } else {
  98                         pretty = "O-O-O";
  99                 }
 100         } else if (type_of(moved_piece) == PAWN) {
 101                 if (type_of(move) == ENPASSANT || pos->piece_on(to) != NO_PIECE) {
 102                         // Capture.
 103                         pretty = char('a' + file_of(from));
 104                         pretty += "x";
 105                 }
 106                 pretty += UCI::square(to);
 107                 if (type_of(move) == PROMOTION) {
 108                         pretty += "=";
 109                         pretty += " PNBRQK"[promotion_type(move)];
 110                 }
 111         } else {
 112                 pretty = " PNBRQK"[type_of(moved_piece)];
 113                 Bitboard attackers = pos->attackers_to(to) & pos->pieces(color_of(moved_piece), type_of(moved_piece));
 114                 if (more_than_one(attackers)) {
 115                         // Remove all illegal moves to disambiguate.
 116                         Bitboard att_copy = attackers;
 117                         while (att_copy) {
 118                                 Square s = pop_lsb(&att_copy);
 119                                 Move m = make_move(s, to);
 120                                 if (!pos->pseudo_legal(m) || !pos->legal(m)) {
 121                                         attackers &= ~SquareBB[s];
 122                                 }
 123                         }
 124                 }
 125                 if (more_than_one(attackers)) {
 126                         // Disambiguate by file if possible.
 127                         Bitboard attackers_this_file = attackers & file_bb(file_of(from));
 128                         if (attackers != attackers_this_file) {
 129                                 pretty += char('a' + file_of(from));
 130                                 attackers = attackers_this_file;
 131                         }
 132                         if (more_than_one(attackers)) {
 133                                 // Still ambiguous, so need to disambiguate by rank.
 134                                 pretty += char('1' + rank_of(from));
 135                         }
 136                 }
 137
 138                 if (type_of(move) == ENPASSANT || pos->piece_on(to) != NO_PIECE) {
 139                         pretty += "x";
 140                 }
 141
 142                 pretty += UCI::square(to);
 143         }
 144
 145         if (pos->gives_check(move)) {
 146                 // Check if mate.
 147                 StateInfo si;
 148                 pos->do_move(move, si, true);
 149                 if (MoveList<LEGAL>(*pos).size() > 0) {
 150                         pretty += "+";
 151                 } else {
 152                         pretty += "#";
 153                 }
 154                 pos->undo_move(move);
 155         }
 156
 157         decoded->set_pretty(pretty);
 158 }
 159
 160 void HashProbeImpl::ProbeMove(Position* pos, std::deque<StateInfo>* setup_states, bool invert, HashProbeLine* response) {
 161         bool found;
 162         TTEntry *entry = TT.probe(pos->key(), found);
 163         response->set_found(found);
 164         if (found) {
 165                 Value value = entry->value();
 166                 Value eval = entry->eval();
 167                 Bound bound = entry->bound();
 168
 169                 if (invert) {
 170                         value = -value;
 171                         eval = -eval;
 172                         if (bound == BOUND_UPPER) {
 173                                 bound = BOUND_LOWER;
 174                         } else if (bound == BOUND_LOWER) {
 175                                 bound = BOUND_UPPER;
 176                         }
 177                 }
 178
 179                 response->set_depth(entry->depth());
 180                 FillValue(eval, response->mutable_eval());
 181                 if (entry->depth() > DEPTH_NONE) {
 182                         FillValue(value, response->mutable_value());
 183                 }
 184                 response->set_bound(HashProbeLine::ValueBound(bound));
 185
 186                 // Follow the PV until we hit an illegal move.
 187                 std::stack<Move> pv;
 188                 std::set<Key> seen;
 189                 while (found && is_ok(entry->move()) &&
 190                        pos->pseudo_legal(entry->move()) &&
 191                        pos->legal(entry->move())) {
 192                         FillMove(pos, entry->move(), response->add_pv());
 193                         if (seen.count(pos->key())) break;
 194                         pv.push(entry->move());
 195                         seen.insert(pos->key());
 196                         setup_states->push_back(StateInfo());
 197                         pos->do_move(entry->move(), setup_states->back(), pos->gives_check(entry->move()));
 198                         entry = TT.probe(pos->key(), found);
 199                 }
 200
 201                 // Unroll the PV back again, so the Position object remains unchanged.
 202                 while (!pv.empty()) {
 203                         pos->undo_move(pv.top());
 204                         pv.pop();
 205                 }
 206         }
 207 }
 208
 209 void HashProbeImpl::FillValue(Value value, HashProbeScore* score) {
 210         if (abs(value) < VALUE_MATE - MAX_PLY) {
 211                 score->set_score_type(HashProbeScore::SCORE_CP);
 212                 score->set_score_cp(value * 100 / PawnValueEg);
 213         } else {
 214                 score->set_score_type(HashProbeScore::SCORE_MATE);
 215                 score->set_score_mate((value > 0 ? VALUE_MATE - value + 1 : -VALUE_MATE - value) / 2);
 216         }
 217 }
 218
 219 HashProbeThread::HashProbeThread(const std::string &server_address) {
 220         builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
 221         builder.RegisterService(&service);
 222         server = std::move(builder.BuildAndStart());
 223         std::cout << "Server listening on " << server_address << std::endl;
 224         std::thread([this]{ server->Wait(); }).detach();
 225 }
 226
 227 void HashProbeThread::Shutdown() {
 228         server->Shutdown();
 229 }
 230
 231 namespace PSQT {
 232   void init();
 233 }
 234
 235 int main(int argc, char* argv[]) {
 236
 237   std::cout << engine_info() << std::endl;
 238
 239   UCI::init(Options);
 240   PSQT::init();
 241   Bitboards::init();
 242   Position::init();
 243   Bitbases::init();
 244   Search::init();
 245   Pawns::init();
 246   Threads.set(Options["Threads"]);
 247   Search::clear(); // After threads are up
 248
 249   UCI::loop(argc, argv);
 250
 251   Threads.set(0);
 252   return 0;
 253 }