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
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.
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.
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/>.
32 #include "syzygy/tbprobe.h"
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"
42 using grpc::ServerBuilder;
43 using grpc::ServerContext;
45 using grpc::StatusCode;
46 using namespace hashprobe;
48 Status HashProbeImpl::Probe(ServerContext* context,
49 const HashProbeRequest* request,
50 HashProbeResponse *response) {
53 pos.set(request->fen(), /*isChess960=*/false, &st, Threads.main());
54 if (!pos.pos_is_ok()) {
55 return Status(StatusCode::INVALID_ARGUMENT, "Invalid FEN");
58 bool invert = (pos.side_to_move() == BLACK);
59 StateListPtr setup_states = StateListPtr(new std::deque<StateInfo>(1));
61 ProbeMove(&pos, setup_states.get(), invert, response->mutable_root());
63 MoveList<LEGAL> moves(pos);
64 for (const ExtMove* em = moves.begin(); em != moves.end(); ++em) {
65 HashProbeLine *line = response->add_line();
66 FillMove(&pos, em->move, line->mutable_move());
67 setup_states->push_back(StateInfo());
68 pos.do_move(em->move, setup_states->back());
69 ProbeMove(&pos, setup_states.get(), !invert, line);
70 pos.undo_move(em->move);
76 void HashProbeImpl::FillMove(Position *pos, Move move, HashProbeMove* decoded) {
77 if (!is_ok(move)) return;
79 Square from = from_sq(move);
80 Square to = to_sq(move);
82 if (type_of(move) == CASTLING) {
83 to = make_square(to > from ? FILE_G : FILE_C, rank_of(from));
86 Piece moved_piece = pos->moved_piece(move);
88 if (type_of(move) == CASTLING) {
94 } else if (type_of(moved_piece) == PAWN) {
95 if (type_of(move) == ENPASSANT || pos->piece_on(to) != NO_PIECE) {
97 pretty = char('a' + file_of(from));
100 pretty += UCI::square(to);
101 if (type_of(move) == PROMOTION) {
103 pretty += " PNBRQK"[promotion_type(move)];
106 pretty = " PNBRQK"[type_of(moved_piece)];
107 Bitboard attackers = pos->attackers_to(to) & pos->pieces(color_of(moved_piece), type_of(moved_piece));
108 if (more_than_one(attackers)) {
109 // Remove all illegal moves to disambiguate.
110 Bitboard att_copy = attackers;
112 Square s = pop_lsb(&att_copy);
113 Move m = make_move(s, to);
114 if (!pos->pseudo_legal(m) || !pos->legal(m)) {
115 attackers &= ~SquareBB[s];
119 if (more_than_one(attackers)) {
120 // Disambiguate by file if possible.
121 Bitboard attackers_this_file = attackers & file_bb(file_of(from));
122 if (attackers != attackers_this_file) {
123 pretty += char('a' + file_of(from));
124 attackers = attackers_this_file;
126 if (more_than_one(attackers)) {
127 // Still ambiguous, so need to disambiguate by rank.
128 pretty += char('1' + rank_of(from));
132 if (type_of(move) == ENPASSANT || pos->piece_on(to) != NO_PIECE) {
136 pretty += UCI::square(to);
139 if (pos->gives_check(move)) {
142 pos->do_move(move, si, true);
143 if (MoveList<LEGAL>(*pos).size() > 0) {
148 pos->undo_move(move);
151 decoded->set_pretty(pretty);
154 void HashProbeImpl::ProbeMove(Position* pos, std::deque<StateInfo>* setup_states, bool invert, HashProbeLine* response) {
156 TTEntry *entry = TT.probe(pos->key(), found);
157 response->set_found(found);
159 Value value = entry->value();
160 Value eval = entry->eval();
161 Bound bound = entry->bound();
166 if (bound == BOUND_UPPER) {
168 } else if (bound == BOUND_LOWER) {
173 response->set_depth(entry->depth());
174 FillValue(eval, response->mutable_eval());
175 if (entry->depth() > DEPTH_NONE) {
176 FillValue(value, response->mutable_value());
178 response->set_bound(HashProbeLine::ValueBound(bound));
180 // Follow the PV until we hit an illegal move.
183 while (found && is_ok(entry->move()) &&
184 pos->pseudo_legal(entry->move()) &&
185 pos->legal(entry->move())) {
186 FillMove(pos, entry->move(), response->add_pv());
187 if (seen.count(pos->key())) break;
188 pv.push(entry->move());
189 seen.insert(pos->key());
190 setup_states->push_back(StateInfo());
191 pos->do_move(entry->move(), setup_states->back());
192 entry = TT.probe(pos->key(), found);
195 // Unroll the PV back again, so the Position object remains unchanged.
196 while (!pv.empty()) {
197 pos->undo_move(pv.top());
203 void HashProbeImpl::FillValue(Value value, HashProbeScore* score) {
204 if (abs(value) < VALUE_MATE - MAX_PLY) {
205 score->set_score_type(HashProbeScore::SCORE_CP);
206 score->set_score_cp(value * 100 / PawnValueEg);
208 score->set_score_type(HashProbeScore::SCORE_MATE);
209 score->set_score_mate((value > 0 ? VALUE_MATE - value + 1 : -VALUE_MATE - value) / 2);
213 HashProbeThread::HashProbeThread(const std::string &server_address) {
214 builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
215 builder.RegisterService(&service);
216 server = std::move(builder.BuildAndStart());
217 std::cout << "Server listening on " << server_address << std::endl;
218 std::thread([this]{ server->Wait(); }).detach();
221 void HashProbeThread::Shutdown() {
229 int main(int argc, char* argv[]) {
231 std::cout << engine_info() << std::endl;
240 Threads.set(Options["Threads"]);
241 Search::clear(); // After threads are up
243 UCI::loop(argc, argv);