2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #if !defined(SEARCH_H_INCLUDED)
21 #define SEARCH_H_INCLUDED
36 /// The Stack struct keeps track of the information we need to remember from
37 /// nodes shallower and deeper in the tree during the search. Each search thread
38 /// has its own array of Stack objects, indexed by the current ply.
53 /// RootMove struct is used for moves at the root of the tree. For each root
54 /// move we store a score, a node count, and a PV (really a refutation in the
55 /// case of moves which fail low). Score is normally set at -VALUE_INFINITE for
59 RootMove(){} // Needed by sort()
60 RootMove(Move m) : score(-VALUE_INFINITE), prevScore(-VALUE_INFINITE) {
61 pv.push_back(m); pv.push_back(MOVE_NONE);
64 bool operator<(const RootMove& m) const { return score < m.score; }
65 bool operator==(const Move& m) const { return pv[0] == m; }
67 void extract_pv_from_tt(Position& pos);
68 void insert_pv_in_tt(Position& pos);
76 /// The LimitsType struct stores information sent by GUI about available time
77 /// to search the current move, maximum depth/time, if we are in analysis mode
78 /// or if we have to ponder while is our opponent's side to move.
82 LimitsType() { memset(this, 0, sizeof(LimitsType)); }
83 bool use_time_management() const { return !(mate | movetime | depth | nodes | infinite); }
85 int time[COLOR_NB], inc[COLOR_NB], movestogo, depth, nodes, movetime, mate, infinite, ponder;
89 /// The SignalsType struct stores volatile flags updated during the search
90 /// typically in an async fashion, for instance to stop the search by the GUI.
93 bool stopOnPonderhit, firstRootMove, stop, failedLowAtRoot;
96 typedef std::auto_ptr<std::stack<StateInfo> > StateStackPtr;
98 extern volatile SignalsType Signals;
99 extern LimitsType Limits;
100 extern std::vector<RootMove> RootMoves;
101 extern Position RootPos;
102 extern Color RootColor;
103 extern Time::point SearchTime;
104 extern StateStackPtr SetupStates;
107 extern size_t perft(Position& pos, Depth depth);
110 } // namespace Search
112 #endif // !defined(SEARCH_H_INCLUDED)