Introduce separate counter-move tables for inCheck

[stockfish] / src / search.h

diff --git a/src/search.h b/src/search.h
index 2fd160b68a6d9ab5a58f45e8321880c9ab3d9b98..c77ca3ad8991dfea8568f2e70d054fe4c9b8ac96 100644 (file)
--- a/src/search.h
+++ b/src/search.h
@@ -1,7 +1,8 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2014 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -20,94 +21,88 @@
 #ifndef SEARCH_H_INCLUDED
 #define SEARCH_H_INCLUDED
 
-#include <memory>
-#include <stack>
 #include <vector>
 
 #include "misc.h"
-#include "position.h"
+#include "movepick.h"
 #include "types.h"
 
-struct SplitPoint;
+class Position;
 
 namespace Search {
 
-/// The Stack struct keeps track of the information we need to remember from
-/// nodes shallower and deeper in the tree during the search. Each search thread
-/// has its own array of Stack objects, indexed by the current ply.
+/// Threshold used for countermoves based pruning
+constexpr int CounterMovePruneThreshold = 0;
+
+
+/// Stack struct keeps track of the information we need to remember from nodes
+/// shallower and deeper in the tree during the search. Each search thread has
+/// its own array of Stack objects, indexed by the current ply.
 
 struct Stack {
-  SplitPoint* splitPoint;
+  Move* pv;
+  PieceToHistory* continuationHistory;
   int ply;
   Move currentMove;
-  Move ttMove;
   Move excludedMove;
   Move killers[2];
-  Depth reduction;
   Value staticEval;
-  bool skipNullMove;
+  int statScore;
+  int moveCount;
 };
 
 
-/// RootMove struct is used for moves at the root of the tree. For each root
-/// move we store a score, a node count, and a PV (really a refutation in the
-/// case of moves which fail low). Score is normally set at -VALUE_INFINITE for
-/// all non-pv moves.
-struct RootMove {
+/// RootMove struct is used for moves at the root of the tree. For each root move
+/// we store a score and a PV (really a refutation in the case of moves which
+/// fail low). Score is normally set at -VALUE_INFINITE for all non-pv moves.
 
-  RootMove(Move m) : score(-VALUE_INFINITE), prevScore(-VALUE_INFINITE) {
-    pv.push_back(m); pv.push_back(MOVE_NONE);
-  }
+struct RootMove {
 
-  bool operator<(const RootMove& m) const { return score > m.score; } // Ascending sort
+  explicit RootMove(Move m) : pv(1, m) {}
+  bool extract_ponder_from_tt(Position& pos);
   bool operator==(const Move& m) const { return pv[0] == m; }
+  bool operator<(const RootMove& m) const { // Sort in descending order
+    return m.score != score ? m.score < score
+                            : m.previousScore < previousScore;
+  }
 
-  void extract_pv_from_tt(Position& pos);
-  void insert_pv_in_tt(Position& pos);
-
-  Value score;
-  Value prevScore;
+  Value score = -VALUE_INFINITE;
+  Value previousScore = -VALUE_INFINITE;
+  int selDepth = 0;
+  int tbRank = 0;
+  int bestMoveCount = 0;
+  Value tbScore;
   std::vector<Move> pv;
 };
 
+typedef std::vector<RootMove> RootMoves;
+
 
-/// The LimitsType struct stores information sent by GUI about available time
-/// to search the current move, maximum depth/time, if we are in analysis mode
-/// or if we have to ponder while it's our opponent's turn to move.
+/// LimitsType struct stores information sent by GUI about available time to
+/// search the current move, maximum depth/time, or if we are in analysis mode.
 
 struct LimitsType {
 
-  LimitsType() { // Using memset on a std::vector is undefined behavior
-    nodes = time[WHITE] = time[BLACK] = inc[WHITE] = inc[BLACK] = movestogo =
-    depth = movetime = mate = infinite = ponder = 0;
+  LimitsType() { // Init explicitly due to broken value-initialization of non POD in MSVC
+    time[WHITE] = time[BLACK] = inc[WHITE] = inc[BLACK] = npmsec = movetime = TimePoint(0);
+    movestogo = depth = mate = perft = infinite = 0;
+    nodes = 0;
+  }
+
+  bool use_time_management() const {
+    return !(mate | movetime | depth | nodes | perft | infinite);
   }
-  bool use_time_management() const { return !(mate | movetime | depth | nodes | infinite); }
 
   std::vector<Move> searchmoves;
-  int time[COLOR_NB], inc[COLOR_NB], movestogo, depth, movetime, mate, infinite, ponder;
+  TimePoint time[COLOR_NB], inc[COLOR_NB], npmsec, movetime, startTime;
+  int movestogo, depth, mate, perft, infinite;
   int64_t nodes;
 };
 
-
-/// The SignalsType struct stores volatile flags updated during the search
-/// typically in an async fashion e.g. to stop the search by the GUI.
-
-struct SignalsType {
-  bool stop, stopOnPonderhit, firstRootMove, failedLowAtRoot;
-};
-
-typedef std::auto_ptr<std::stack<StateInfo> > StateStackPtr;
-
-extern volatile SignalsType Signals;
 extern LimitsType Limits;
-extern std::vector<RootMove> RootMoves;
-extern Position RootPos;
-extern Time::point SearchTime;
-extern StateStackPtr SetupStates;
-
-extern void init();
-extern void think();
-template<bool Root> uint64_t perft(Position& pos, Depth depth);
+
+void init();
+void clear();
 
 } // namespace Search