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[stockfish] / src / movepick.h

diff --git a/src/movepick.h b/src/movepick.h
index 44fc51f6263d73ca5a88919ff044e3e6b256cc12..e64ebfade18308a55046c7b61e396e1800bb7f75 100644 (file)
--- a/src/movepick.h
+++ b/src/movepick.h
@@ -30,17 +30,16 @@
 
 
 /// The Stats struct stores moves statistics. According to the template parameter
-/// the class can store History, Gains and Countermoves. History records how often
+/// the class can store History and Countermoves. History records how often
 /// different moves have been successful or unsuccessful during the current search
-/// and is used for reduction and move ordering decisions. Gains records the move's
-/// best evaluation gain from one ply to the next and is used for pruning decisions.
+/// and is used for reduction and move ordering decisions.
 /// Countermoves store the move that refute a previous one. Entries are stored
 /// using only the moving piece and destination square, hence two moves with
 /// different origin but same destination and piece will be considered identical.
-template<bool Gain, typename T>
+template<typename T>
 struct Stats {
 
-  static const Value Max = Value(250);
+  static const Value Max = Value(1 << 28);
 
   const T* operator[](Piece pc) const { return table[pc]; }
   T* operator[](Piece pc) { return table[pc]; }
@@ -54,21 +53,17 @@ struct Stats {
 
   void update(Piece pc, Square to, Value v) {
 
-    if (Gain)
-        table[pc][to] = std::max(v, table[pc][to] - 1);
-
-    else if (abs(table[pc][to] + v) < Max)
-        table[pc][to] +=  v;
+    table[pc][to] -= table[pc][to] * std::min(abs(v), 512) / 512;
+    table[pc][to] += v * 64;
   }
 
 private:
   T table[PIECE_NB][SQUARE_NB];
 };
 
-typedef Stats< true, Value> GainsStats;
-typedef Stats<false, Value> HistoryStats;
-typedef Stats<false, Move> MovesStats;
-typedef Stats<false, HistoryStats> CounterMovesHistoryStats;
+typedef Stats<Value> HistoryStats;
+typedef Stats<Move> MovesStats;
+typedef Stats<HistoryStats> CounterMovesHistoryStats;
 
 
 /// MovePicker class is used to pick one pseudo legal move at a time from the
@@ -84,7 +79,7 @@ public:
   MovePicker& operator=(const MovePicker&) = delete;
 
   MovePicker(const Position&, Move, Depth, const HistoryStats&, const CounterMovesHistoryStats&, Square);
-  MovePicker(const Position&, Move, const HistoryStats&, const CounterMovesHistoryStats&, PieceType);
+  MovePicker(const Position&, Move, const HistoryStats&, const CounterMovesHistoryStats&, Value);
   MovePicker(const Position&, Move, Depth, const HistoryStats&, const CounterMovesHistoryStats&, Move, Search::Stack*);
 
   template<bool SpNode> Move next_move();
@@ -104,9 +99,9 @@ private:
   Move ttMove;
   ExtMove killers[3];
   Square recaptureSquare;
-  Value captureThreshold;
+  Value threshold;
   int stage;
-  ExtMove *endQuiets, *endBadCaptures;
+  ExtMove *endQuiets, *endBadCaptures = moves + MAX_MOVES - 1;
   ExtMove moves[MAX_MOVES], *cur = moves, *endMoves = moves;
 };