X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fhistory.h;h=b1121d85d54ea40f470762e6d2af7ca46990191d;hp=b08c8d33ce7034c3a0f9355e5fdaffc621ed9f2c;hb=439aea9ab79373f4520d157ef5feac6cff0ded56;hpb=5c81602d14539f8259a715477315e28b5de7cb54

diff --git a/src/history.h b/src/history.h
index b08c8d33..b1121d85 100644
--- a/src/history.h
+++ b/src/history.h
@@ -28,30 +28,34 @@
 #include "depth.h"
 #include "move.h"
 #include "piece.h"
+#include "value.h"
 
 
 ////
 //// Types
 ////
 
-/// The History class stores statistics about how often different moves have
-/// been successful or unsuccessful during the current search.  These
-/// statistics are used for reduction and move ordering decisions.
+/// The History class stores statistics about how often different moves
+/// have been successful or unsuccessful during the current search. These
+/// statistics are used for reduction and move ordering decisions. History
+/// entries are stored according only to moving piece and destination square,
+/// in particular two moves with different origin but same destination and
+/// same piece will be considered identical.
 
 class History {
 
 public:
   History();
   void clear();
-  void success(Piece p, Move m, Depth d);
-  void failure(Piece p, Move m);
-  int move_ordering_score(Piece p, Move m) const;
-  bool ok_to_prune(Piece p, Move m, Depth d) const;
+  void success(Piece p, Square to, Depth d);
+  void failure(Piece p, Square to, Depth d);
+  int move_ordering_score(Piece p, Square to) const;
+  void set_gain(Piece p, Square to, Value delta);
+  Value gain(Piece p, Square to) const;
 
 private:
   int history[16][64];  // [piece][square]
-  int successCount[16][64];
-  int failureCount[16][64];
+  int maxStaticValueDelta[16][64];  // [piece][from_square][to_square]
 };
 
 
@@ -61,17 +65,13 @@ private:
 
 /// HistoryMax controls how often the history counters will be scaled down:
 /// When the history score for a move gets bigger than HistoryMax, all
-/// entries in the table are divided by 2.  It is difficult to guess what
-/// the ideal value of this constant is.  Scaling down the scores often has
+/// entries in the table are divided by 2. It is difficult to guess what
+/// the ideal value of this constant is. Scaling down the scores often has
 /// the effect that parts of the search tree which have been searched
 /// recently have a bigger importance for move ordering than the moves which
 /// have been searched a long time ago.
-///
-/// Note that HistoryMax should probably be changed whenever the constant
-/// OnePly in depth.h is changed.  This is somewhat annoying.  Perhaps it
-/// would be better to scale down the history table at regular intervals?
 
-const int HistoryMax = 50000;
+const int HistoryMax = 50000 * OnePly;
 
 
 #endif // !defined(HISTORY_H_INCLUDED)