X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovepick.h;h=7d6651bb5da07c8c1bd87b9c6b26e7cb86384732;hp=9459b8c2a389e9e2aec27e830ba078931b845df7;hb=53051eefc741586f72ccbf9a765592c4ca6030bd;hpb=9f94d2280110a1ba5eb9eb15b0756883037a817d

diff --git a/src/movepick.h b/src/movepick.h
index 9459b8c2..7d6651bb 100644
--- a/src/movepick.h
+++ b/src/movepick.h
@@ -20,12 +20,36 @@
 #if !defined MOVEPICK_H_INCLUDED
 #define MOVEPICK_H_INCLUDED
 
-#include "history.h"
 #include "position.h"
 #include "search.h"
 #include "types.h"
 
 
+/// 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:
+
+  static const Value Max = Value(2000);
+
+  const Value* operator[](Piece p) const { return &history[p][0]; }
+  Value gain(Piece p, Square to) const { return gains[p][to]; }
+
+  void clear();
+  void update(Piece p, Square to, Value bonus);
+  void update_gain(Piece p, Square to, Value gain);
+
+private:
+  Value history[PIECE_NB][SQUARE_NB];
+  Value gains[PIECE_NB][SQUARE_NB];
+};
+
+
 /// MovePicker class is used to pick one pseudo legal move at a time from the
 /// current position. The most important method is next_move(), which returns a
 /// new pseudo legal move each time it is called, until there are no moves left,