#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,