along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-
#if !defined(HISTORY_H_INCLUDED)
#define HISTORY_H_INCLUDED
-////
-//// Includes
-////
-
#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. History
int maxStaticValueDelta[16][64]; // [piece][from_square][to_square]
};
-
-////
-//// Constants and variables
-////
-
-/// 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
-/// 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.
-/// Current policy is to set this as high as possible, but avoid overflow.
-
-const int HistoryMax = (1 << 28);
-
-
-////
-//// Inline functions
-////
-
inline int History::value(Piece p, Square to) const {
return history[p][to];
}