Double HistoryMax and reduce aging

[stockfish] / src / history.h

diff --git a/src/history.h b/src/history.h
index 5c394cc8f17e2ed75f043ba01b0251e607127222..ddab6cd09f442b57e139d3e2e146c35711c75cc8 100644 (file)
--- a/src/history.h
+++ b/src/history.h
@@ -61,13 +61,13 @@ 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 4. It is difficult to guess what
+/// 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.
 
-const int HistoryMax = 25000 * OnePly;
+const int HistoryMax = 50000 * OnePly;
 
 
 #endif // !defined(HISTORY_H_INCLUDED)