Clamp HH bonus

Bench: 12497427
SzilBalazs · Aug 28, 2023 · e4d82fd · e4d82fd
1 parent f041255
commit e4d82fd
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/search/history.h b/src/search/history.h
@@ -77,6 +77,7 @@ namespace search {
         }
 
         void update_butterfly_history(chess::Move move, int bonus) {
+            bonus = std::clamp(bonus, -1000, 1000);
             int scaled = bonus - butterfly[move.get_from()][move.get_to()] * std::abs(bonus) / 32768;
             butterfly[move.get_from()][move.get_to()] += scaled;
         }