fail low history

bench 1488056
official-stockfish · Aug 17, 2024 · 677ec72 · 677ec72
1 parent ae9e55c
commit 677ec72
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/search.cpp b/src/search.cpp
@@ -1363,6 +1363,10 @@ Value Search::Worker::search(
               << stat_bonus(depth) * bonus / 25;
     }
 
+    // Bonus when search fails low and there is a TT move
+    else if (moveCount > 1 && ttData.move && (cutNode || PvNode))
+        thisThread->mainHistory[us][ttData.move.from_to()] << stat_bonus(depth) / 4;
+
     if (PvNode)
         bestValue = std::min(bestValue, maxValue);