LMR search tweak

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 37e3ff22b27ced0299542fe78b48540200d7b595..0a2519b62505087381d1396b6da30234c41edf6b 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1159,7 +1159,7 @@ moves_loop: // When in check, search starts from here
       // Step 16. Reduced depth search (LMR, ~200 Elo). If the move fails high it will be
       // re-searched at full depth.
       if (    depth >= 3
-          &&  moveCount > 1 + 2 * rootNode
+          &&  moveCount > 1 + 2 * rootNode + 2 * (PvNode && abs(bestValue) < 2)
           && (!rootNode || thisThread->best_move_count(move) == 0)
           && (  !captureOrPromotion
               || moveCountPruning