Advanced pawn pushes tweak (#2175)

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index a3ce4c2d3a49c2a257dc9a74a35e5e3f3a2aa7bf..115867873748a0f6a958a84f2945fe8020cc5496 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -958,7 +958,7 @@ moves_loop: // When in check, search starts from here
 
           if (   !captureOrPromotion
               && !givesCheck
-              && !pos.advanced_pawn_push(move))
+              && (!pos.advanced_pawn_push(move) || pos.non_pawn_material(~us) > BishopValueMg))
           {
               // Move count based pruning (~30 Elo)
               if (moveCountPruning)