X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fsearch.cpp;h=aa27ec2b02eec827a5bb7b5b7092d2043044d041;hb=9ca014df497de8b3fa4a1da75e8af8a567141a90;hp=af7a5c13dd643f411e8bf1f94906e8269423f714;hpb=53c07c34bb0aba765e1add91bbc932dfce9bae52;p=stockfish

diff --git a/src/search.cpp b/src/search.cpp
index af7a5c13..aa27ec2b 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -82,7 +82,7 @@ namespace {
   // History and stats update bonus, based on depth
   int stat_bonus(Depth depth) {
     int d = depth / ONE_PLY;
-    return d > 17 ? 0 : 32 * d * d + 64 * d - 64;
+    return d > 17 ? 0 : 33 * d * d + 66 * d - 66;
   }
 
   // Skill structure is used to implement strength limit
@@ -935,7 +935,8 @@ moves_loop: // When in check, search starts from here
               int lmrDepth = std::max(newDepth - reduction<PvNode>(improving, depth, moveCount), DEPTH_ZERO) / ONE_PLY;
 
               // Countermoves based pruning (~20 Elo)
-              if (   lmrDepth < 3
+              if (   lmrDepth < 4
+                  && (lmrDepth < 3 || ((ss - 1)->statScore > 0 && !PvNode))
                   && (*contHist[0])[movedPiece][to_sq(move)] < CounterMovePruneThreshold
                   && (*contHist[1])[movedPiece][to_sq(move)] < CounterMovePruneThreshold)
                   continue;