X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;ds=sidebyside;f=src%2Fsearch.cpp;h=de343144b4c02efac3fe56c482c6f3bb244c7fea;hb=15eb59683ed00a4b1fba9eec609f0e1ce2442b79;hp=c8c8d4bda672a45fba916c8ad48168e9c3bcba30;hpb=2a203d8d6fb067461db55bcf3ade747dca9492b7;p=stockfish

diff --git a/src/search.cpp b/src/search.cpp
index c8c8d4bd..de343144 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1080,7 +1080,7 @@ namespace {
       {
         // Try to reduce non-pv search depth by one ply if move seems not problematic,
         // if the move fails high will be re-searched at full depth.
-        if (    depth >= 2*OnePly
+        if (    depth >= 3*OnePly
             &&  moveCount >= LMRPVMoves
             && !dangerous
             && !moveIsCapture
@@ -1243,8 +1243,9 @@ namespace {
 
         StateInfo st;
         pos.do_null_move(st);
+        int R = (depth >= 5 * OnePly ? 4 : 3); // Null move dynamic reduction
 
-        Value nullValue = -search(pos, ss, -(beta-1), depth-4*OnePly, ply+1, false, threadID);
+        Value nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID);
 
         pos.undo_null_move();