X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=6cc115fcf94371304aaabe328414b160e39ece66;hp=3da3d04ea963e579b7d2c6154015eb7cc1a8ee19;hb=befbcffb4e4c5d2ebfb9504b059a337ae4a60ece;hpb=87586b3d0c8961c2fc9330e2f8ac2f8c3fe79018

diff --git a/src/search.cpp b/src/search.cpp
index 3da3d04e..6cc115fc 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1233,7 +1233,13 @@ moves_loop: // When in check, search starts from here
                   r++;
 
               // Decrease/increase reduction for moves with a good/bad history (~30 Elo)
-              r -= ss->statScore / 14884;
+              // If we are not in check use statScore, if we are in check
+              // use sum of main history and first continuation history with an offset
+              if (ss->inCheck)
+                  r -= (thisThread->mainHistory[us][from_to(move)]
+                     + (*contHist[0])[movedPiece][to_sq(move)] - 4333) / 16384;
+              else
+                  r -= ss->statScore / 14884;
           }
 
           Depth d = std::clamp(newDepth - r, 1, newDepth);