X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=727990dc9d354b753004ae37b61afd7f2c1d28ad;hp=cbc5038ab901889e3e875c901f07309481501349;hb=7e9f776fcafe0121c7449f4339b26d77c14adf50;hpb=3f1bc9e01301d617f530b05207c4067df92543f0

diff --git a/src/search.cpp b/src/search.cpp
index cbc5038a..727990dc 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -959,7 +959,10 @@ moves_loop: // When in check and at SpNode search starts from here
                                         [pos.piece_on(to_sq(move))][to_sq(move)] <= VALUE_ZERO))
               ss->reduction += ONE_PLY;
 
-          if (move == countermove)
+          if (    move == countermove
+              || (   History[pos.piece_on(to_sq(move))][to_sq(move)] > VALUE_ZERO
+                  && CounterMovesHistory[pos.piece_on(prevMoveSq)][prevMoveSq]
+                                        [pos.piece_on(to_sq(move))][to_sq(move)] > VALUE_ZERO))
               ss->reduction = std::max(DEPTH_ZERO, ss->reduction - ONE_PLY);
 
           // Decrease reduction for moves that escape a capture