X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fsearch.cpp;h=94c03619a39e8c818739316096f1acfc87b08574;hb=84451191f3e16be2d532353b4df3d870b84b4f5d;hp=8b45130a4319b71e16c4815802d6d9ede427e5fa;hpb=2ed3358fafdd7189637b9db4d20d7fb725b7a122;p=stockfish

diff --git a/src/search.cpp b/src/search.cpp
index 8b45130a..94c03619 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1379,13 +1379,18 @@ namespace {
             if (nullValue >= value_mate_in(PLY_MAX))
                 nullValue = beta;
 
-            if (depth < 6 * OnePly)
-                return nullValue;
+            // Do zugzwang verification search for high depths, don't store in TT
+            // if search was stopped.
+            if (   (   depth < 6 * OnePly
+                    || search(pos, ss, beta, depth-5*OnePly, ply, false, threadID) >= beta)
+                && !AbortSearch
+                && !TM.thread_should_stop(threadID))
+            {
+                assert(value_to_tt(nullValue, ply) == nullValue);
 
-            // Do zugzwang verification search
-            Value v = search(pos, ss, beta, depth-5*OnePly, ply, false, threadID);
-            if (v >= beta)
+                TT.store(posKey, nullValue, VALUE_TYPE_LOWER, depth, MOVE_NONE);
                 return nullValue;
+            }
         } else {
             // The null move failed low, which means that we may be faced with
             // some kind of threat. If the previous move was reduced, check if