X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=e6ffcb19f42cf73abcbb082f7a4789442ba36a06;hp=3f8436415358e04840d4f54736446ae82efa7874;hb=909e3adede210a124ed9ec4a2f21d73fda61c26d;hpb=626b1f8c6adc6c6b1bd7dc30109cd7fa5f3c44d8

diff --git a/src/search.cpp b/src/search.cpp
index 3f843641..e6ffcb19 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1388,7 +1388,9 @@ namespace {
             {
                 assert(value_to_tt(nullValue, ply) == nullValue);
 
-                TT.store(posKey, nullValue, VALUE_TYPE_NS_LO, depth, MOVE_NONE);
+                // Special flag null values that are not zugzwang checked
+                ValueType vt = (depth < 6 * OnePly ? VALUE_TYPE_NS_LO : VALUE_TYPE_LOWER);
+                TT.store(posKey, nullValue, vt, depth, MOVE_NONE);
                 return nullValue;
             }
         } else {