Allow TT entries with key16==0 to be fetched

[stockfish] / src / types.h

diff --git a/src/types.h b/src/types.h
index 73da41e28f0e3e2385b8f2246c09d427b13b4621..1cd711b6f8566e8970e2fbbd34bbde310542ace9 100644 (file)
--- a/src/types.h
+++ b/src/types.h
@@ -232,7 +232,8 @@ enum : int {
   DEPTH_QS_RECAPTURES = -5,
 
   DEPTH_NONE   = -6,
-  DEPTH_OFFSET = DEPTH_NONE
+
+  DEPTH_OFFSET = -7 // value used only for TT entry occupancy check
 };
 
 enum Square : int {