X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fevaluate.h;h=c3b0b2b9e2bab40f15e739211270d2f359c2f79e;hb=c959871a59d106aa0294916890c31c475aa195ea;hp=eef888db5e2c1e4ea9cfaddb75e0beb5a4518697;hpb=9afa1d73306cb98e95acec5daf4efd65e592ceff;p=stockfish

diff --git a/src/evaluate.h b/src/evaluate.h
index eef888db..c3b0b2b9 100644
--- a/src/evaluate.h
+++ b/src/evaluate.h
@@ -21,6 +21,7 @@
 #ifndef EVALUATE_H_INCLUDED
 #define EVALUATE_H_INCLUDED
 
+#include <atomic>
 #include <string>
 
 #include "types.h"
@@ -29,9 +30,9 @@ class Position;
 
 namespace Eval {
 
-const Value Tempo = Value(20); // Must be visible to search
+constexpr Value Tempo = Value(20); // Must be visible to search
 
-extern Score Contempt;
+extern std::atomic<Score> Contempt;
 
 std::string trace(const Position& pos);