Use per-thread dynamic contempt

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 5f8db7414eb83c064e3679ea8570f40a144f0972..69c3278556ab856026f556b49ec9614680fd5a1e 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -28,8 +28,7 @@
 #include "evaluate.h"
 #include "material.h"
 #include "pawns.h"
-
-std::atomic<Score> Eval::Contempt;
+#include "thread.h"
 
 namespace Trace {
 
@@ -844,7 +843,7 @@ namespace {
     // Initialize score by reading the incrementally updated scores included in
     // the position object (material + piece square tables) and the material
     // imbalance. Score is computed internally from the white point of view.
-    Score score = pos.psq_score() + me->imbalance() + Eval::Contempt;
+    Score score = pos.psq_score() + me->imbalance() + pos.this_thread()->contempt;
 
     // Probe the pawn hash table
     pe = Pawns::probe(pos);
@@ -915,7 +914,7 @@ std::string Eval::trace(const Position& pos) {
 
   std::memset(scores, 0, sizeof(scores));
 
-  Eval::Contempt = SCORE_ZERO; // Reset any dynamic contempt
+  pos.this_thread()->contempt = SCORE_ZERO; // Reset any dynamic contempt
 
   Value v = Evaluation<TRACE>(pos).value();