Don't compensate TT for evaluation drift

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 39ed624c9ecc2408234b63c8518c843d3610fe77..ac4d85b69996eb7abadda3cf61fcd9d50ec39cf7 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1540,14 +1540,10 @@ namespace {
         // Use the cached evaluation score if possible
         assert(ei.futilityMargin == Value(0));
 
-        staticValue = tte->value();
+        staticValue = tte->value() + ply;
     }
     else
-    {
-        staticValue = evaluate(pos, ei, threadID);
-        if (!value_is_mate(staticValue + Value(ply)))
-            staticValue += Value(ply);
-    }
+        staticValue = evaluate(pos, ei, threadID) + ply;
 
     if (ply == PLY_MAX - 1)
         return evaluate(pos, ei, threadID);