diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 4c449774..7ca470af 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -73,8 +73,8 @@ Value Eval::evaluate(const Eval::NNUE::Networks&    networks,
         smallNet = false;
     }
 
-    // Blend optimism and eval with nnue complexity and material imbalance
-    optimism += optimism * (nnueComplexity + std::abs(simpleEval - nnue)) / 620;
+    // Blend optimism and eval with nnue complexity
+    optimism += optimism * nnueComplexity / 512;
     nnue -= nnue * (nnueComplexity * 5 / 3) / 32082;
 
     v = (nnue