Removed quadratic term in optimism

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index cc789e35d893cd2322b4699555df565288b27dfe..7239fd1eca04d8937d25021f447ece9edfdb316d 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -1072,7 +1072,7 @@ Value Eval::evaluate(const Position& pos) {
 
       // Blend nnue complexity with (semi)classical complexity
       nnueComplexity = (  397 * nnueComplexity
-                        + (477 + optimism) * abs(psq - nnue)
+                        + 477 * abs(psq - nnue)
                         ) / 1024;
 
       optimism += optimism * nnueComplexity / 256;