Alternative formula for dynamic contempt

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 15f870f5129c72916189a048d620825d3ace4c27..d7980bd7ab1d2ef23b7770e1344a7398a46d4c00 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -379,7 +379,7 @@ void Thread::search() {
               beta  = std::min(previousScore + delta, VALUE_INFINITE);
 
               // Adjust contempt based on root move's previousScore (dynamic contempt)
-              int dct = ct + int(std::round(48 * atan(float(previousScore) / 128)));
+              int dct = ct + 88 * previousScore / (abs(previousScore) + 200);
 
               contempt = (us == WHITE ?  make_score(dct, dct / 2)
                                       : -make_score(dct, dct / 2));