Increase reductions with thread count

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 48694cb2dedebcebaec8dd59491ade87c41d2daf..3eb8e9e1ee867e0595b6b2a247fe13db633575c5 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -173,7 +173,7 @@ namespace {
 void Search::init() {
 
   for (int i = 1; i < MAX_MOVES; ++i)
-      Reductions[i] = int(21.9 * std::log(i));
+      Reductions[i] = int((21.9 + std::log(Threads.size()) / 2) * std::log(i));
 }