Tweak reduction formula.

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index e5f286e459721321d63e67e437e3b96d8a5e9120..c7343ce8002ccd4aff7fcc41d8f9dce346efe6df 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -192,7 +192,7 @@ namespace {
 void Search::init() {
 
   for (int i = 1; i < MAX_MOVES; ++i)
-      Reductions[i] = int((22.0 + 2 * std::log(Threads.size())) * std::log(i));
+      Reductions[i] = int((22.0 + 2 * std::log(Threads.size())) * std::log(i + 0.25 * std::log(i)));
 }