Simplify move_importance(): take 3

[stockfish] / src / timeman.cpp

diff --git a/src/timeman.cpp b/src/timeman.cpp
index fc2a327df253528a77ce9f80f1b286728124f93d..5e9304d5c15a4385752a7ec48c96ad98283e415a 100644 (file)
--- a/src/timeman.cpp
+++ b/src/timeman.cpp
@@ -44,7 +44,7 @@ namespace {
 
   double move_importance(int ply) {
 
-    return 1 / pow((1 + exp((ply - xshift) / xscale)), skewfactor) + 1e-3; // Ensure non-zero
+    return pow((1 + exp((ply - xshift) / xscale)), -skewfactor);
   }