From 8454d871ec105749fb5e2e7e9aea9e7c25cfdf6e Mon Sep 17 00:00:00 2001
From: "H. Felix Wittmann" <hfwittmann@gmail.com>
Date: Thu, 2 Jan 2014 13:00:48 +0100
Subject: [PATCH 1/1] Ensure move_importance() is non-zero

In case ply is very high, function will round
to zero (although mathematically it is always
bigger than zero). On my system this happens at
movenumber 6661.

Although 6661 moves in a game is, of course,
probably impossible, for safety and to be locally
consistent makes sense to ensure returned value
is positive.

Non functional change.
---
 src/timeman.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/timeman.cpp b/src/timeman.cpp
index 9accfbb3..0348b677 100644
--- a/src/timeman.cpp
+++ b/src/timeman.cpp
@@ -18,6 +18,7 @@
 */
 
 #include <algorithm>
+#include <cfloat>
 #include <cmath>
 
 #include "search.h"
@@ -44,7 +45,7 @@ namespace {
 
   double move_importance(int ply) {
 
-    return pow((1 + exp((ply - xshift) / xscale)), -skewfactor);
+    return pow((1 + exp((ply - xshift) / xscale)), -skewfactor) + DBL_MIN; // Ensure non-zero
   }
 
 
-- 
2.39.2