Fix early stop condition

[stockfish] / src / timeman.cpp

diff --git a/src/timeman.cpp b/src/timeman.cpp
index 5e9304d5c15a4385752a7ec48c96ad98283e415a..9f131d46d512d0ba6e4494ec81db724bd7698524 100644 (file)
--- a/src/timeman.cpp
+++ b/src/timeman.cpp
@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2013 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2014 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -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
   }
 
 
@@ -65,7 +66,7 @@ void TimeManager::pv_instability(double bestMoveChanges) {
 
 void TimeManager::init(const Search::LimitsType& limits, int currentPly, Color us)
 {
-  /* We support four different kind of time controls:
+  /* We support four different kinds of time controls:
 
       increment == 0 && movesToGo == 0 means: x basetime  [sudden death!]
       increment == 0 && movesToGo != 0 means: x moves in y minutes