int SearchStartTime, MaxNodes, MaxDepth, MaxSearchTime;
int AbsoluteMaxSearchTime, ExtraSearchTime, ExactMaxTime;
bool UseTimeManagement, InfiniteSearch, PonderSearch, StopOnPonderhit;
- bool FirstRootMove, AbortSearch, Quit, AspirationFailLow;
+ bool FirstRootMove, AbortSearch, Quit, AspirationFailLow, ZugDetection;
// Log file
bool UseLogFile;
MultiPV = get_option_value_int("MultiPV");
Chess960 = get_option_value_bool("UCI_Chess960");
UseLogFile = get_option_value_bool("Use Search Log");
+ ZugDetection = get_option_value_bool("Zugzwang detection"); // To be removed after 1.7.1
if (UseLogFile)
LogFile.open(get_option_value_string("Search Log Filename").c_str(), std::ios::out | std::ios::app);
Value v = value_from_tt(tte->value(), ply);
- return (allowNullmove || !(tte->type() & VALUE_TYPE_NULL))
+ return (allowNullmove || !(tte->type() & VALUE_TYPE_NULL) || !ZugDetection)
&& ( tte->depth() >= depth
|| v >= Max(value_mate_in(PLY_MAX), beta)
o["UCI_Chess960"] = Option(false);
o["UCI_AnalyseMode"] = Option(false);
+ // Temporary hack for 1.7.1 to be removed in next release
+ o["Zugzwang detection"] = Option(false);
+
// Any option should know its name so to be easily printed
for (Options::iterator it = o.begin(); it != o.end(); ++it)
it->second.name = it->first;