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);
{
assert(value_to_tt(nullValue, ply) == nullValue);
- // Special flag null values that are not zugzwang checked
- ValueType vt = (depth < 6 * OnePly ? VALUE_TYPE_NS_LO : VALUE_TYPE_LOWER);
- TT.store(posKey, nullValue, vt, depth, MOVE_NONE);
+ TT.store(posKey, nullValue, VALUE_TYPE_NS_LO, depth, MOVE_NONE);
return nullValue;
}
} else {
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)