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Introduce "Zugzwang detection" temporary hack for 1.7.1

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Add an UCI option "Zugzwang detection" OFF by default that
enables correct detection of zugzwang.

This is just to let 1.7.1 be 100% compatible with 1.7 and
should be removed after release.

Verified 100% functional equivalent to 1.7

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-04-10 16:40:03 +01:00
parent d720778b2b
commit f9d3b48ad0
2 changed files with 6 additions and 2 deletions
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5
src/search.cpp
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@ -257,7 +257,7 @@ namespace {
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;
@ -425,6 +425,7 @@ bool think(const Position& pos, bool infinite, bool ponder, int side_to_move,
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);
@ -2315,7 +2316,7 @@ namespace {
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)

3
src/ucioption.cpp
View file

@ -113,6 +113,9 @@ namespace {
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;