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[Bug-gnubg] Gnubg on MacOS High Sierra

From: Marcell Fulop
Subject: [Bug-gnubg] Gnubg on MacOS High Sierra
Date: Sun, 10 Dec 2017 18:49:17 +1100

I've had OS X version of Gnubg installed on El Capitan for a long time. This was the Gnubg.app which ran under XQuartz and, according to http://gnubg.org/index.php?itemid=22, it is based on version 1.04.000. 

As mentioned in an earlier thread (http://lists.gnu.org/archive/html/bug-gnubg/2017-12/msg00000.html) after upgrading to High Sierra, I was able to build 1.04.000 (w/o board3d and OpenGL support) so I started to play.

First I noticed it plays quite differently in _some_ situations form what I was used to. I played thousands of matches over years with with the OS X version. For instance, when it had very little but still some chance to win during bearoff, it started making stupid moves, e.g. moving a checker inside its home when it still had some outside. Previously, it used to play hard up until the last or next to last round when it gave up in such a situation.

Much more interestingly, I found significant differences in match analyses. I've saved hundreds of those thousands matches played previously along with analyses. Now, when I open such a match, then open the analysis (Analyse -> Match or session statistics), then I open the same match in another instance but here first I clear then analyse again (Analyse -> Clear analysis -> Match or session; Analyse -> Analyse match or session), the results are not even remotely similar.

Both versions are 1.04.000. The Player and Analysis settings used are always the predefined Grandmaster with no modifications. I probably didn't build this version under High Sierra "right" because of the stupid behaviour, and because these differences are consistently showing much lower ratings in case of the latter for the same match.

Any ideas? 

The build looked OK, it generated the two databases near the end as usual, etc. I can post some example .sgf files for verification and the full output of configure and make under High Sierra.

Marcel Fulop

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