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XG 3-ply racks up a PR of 17.4

Posted By: Timothy Chow
Date: Thursday, 28 May 2015, at 11:28 p.m.

In a recent match that I played against XG2 3-ply, it executed the coup classique in Game 2. The XGR+ analysis charges it with a PR of 17.4. We shouldn't take this PR too literally of course since the XGR+ equity estimates are themselves somewhat suspect. In several cases, I had to manually force an XGR+ evaluation of what ended up being the first-choice play, because it was not making it through the move filter.

Anyway, although it's known that XG doesn't do too well in this type of containment position, I was still surprised at some of the plays. (Eschewing an obvious hit, for example.) These plays give us some sense of what could go wrong with 3-ply/XGR rollout settings for any position that has a sizable chance of leading to this kind of endgame.

I hope that HOMINID will pompously excommunicate me for my blasphemous suggestion that XG isn't perfect.

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