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*Rollout* - 54 to play at DMP

Posted By: Timothy Chow
Date: Sunday, 30 August 2015, at 5:17 p.m.

In Response To: *Rollout* - 54 to play at DMP (Chase)

Great position! No way would I have played 14/9 11/7* OTB. Also, welcome back to BGO!

As Stick said, 3-ply/XGR is fine for almost anything. The main exceptions that come to mind are:

1. When you suspect an immediate misplay by 3-ply/XGR. For example, if the opponent may have an immediate double then XG has a "rollout for both double and no double" setting that is useful. Otherwise, you may have to tinker with the settings to try to eliminate the misplay somehow. Here is a good example courtesy of Michael Depreli.

2. Positions that 3-ply/XGR generally doesn't understand very well. For example, Igor recommends XGR+/XGR+ for backgames. Another weakness of XG is containment. Not long ago I posted a game in which XG 3-ply racked up a PR of 17.4. (Of course now the question arises as to whether any rollout settings can be trusted for such positions.) Finally, and perhaps surprisingly, XG is a donkey when it comes to noncontact bearin play.

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