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DMP 51 -- Cover which point?

Posted By: Nack Ballard
Date: Thursday, 3 March 2016, at 5:41 a.m.

In Response To: DMP 51 -- Cover which point? (Colin Owen)





White is Player 2

score: 0
pip: 242
1 point match
pip: 150
score: 0

Blue is Player 1
XGID=-bbbb-EACAAAcA-----caA---A:0:0:1:51:0:0:0:1:10

Problem 1:... Blue to play 51


Bob asked at what settings I would trust XG's rollout. It's a fair question. In part, it depends on by how big a margin the top play dominates. Typically, I start at 3-ply, then roll out the candidates that are close (and look like the kind of plays that might overturn) on 4-ply, and so on (assuming I'm willing to invest the time -- else leave it to anyone interested enough). I have no set formula.

Keene and Colin inquired about the retro-ability of the positions. Admittedly, the Problem 2 position looks difficult to arrive at with reasonable play (though I haven't tried).

However, I'm sure the Problem 1 position (shown above) can be achieved with perfect play. For example, though without bothering to retrofit from the beginning, I'll trust the reader can accept that a position such as the one diagrammed below is reachable.






White is Player 2

score: 0
pip: 243
1 point match
pip: 137
score: 0

Blue is Player 1
XGID=abbb--EaD-B-cC--A--ca-----:0:0:-1:66:0:0:0:1:10

White fans


From here (starting with White fanning), the sequence F-54$-63R-64K-4-64H-22@-51 is perfectly played at DMP according to XGR++ and reaches the Problem 1 position diagrammed at the top of this message.

Nack

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