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Woolsey-Jones, Problem 80 — 3-ply XG2 Rollout

Posted By: Timothy Chow
Date: Saturday, 20 April 2013, at 1:53 a.m.

In Response To: Woolsey-Jones, Problem 80 — 3-ply XG2 Rollout (Taper_Mike)

Mike Taper wrote:

Someone who has more experience with Snowie than I do may be able to explain this better, but my understanding is that Snowie applies a formula to “correct” its unlimited game result according to the actual match score. This is known to distort some of the equities. Then, even though Tami’s original rollouts were made at score, for the book, all the problems were presented in unlimited games. The book’s Introduction does not make clear whether new rollouts were made for unlimited games.

I think it's unlikely that this explains the overturned verdicts. Snowie plays the checkers cubelessly. So it will do the same things during the rollout whether there's a match score or not. I don't think any of the cube/score adjustments that Snowie makes will ever reverse the order of two different checker plays (though this is the one point on which I'm not 100% certain). If this is correct, then it wouldn't matter whether the calculations were re-done; the same checker play would always come out on top.

It's more likely in my mind that Snowie and XG simply disagree.

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