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Backgammon Problems by
Mike Corbett |
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These days an
enormous amount of quality backgammon analysis is available for
free or for a very modest subscription on the internet. My
favourite sites are
GammonU with Kit Woolsey’s
commentary on the matches which he has been playing for many years
against his readers; Stick Rice’s
bgonline with its lively
discussion board; and
Gammon Village with well
researched articles by top players including Steve Sax, the late
Walter Trice and Douglas Zare. o Settings: number of games; played (for example) 3-ply (precise), cube 3-ply; settlement (for example) at 0.550 at 4pts; seed 1 without race database (for example). Sometimes Corbett gives all these settings, sometimes just some of them and sometimes none at all. The absence of a full specification of all the settings makes it impossible for anyone to replicate Corbett’s output. (Indeed, Corbett does not even say which version(s) of Snowie he has used.) o 95% confidence interval: Again sometimes he gives this and sometimes he does not. He does not seem to have actually used the confidence intervals to establish whether a rollout has yielded a statistically significant difference between two plays. It seems clear to me that there is often no such significant difference.
When and why a Snowie
rollout contradicts its evaluation is an admittedly very difficult
topic, presumably being addressed by current bot developers.
Corbett has identified a few biases in Snowie’s evaluations and
his findings may be of interest to enthusiastic students of
backgammon bots. But the general student of backgammon is advised
to buy the other books cited above before spending £30 on
Backgammon Problems. |
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Many thanx to Ray Kershaw for this review - published 2nd October 2009 |
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