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54S-21H-31 -- warning, bot content

Posted By: Nack Ballard
Date: Friday, 18 June 2010, at 3:35 a.m.

In Response To: 3rd roll decison (Chuck Bower)


1O ' ' '1X4X '3X ' '1X4O

2X ' ' ' '5O '4O ' ' '4X

54S-21H-31


Paul and I did not do a full rollout of this position for the Backgammon Openings book. Even if one of the top two plays had emerged as clearly best, we could find no closely enough related third roll 31 position that would (conversely) make the other play clearly better. 54S-21H-31 could still be educational by itself, but with few exceptions we saved our CPU time (limited even with many rollout volunteers helping us) to strive for instructive contrasting pairs.

Our trunc for 54S-21H-31 is

[U V4 $33 D35 737] 2t

...where U = Up (Bar/21), V = Variant-up (Bar/22 24/23), $ = Bar/22 6/5, D = Bar/24 13/10, and 7 = 7pt (Bar/22 8/7).

Error sizes are in thousandths. U is best, V is -.004, $ is -.033, etc. "2t" refers to a 2000+ trial truncated rollout.

In short, in the featured position there seems to be little difference in equity between the coming-up plays of U and V.

Head Nactato

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