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31P-32 AtS

Posted By: Nack Ballard
Date: Wednesday, 4 August 2010, at 9:50 p.m.

In Response To: 31P-32 at DMP is TCTC (David Rockwell)


2O ' ' '2X4X '2X ' ' '5O

2X ' ' ' '5O '3O ' ' '5X

31P-32 at DMP is TCTC


Thanks for the XG rollout, David. Gnu's shorter result agrees:

GnuBG .. d[S U0.4 Z1.3] 10k
XG 3-ply d[S Z1 U1] 46k

For reference, here are GnuBG's results at (gammon) save and go:

s[Z S5.4 U22] 15k 5kU
g[D Z4.9 S13] 5k

Bill asked about D. Snowie doesn't play checkers according to score, but as an indicator, at dmp D is -.022 (very close to David's guess), and, by the way, T is in fifth place at -.031.

As shown above, at gammon go, D is best, according to Gnu's short rollout. Eventually, all Gnu's close AtS results will be verified (or overturned) with XG data.

Key: S = Split (24/21 13/11), Z = reverse split (24/22 13/10), U = Up (24/22 24/21), D = Down (13/11 13/10), T = sTack/Tower (13/8). Error sizes are in thousandths.

Before the brackets, d = dmp, s = save, g = go; else assume money. Number of trials is in thousands (k), rounded down. For example, "s[Z S5.4 U22] 15k 5kU" means that at (gammon) save, Z is best and S is -.0054 after 15000+ trials, and U is -.022 after 5000+ trials.

Nack

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