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NG Opening 41 -- Data

Posted By: Nack Ballard
Date: Thursday, 17 June 2010, at 5:16 a.m.

In Response To: NG Opening 41 (Nack Ballard)

Nackgammon (NG) Opening Position
How do you play opening 41?

Here is the rollout data for Nackgammon opening 41:

Money
Snowie .. [Q R10 T36] 10k 5kT
GnuBG .. [Q R7 T34 s68 S70 W81 V94] 62k 15kT 5k
XG 3-ply [Q R4 T36] 62k 15kT

Other scores (GnuBG)
d[R Q1 S21] 31k 20kS
s[Q R20] 20k
g[Q R8 S20 T23] 31k 15kS 20kT

Key: Q = Quadruple split (24/20 23/22), R = Run (23/18), T = sTack/Tower (13/8), s = alt split (24/23 13/9), S = Split, (23/22 13/9), W = Wild (24/20 6/5), V = Variant-Up (24/23 24/20).

Error sizes are in thousandths. A letter before the brackets denotes score: d = dmp, s = (gammon) save, g = (gammon) go; else assume money. After the brackets is the number of trials (in thousands, rounded down). For example, "d[R Q1 S21] 31k 20kS" means that at dmp, R is best and Q is -.001 after 31000+ trials (and S is -.021 after 20000+ trials).

Casper, Ian, Fabrice and Petter stated a money preference for Q (Quadruple split, 24/20 23/22), and this play does indeed top the rollouts, albeit by only a few thousandths.

David says, "I always play R here (Run 23-18)," but my guess is that he mostly plays 1-point (DMP) matches, and at that score R edges out Q, by .001 :)

Below are the positions after each of the best five money plays, with the (bot aggregate) error sizes encaptioned.

Blue played Q (best)

Blue played R (-.006, but bests Q by .001 at dmp)

Blue played T (-.035)

Blue played s (-.068)

Blue played S (-.070)

Nack

Messages In This Thread

• NG Opening 41
  Nack Ballard -- Thursday, 6 May 2010, at 8:13 p.m.
  • NG Opening 41
    Casper van der Tak -- Thursday, 6 May 2010, at 8:37 p.m.
  • NG Opening 41
    Ian Shaw -- Thursday, 6 May 2010, at 10:11 p.m.
  • NG Opening 41
    David Rockwell -- Thursday, 6 May 2010, at 11:06 p.m.
  • NG Opening 41
    Fabrice Liardet -- Friday, 7 May 2010, at 9:19 a.m.
  • NG Opening 41
    Petter Bengtsson -- Friday, 7 May 2010, at 4:45 p.m.
  • NG Opening 41 -- Data
    Nack Ballard -- Thursday, 17 June 2010, at 5:16 a.m.