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31P-61P-31 and 31P-53P-31

Posted By: Nack Ballard
Date: Monday, 28 March 2011, at 2:34 p.m.

In Response To: 31P-53P-31 Rollout (neilkaz)

This is a response to Neil's rollout post.

31P-61P-31

31P-53P-31

Below are (money) rollout results of these two contrasting positions. (Thanks, Neil for the XG rollout.)

31P-61P-31
[E S23 N41] /5
[E S22 N26] /5

31P-53P-31
[N E12 S12] ~12
[N E7 S12 U31] /10**5
[N E9 S17] "<7=

Key: E = Each (24/21 6/5), S = Split (24/23 13/10), N = Near (13/10 6/5). Margins are in thousandths. After the bracket is a bot symbol (~ Snowie, / GnuBG, "<...= XG2 3-ply checkers and Roller cube) followed by the number of trials in thousands, rounded down (an asterisk repeats a number).

For example, "[N E9 S17] ~12" means that N is best, E is -.012 and S is -.012 in a Snowie rollout of 12000+ trials.

In short, E is best on the left, and N is best on the right (except at gammon save where E is best).

You can read the full analysis of both positions in Backgammon Openings, pp. 68–69.

Nack

Messages In This Thread

• Learning 3rd roll plays and principles 31P-53P-31?
  neilkaz -- Saturday, 26 March 2011, at 6:56 p.m.
  • Learning 3rd roll plays and principles 31P-53P-31?
    christian munk-christensen -- Saturday, 26 March 2011, at 7:51 p.m.
    • Learning 3rd roll plays and principles 31P-53P-31?
      Fender -- Saturday, 26 March 2011, at 7:58 p.m.
      • Learning 3rd roll plays and principles 31P-53P-31?
        Nack Ballard -- Saturday, 26 March 2011, at 9:03 p.m.
      • Learning 3rd roll plays and principles 31P-53P-31?
        svilo -- Saturday, 26 March 2011, at 9:14 p.m.
        • Learning 3rd roll plays and principles 31P-53P-31?
          Nack Ballard -- Saturday, 26 March 2011, at 11:13 p.m.
          • Learning 3rd roll plays and principles 31P-53P-31?
            Fender -- Sunday, 27 March 2011, at 8:00 a.m.
          • Learning 3rd roll plays and principles 31P-53P-31?
            svilo -- Sunday, 27 March 2011, at 11:04 a.m.
  • Learning 3rd roll plays and principles 31P-53P-31?
    Stein Kulseth -- Sunday, 27 March 2011, at 1:08 a.m.
  • 31P-53P-31 Rollout
    neilkaz -- Monday, 28 March 2011, at 9:22 a.m.
    • 31P-61P-31 and 31P-53P-31
      Nack Ballard -- Monday, 28 March 2011, at 2:34 p.m.
      • 31P-61P-31 and 31P-53P-31 — Typo?
        Taper_Mike -- Friday, 13 January 2012, at 6:32 p.m.
        • 31P-61P-31 and 31P-53P-31 — Typo?
          Nack Ballard -- Friday, 13 January 2012, at 10:23 p.m.