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31 opening roll

Posted By: Nack Ballard
Date: Thursday, 5 January 2012, at 4:39 p.m.

In Response To: 31 opening roll (Ray Kershaw)

Using XG 2.01, XG Roller++, Unlimited, Max cube value 1,024, I notice these equities after an opening 31:

Jacoby 0.254 No Jacoby 0.234

I expected Jacoby would have been lower. Can someone explain why I am wrong ? Is it that the Jacoby Rule forces you to double quicker than would be ideal with No Jacoby ?

No, I can't. Like you, I would think that having the option to play for the gammon on the 1 level would help you slightly more than than it does your opponent. I would expect the ranking of equities to be reversed (and the difference to be less than .020).

Either the XGR++ evaluator is imperfect (or buggy) or we're overlooking a concept.

Nack

Messages In This Thread

• 31 opening roll
  Ray Kershaw -- Thursday, 5 January 2012, at 12:07 p.m.
  • 31 opening roll
    Nack Ballard -- Thursday, 5 January 2012, at 4:39 p.m.
    • 31 opening roll
      Nack Ballard -- Thursday, 5 January 2012, at 4:47 p.m.
      • 31 opening roll
        Ian Shaw -- Thursday, 5 January 2012, at 8:10 p.m.
      • 31 opening roll
        Ray Kershaw -- Friday, 6 January 2012, at 9:33 a.m.
        • 31 opening roll
          Stick -- Friday, 6 January 2012, at 9:30 p.m.
        • 31 opening roll
          Ray Kershaw -- Friday, 6 January 2012, at 9:44 p.m.
        • 31 opening roll
          Timothy Chow -- Saturday, 7 January 2012, at 12:45 a.m.