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XG question: Double point at -2,-2

Posted By: Nack Ballard
Date: Monday, 5 July 2010, at 7:20 p.m.

In Response To: XG question: Double point at -2,-2 (Bob Koca)

Thanks, Bob, for alerting me to this "puzzle" by e-mail. I had indeed bypassed the thread. This is not really my type of puzzle, mainly because rollout power (which I'm short on) is likely to be needed as part of the proof; moreover, I'm clumsy with Gnu and don't yet have XG.

Below is a position that qualifies by quick Snowie evals. It will probably fall flat on other bot evals or in rollouts (with R/K as arbiter), but I suspect it's just a matter of tweaking the position so that it threads the Rockwell/Kaz needle instead of the Snowie-MET needle.

Score: -2-2111


' ' '2X2O3X3X3X2X '2X '

' ' '2O3O3O3O1O1O ' ' '

Blue on roll: cube action?119


Snowie evals:

    ND -0.791 (Correct action = ND)
    DT -0.803

If Blue rolls 21 (worst), plays 7/6 5/3, now White on roll:

    DT 0.992 (Correct action = DT)

If Blue 55, White 21 (best/worst), Blue back on roll:

    DP 1.530 (Correct action = DP)

Reviewing your conditions:

    1) There is no sequence that makes X too good to double 2) X has a market losing sequence 3) X has no roll so that opponent has immediately lost his market. 4) The double is optional.

The position qualifies for 1, 2 and 3, and I'll (tentatively) assume the position doesn't go against your intentions for 4: that is, no double is at least as difficult to attain as optional double.

Nack

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