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42P-41S-33 and 42P-21S-33 (Bot Info Included)

Posted By: Nack Ballard
Date: Thursday, 20 May 2010, at 5:44 a.m.

In Response To: Third roll double 3's (Timothy Chow)

I have a fair number of old rollouts for 42P-xxx-33 positions, though they're all truncated and some are a bit shorthanded on trials.

42P-41S-33 and 42P-21S-33 are an instructive pair, shown below.

Based on my truncs, in the left-hand position, C (Cross, 24/21(2) 8/5(2)) beats A (Attack, 8/5(2) 6/3(2) by .031. By contrast, in the right-hand position, A beats C by .041.


2O ' ' ' '5X '3X1X ' '5O

1X1X '2O '4O '2O ' ' '4X

42P-41S-33 [C A31]


2O ' ' ' '5X '3X ' '1X5O

1X1X '2O '4O '2O ' ' '4X

42P-21S-33 [A C41]


Threatening White's 9pt builder is of tremendous value. After Blue plays C in the left diagram, if White rolls 66 65 55 53 51 or 33, Blue will get a direct shot at the 16pt, and White's 54 52 31 (which would otherwise make her 4pt or 5pt) are substantially weakened.

Nack

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