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OLM Tu 03/27/12

Posted By: Taper_Mike
Date: Wednesday, 28 March 2012, at 3:53 a.m.

In Response To: OLM Tu 03/27/12 (Jason Lee)





White is XG Roller++

score: 7
pip: 103
15 point match
pip: 102
score: 9

Blue is BGO Readers
XGID=--BbDBC-----aBB----cbbbab-:0:0:1:00:9:7:0:15:10
Blue on roll, cube action?

Future variations include:

  • Hit/dance = (20/36) * (16/36) = 25%
  • Hit/enter = (20/36) * (20/36) = 31%
  • We roll big doublets (55, 66), while our opponent doesn’t = (2/36) * (34/36) = 5%
  • We leave a blot after rolling 54, 63, 64 or 65 = (8/36) = 22%

How many of these are market losers? A hit and dance lose the market by a mile. Most often, we are too good after such a sequence. Rolling an unanswered set of big doublets will also lose our market. I am less certain about the sequences where White enters after a hit. Often he will have a take.

Neither side seems likely to lose a gammon. With the 3pt anchor, White might lose a gammon 2-3% of the time, a little higher when we hit a third checker. After Blue is hit, he may not move again, so Blue’s gammon-loss rate might be on the order of 4-5% (guestimate!).

Sometimes, we roll badly: 54, 63, 64 and 65 all leave a single shot outside. But White will only hit 13 or 14 times in 36, so our chance of being hit in the next two turns is at most (8/36) * (14/36) = 9%.

At this match score, with low gammon possibilities for either side, and a fair number of market losers, I say we double.

Double

Mike

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