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CRB backgame series #14

Posted By: Taper_Mike
Date: Friday, 11 May 2012, at 7:18 p.m.

In Response To: CRB backgame series #14 (Chuck Bower)

–
White is Player 2

score: 3
pip: 214
7 point match
pip: 158
score: 3

Blue is Player 1
XGID=-aBaB-B-a---cA---c-bdCCA-A:1:1:-1:66:3:3:0:7:10
Blue to play 66

Thanks, Chuck, for presenting this interesting and difficult series of backgame positions.

My goal in #14 is to make an outside prime, so I start by making the bar point. After that, the 9pt is my next target.

I can diminish the odds that White makes a third anchor, and perhaps gain some timing, by making the dump play, 8/2*. If I am going to be successful in building an outside block, I am going to need to recirculate some of the spares on the 5pt and 8pt. The dump play begins the process.

Finally, I move one of my blots within range of my 9pt target.

o (outer) = 17/11, 13/7(2), 8/2*

I don’t really like hitting on White’s midpoint. It is my second choice.

A Note about Nactation
For a roll of doublets, the underlined families denoted by one of the letters in the word OCEAN, contain plays that move checkers the ratio 1:3 or 3:1. Specifically, plays in the underlined O (Outer) family move checkers in the ratios Far:Down:Jump:Inside = 0:1:3:0 or 0:3:1:0.

Between the play above and 17/11 8/2(3), which should get the upper case O? To answer, apply the Hit Convention. It states that making a new point in the inner board trumps any hit. Therefore, 17/11 8/2(3), which makes the 2pt, gets the capital O.

Mike

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