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21S-64, 42Z-53, 63Z-42, and 41W-31

Posted By: Nack Ballard
Date: Wednesday, 16 June 2010, at 2:42 a.m.

In Response To: 21S-64, 42Z-53, 63Z-42, and 41W-31 (Timothy Chow)

I would play run, run, point, point respectively. The second one (53 to play) is the one I'm least confident about. Very confident about the first and fourth, pretty confident about the third.

There wasn't much interest shown in this set of four positions, so I'll just follow up briefly and won't bother with diagrams.

You are right about everything. When the inside blot is on the 4pt or 5pt, it should be pointed on. For 63Z-42, R is a whopper. For 41W-31, R is a whopper with cheese.

When the inside blot is on the 3pt or 2pt, one should hit outside. For 42Z-53, the closest decision, hitting outside is right by .04 -- that is, P is merely a mistake. For 21S-64, P is a whopper.

If one's back checkers are split (instead of being still anchored on the 24pt), however, such as with 41S-32Z-53 or 21S-32Z-53, it's generally better to play P (Point, 8/3 6/3*).

Nack

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