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21 to play

Posted By: joolesf
Date: Saturday, 24 December 2011, at 5:30 a.m.

In Response To: 21 to play (Snua)

Very nice problem !

OTB I would probably play 7/5* 13/12. It's thematic to hit off the front of the prime 7/5 and after that I couldn't see much difference between 5/4 and 13/12. However looking a bit deeper ...

The problem with these plays is they only seem to leave one number (34 or 35) that breaks the prime without hitting. If instead we make the five point (7/5* 6/5) things are a lot better, 23, 25, 34 and 35 are all bad. One way of looking at it is that he has good 6's since he can play 7/1* but no good 5's. If we make the five point his entering 5's are now added to his bad numbers.

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