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Seven-point prime puzzle: Solution

Posted By: Nack Ballard
Date: Friday, 30 April 2010, at 12:04 a.m.

In Response To: Seven-point prime puzzle: Solution (Matt Cohn-Geier)

Yup, that's another good example of transposing the subplays according to the order of the rolls. Instead of 23/8 with three 5s and 8/5 with one 3, Blue can play 23/20 with one 3 and 20/5 with three 5s.

A simple example comes from the little puzzle of making a five-point prime in two rolls by the same player from the opening position. Most people, even if they've never seen it, find 22: 13/11(2) 6/4(2), 66: 13/7(2) 11/5(2) fairly quickly, but when you ask them if the order of rolls can be reversed their initial reaction is usually "no," and even when you tell them the answer is "yes" they often struggle with the solution.

Nack

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