[r-t] Easter Challenge

Philip Earis pje24 at cantab.net
Mon Apr 13 20:19:07 UTC 2009

"I have attempted to find a set of rules for doubles that will give the 
extent in the plain course..."

I'm still not sure how this differs from what I said before. To phrase a 
related question, is it possible to generate an extent of doubles with just 
three changes (eg 1, 5 and 145?) If not, why not?

Doubles is really an interesting area. I'm tempted to write something for 
the RW.

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