[r-t] Doubles Principles

[H C Pumphrey]

H C Pumphrey wrote:
> Samuel M. Austin wrote:
> 
>> Is it possible to have a Doubles Principle consisting of 10 or 20 
>> changes per section?
> I have not tried 10 or 20 changes / section, but I have tried 6, 8 and 12.

OK, so I just tried 10 changes. Lots of possibilities emerge of which
3-1-5-1-3-1-5-1-3-1- is just one. And as it is pure doubles you can 
immediately obtain a 100 with two singles. But I suspect that the remaining 20 
changes are a bit inaccessible.

Hugh

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