On Thu, 21 Jan 2010 08:50:38 -0800, Darren New wrote:

> scott wrote:
>> Wow that's a good one.
> 
> That was fun, wasn't it? :-) It took me a while to come up with the
> "only way", and then another moment to figure out I needed the initial
> instructions of your first loop (cleverly avoiding spoilers), but once
> you see the answer, it all falls together in an "of course that's how
> you have to do it" sort of way.

What was along the way I was thinking as well, after initially realising 
I couldn't use variables (my first thought was to do an increasing number 
of L/R moves in each iteration, but without a variable to track how many 
times to loop, that doesn't work so well).

Jim

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