[Retros] Min dual-free SPG where each survivor has moved.

Andrew Buchanan andrew at anselan.com
Wed May 1 22:16:22 EDT 2002

Noam Elkies originally asked for a dual-free SPG in which every unit moved.
Eric Angelini claimed an SPG in 14.0 in which every *surviving* unit moved.

Here is a dual-free SPG in 13.5 in which every *surviving* unit moved (proof
by Euclide 0.91). It is easy to see that the task cannot be satisfied in
fewer moves.

(9+8) SPG in 13.5.

Andrew Buchanan

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