[Retros] About T.Orban problem; Yefim's letter 01/12/2005

Nicolas.Dupont at math.univ-lille1.fr Nicolas.Dupont at math.univ-lille1.fr
Tue Jan 11 22:12:36 EST 2005

>> Question : is it possible to go one step further ? that is several

>> solutions in N and N+1 moves, but only one solution in N+2 moves ?


> No. Start by popping a knight out and back; that turns any solution

> in N moves into 16 solutions in N+2 moves.


> Seth

Of course, I thought about that possibility. And it doesn't prove that the
answer to my question is obviously No. For example, let's consider a pg
where it is impossible to start by popping a knight.

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