[Retros] Re: About T.Orban problem; Yefim's letter

Bojan Basic bbasic at ptt.yu
Thu Jan 13 00:02:40 EST 2005

Nicolas.Dupont at math.univ-lille1.fr wrote:


> > 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.

This is certainly possible using some fairy conditions, but I
unfortunately know no example.

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