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

[Bojan Basic]

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.