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

[Seth Breidbart]

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.

Seth