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

[Nicolas.Dupont at math.univ-lille1.fr]

> As you point out, the reflected version of the problem also works, but I

> hope you are not suggesting that it is therefore the preferable form.


Of course not. I just wanted to make clear that such a paradox is not
relevant to  castling rights.

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 ?


>> It should be noticed that the following "mirror problem" shows the same

>> paradox without any question about the right of castling.

>>

>>

>> tcfdrfct/ppp3pp/3p1p2/8/3P4/8/PPP1PPPP/TC1DRFCT

>>

>> a) spg in 3 moves, 4 solutions

>>

>> b) (exact) pg in 4 moves

>>

>> cheers,

>>

>> Nicolas.