[Retros] non-FEN fun

Noam Elkies elkies at math.harvard.edu
Mon Aug 19 18:02:07 EDT 2013

Joost de Heer <joost at sanguis.xs4all.nl> writes:

> I didn't know the a3 one, but it wasn't very hard to solve. Can it be

> altered to 'White's first move was with a knight, and he mates on the

> fifth move with his rook. Game?'?

Alas no. I hoped that something like this would work because 1 a3
is a bigger hint than 1 e4 in the 5...NxR# puzzle. But there are cooks:
1 Nc3 d6 2 a4 Kd7 3 a5 Kc6 4 Ra4 Q(B)d7 5 Rc4#. Pity about the alternative
in Black's last move, because each of the sequences is unique given that
White begins with a Knight.


More information about the Retros mailing list