[Retros] At Home SPGs, and more

[François Perruchaud]

An example at ply 13 : 
rnbq1bnr/ppppp3/6p1/7k/5QPp/4P3/PPPP1P1P/RNB1K1NR
Mat - SPG in 6.5

-----Message d'origine-----
De : retros-admin@janko.at [mailto:retros-admin@janko.at] De la part de
Francois Labelle
Objet : [Retros] At Home SPGs, and more

There's a funny problem I runned into: "checkmate" is a property of
position, not diagram. Is it possible to come up with a diagram which is
either checkmate or not checkmate depending on whether some specific en
passant capture is possible or not? Now imagine that the checkmate is
uniquely realizable, but the diagram is not! I don't think it happened in
my search, but theoretically the diagrams that I'm counting may require
the text "checkmate".