[Retros] Two-pawns chess

[Nicolas Dupont]

> In 1-pawn capture chess, is 1. e4 d5 an illegal move?


If you assume it is a legal move, then "1-pawn capture chess" becomes  
more or less "No pawn can be captured except at the last half-move"  
(simply because the game is over when a pawn is captured).

I don't think this resulting condition is as interesting as claiming  
that 1.e4 d5 is illegal (auto-check). Moreover it may lead to some  
paradox: consider the position W: Ka1 Pa2, B: Ra8 Pb3. What about  
a2xb3? One might say this is illegal as in orthodox chess, but one  
might say this is legal as the game is over after a2xb3 (and thus  
black can't capture the white King at his next move).