Or 1...e4.
Which of these obviously illegal moves would you play as black?
1. ...e4 or ...d4?
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funnily enough, i think this is quite interesting.
I think i'd go for e5 topping the kings knight , while trying to remove it with f3 is a bit awkward and d3 may lead to an exchange of queens endgame after say nf6 which i like the look of.
its really a question of which advance is more useful in theory, just an odd way of having it posed lol
this is interesting, I think I'd tend to go with the e pawn, maybe because I love playing advance french 
1... d4