Black just played f5 and I tried to en passant, but it would not let me. Is this illegal? Or am I missing something?
En Passant Into Check Illegal?
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It should be on e5 and after playing f5 you could play exf6.
https://en.wikipedia.org/wiki/En_passant
I will refrain myself from asserting my superiority in an attempt to feed my ego by making mean jokes about how you do not know how en-passant works.
Have a nice day sir.