en-passant is a rule allowing a pawn to make a special-case capture.

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What serious use of en-passant has been made recently?

I'm a (very) amateur player and have seen the use of en-passant only a couple of times in club games. Chess books I've read (Soltis, Weeramantry, Pandolfini,etc.) feature hardly any games having ...
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When and why was en passant invented?

Other than castling, the only "strange" move that chess pieces can ever make is en passant. It seems a little odd to me that someone thought that such a "different" move was so important to include ...