Pawn movement (& capture?) variant

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GrandPatzerDave-taken

During the chess.com WCC commentary with Danny, Fabiano, and Robert there was a passing discussion about a chess variant wherein the pawns could move backwards.  I wondered at the time if this included capturing backwards.  My cursory search hasn't yielded any information on this variant - does anyone know the details?  Thanks!

Sharkboy2021
That’s backward pawns