Idea for new chess variant

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rainbowwaterfalls999

a 10 by 8 board

10 rows by 8 files

all the same rules apply but there is a additional row behind the pieces on each side so you can move the pieces back.

if you move the king or rook back to the first row, you can't castle.

I don't have a name for it yet. Maybe backwards chess. I don't think it will make the game too long.