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Un-capturing Pawns would create an interesting dynamic.  For instance,
forcing the opponent to make a reversed two-step move by performing a
reversed en passant.

Might not a player move a power piece to the far rank and demote it to a
Pawn?

And by putting their King in check, they could force the opponent to
remove the threat.  Obviously, there must be the possibility of removing
such a threat.

I'm beginning to really like this variant.