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I am also going to add the variant rule (discussed below) to the page and add a new preset.

This is a very fun and intriguing game, good job adrian.
I'm wondering if you want to add it to the 2006 Chess Variants World
Championship starting now.

Another possible variant is one in which when a pawn promotes, it remains paired and the one it is paired with changes into the new kind of piece that it promoted to (this is based on a similar rule in Communist Chess).

I'm not clear on what happens in this variant if a pawn is on the 7th rank on a given board, and there are as yet no captured (non-pawn) enemy pieces from that given board. Assuming such a pawn on the 7th rank cannot yet legally promote to anything (nor be allowed to the 8th rank), does anyone know if the pawn in question could still be able to give check to an enemy king on the 8th rank? Perhaps it can give such a check, as similarly happens in a number of Fergus' invented variants.

P.S.: In case it's not clear, in the game's 2-board diagram, the non-pawn pieces that are not coloured (specially at their base) are still considered to be paired, with the same not coloured pieces on the opposite board. For example, the White rook on a1 is paired with the White rook on a1 on the other board in the setup (similar story for the White queens, and for each of the White light-and dark-squared bishops on each board). Looks like a cool game, aside from my rules interpretation question above.

I'd like to playtest a variant of this where one of the boards is mirrored. So capturing an enemy piece on one board would eliminate a friendly piece on the other.

In the case a pawn is on the 7th rank without a piece captured (unlikely), let's say you can move it to the 8th rank and remains a pawn unless its twin promotes later.