Two boards, two teams: captured pieces go to your partner.
How to play
Two boards, two teams. You play White on the big board; your bot partner plays Black on the small board. Every piece you capture is handed to your partner, and every piece your partner captures lands in your reserve. On your turn you may either move normally or drop a reserve piece onto any empty square (pawns can't be dropped on the first or last rank; a promoted queen turns back into a pawn when captured). Normal chess rules apply (no castling or en passant), turns rotate: your board, then the partner board. Checkmate anyone on either board and your team wins; get mated on either board and your team loses.