#10. yeah, not possible especially due to chess.js. Basically, anything that changes piece movement (like being able to drop a piece, or changing the behaviour of some pieces) or how moves are made (1 at a time, so no Marsellais chess) is not possible with chess.js, which interprets moves for lichess. And that category includes crazyhouse, because there is no way to represent a piece being dropped onto the board.
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