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Since each piece 'must' exist within an 8x8 area of an opposing piece, what happens when a piece is stranded? Is the player forced to move that piece back into an appropriate position? And if unable, what then occurs with that piece?

I advocate that a player must immediately correct any inappropriate position, or forfeit the offending piece(s). If multiple pieces are 'stranded', a player would only be able to recover one. If in a checking position, the player could be forced to abandon such to avoid capture of their King. And a King in such a position would be considered in check.

As the number of pieces are reduced during play, the potential size of the playing field would likewise reduce. It still may be quite difficult to promote until well into the end-game.

All in all, a great idea. Definite a brain-squeezer.