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Further to Peter Aronson's question and the anonymous suggestion, Feedback Chess could be a variant where a backward move could not capture a piece on the destination but could reintroduce a captured piece on the departure square - feeding them back into the game. Whether the pieces reintroduced should be those captured by the enemy or (as in Shogi) ones own captives but changing sides is open to discussion, and would influence the choice of physical set used (FIDE-array variants can be played with Shogi or even Xiang Qi sets).