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@Gerd: I usually don't involve myself with publishing of submitted pages, and limit my editorial activities here to providing old articles with Interactive Diagrams. That doesn't stop me from commenting on things I read here, if it seems a useful contribution.

@Jean-Louis: Indeed, variants that recycle pieces have existed since the birth of modern Shogi several centuries ago. But the mechanism by which the captured pieces are re-introduced can make all the diffrence in the world. Dropping on an arbitrary empty square, even as a separate turn, makes for a highly aggressive game, where the most important tactics consists of attacking (usually the King) through piece drops. Restrictions on where a piece can be re-appear can meake such tactics impossible, even when theya re introduced immediately. The proposed introduction mechanism will in general not lead to very aggressive introduction of the captured piece.

I have seen other rules for re-introduction of pieces in a less aggressive way (e.g. on the back-rank only, or adjacent to the capturer or a special piece), but these are usually less elegant, because there is no guarantee that an empty square is available there, and additional rules are needed for handling the case when there is none.