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These variants seem very simitar at first sight, and in its essence they are conceptually very similar. However, the games they produce are quite different in terms of possibilities. These are very distinct members of a family of variants based on the idea of swapping pieces.

I have played these three variants for quite some time, and the results are vastly different. It is not the same, a game where you can bring pieces back after they have been captured, and a game where you cannot do this. This small detail makes an enormous difference in the evolution of chess games using these rules.