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I guess the problem is similar to that in Shogi and Crazyhouse. I am not sure these games even have 50-move rules.
Twilight chess is interesting. I think the page is not quite clear how the 50-move draw rule works with pawn warping. I guess, technically, warping a pawn is moving a pawn, so it resets the 50-move counter. But pawn moves normally reset the counter because they are non-reversable. Now I guess all pawn moves are reversable because warping allows them to go backwards. I'm not sure I like this. The non-reversability of pawn moves is one of the defining characteristics of Chess.
I encountered two variants which seem not yet decribed on the CVP: MiniChess / SpeedChess, wich is played on a 5x6 board, and even has a described sub-variant MiniChess 2007 which adds a color-swap non-capture move to the bishop: http://wiki.cs.pdx.edu/cs542-spring2007/mini-chess/rules.html The other variant is Twilight Chess, a variant with piece drops: http://membres-lig.imag.fr/prost/Twilight_Chess/index.html This latter variant seems of fundamental interest, as it decouples the problem of handling drops from the problem of how to handle quiescence search (which makes variants like Shogi and Crazyhouse so difficult): the holding from which you can make drops is not filled by captures, but you can move pieces there voluntarily.
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