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Spinach Chess. Right to make powerfull move alternates between players in variant with two kings. (8x8, Cells: 68) [All Comments] [Add Comment or Rating]
(zzo38) A. Black wrote on 2013-12-10 UTCExcellent ★★★★★

Perhaps a way to make "invulnerability" would be that: king, queen, and chancellor cannot be attacked by spinach moves longer than a sequence of five normal moves, unlessthe moving piece is a king, and any piece that has not yet moved cannot be attacked by spinach moves longer than two, unless the moving piece is a king or pawn. (This results in rules more complicated than you intended, but is another possible subvariant anyways.)

It looks like a pawn can move two spaces forward from its initial position with a spinach move, in order to avoid being captured by en passant, although this doesn't seem it would be a very good move in most situations (although maybe there is one; make up a chess problem if you know of one such situation).