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Switching Chess is a natural idea and surprisingly not in Pritchard, though I prefer its embodiment in one piece (Swapper) with unfriendly units too. Also, another pathway to an infinitude of Chess variants, as I first describe under Slide-Shuffle, utilizes this position-Shifting Chess idea. Take the 2000 games in CVP. Suppose each has average of ten piece types(approx). Let just one type of piece initiate 'Switch,' and add that sub-rule to each different game-rules set: 20,000 distinct games emerge. Let any two piece-types do so: close to 200,000 sets of rules. Allow Switching from only a subset of 8 or 10 squares: about 2 million separate ways of playing. Continuing with these factors in combinations -- switching only coordinated by squares across various diagonals (of rectangles),odd, even, prime, etc.: that one is good for 1000 per game anyway, giving 2 billion now. Randomized baseline and Pawn positioning added: 2 quadrillion, and so on, a switch-trade after capture, before check, on Move 5 or on Move 11, adjacent to Pawn, before King, the ideas are endless; somewhere between quadrillion and Googol (10*100)--as commented Slide-Shuffle-- is a practical infinity for Earth-bound minds.