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at a certain point with large boards and many pieces, a variant should
probably have multiple moves per side at a time, instead of 1 move per
side...

or the pieces should be really powerful...

if you have a large board with single-moves and weak pieces, time can
become a factor... some people might think it takes too long to play

so i would imagine that, when designing the 'ideal' large board chess
variant each of us attempts to factor these considerations in

board size
piece power
moves per side
time