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Spiral Chess. The royal pieces slide along a spiral trajectory.[All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2021-06-06 UTC

Each King can move along all eight congruent spirals. I had expected that to be clear from calling it a 'fully symmetric' spiral mover (and  the earlier explanation that spiral moves are oblique and have 8 realizations). I have added a sentence now to make that more explicit.