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When one piece attempts to capture another piece there are only two directions involved […] no need to complicate things with other directions.

Ok, I'd sort of guessed that might be the case, but it'd be worth making explicit on the page. And it doesn't answer (a) which piece goes where (attacker back where it came from and defender away?), or (b) what exactly constitues ‘opposite’ between a radial and a knightwise direction

The reshuffling of fields every turn and concealment of their nature unless interaacted with still seems unnecessary to me; you'd be as well (unless I've missed something major) rolling a die once every time a capture is attempted to see whether it proceeds as normal or favours white/black (or causes repulsion in the case of matching nonzero charge).