[r-t] parity

[Glenn Taylor]

--- Mark ---
> Surely the easiest way to find the parity of a row is to convert it to a
> coursing order, then you'll know the parity straight off.

How's that then?

Faced with a CO of  265743 I don't *immediately* spot that it's
out-of-course. Yes, I can do a couple of easy transpositions in my head to
get there, but I don't consider this to be a "straight off" solution.

Is there a trick I'm missing?


Glenn Taylor
Bristol