...Thanks very much for this! It is exactly what I needed. I definitely need it for my own clarity - if I try to proceed to other layers with these the wrong way around then I get completely confused! I am a very simple soul and need to make things as easy as possible.
I'm glad that Burgo could help you.
I think the term `parity` is misleading in this case.
People usually call something like this a "parity":
Seemingly, the red and green centre pieces need to be swapped.
Because the number of permutations
would be "1", the parity would be "odd" and people refer to such situations as "parity".
I said `seemingly
` because what you actually need in the shown case is a 3-ycle, e.g. of two
green pieces and one red.
Greg was referring to such a situation.
I have learned that the term `parity` is used incorrectly by twisty puzzlers very often.
So, please, do not feel embarrassed, this is just a piece of information.