No need for a posted apology RJ, simply just adding in the thread:
'I just checked the rules, I never knew that.' would have been fine so
any others who did not know this catch it as well.
Everyone on here gets things wrong, the more you post the higher the chances.
(in your case that appears to about one in every three.)
I recall in a debate about not being able to mate with two Knights me saying
you cannot even mate with 3 Knights.
(I had misread it in a book. It said you can win with 3 Knights if the other player
has a Knight, which got me thinking you cannot win with just three Knights.)
I was wrong, you can mate with three Knights v a lone King.
And of course I always get Helpmate and Selfmate mixed up. Always.
You may recall the date I was wrong. The Moon turned blue and there was
a snowball fight in Hell.
The good news is that someone to prove me wrong posted this link.
Which has been on my favourites list since then. I dabble with it sometimes
trying to compose 3-4 piece mates.
It have this super feature where you can shift the position up and down and
from left to right and get instant answers often changing the solution to a
completly different key move.