Yesterday I was working the BrainBasher 1-13-09SuperHard puzzle.

On coming to a dead end I referred to my solver's (SudoCue)

Solvers Log and encountered my first Sue de Cog. Rather than

trying to figure out the brief explanation, I went directly to

Sudopedia

http://www.sudopedia.org/wiki/Sue_de_Coq

Alas, I am still too dumb to figure the example out even with the

beautiful colored picture. For this reason I'm not even posting

my BrainBasher puzzle, at least at this time. So explanations of

two puzzles don't get confused in this thread.

Could someone explain what the letter N equals in this Sudopedia

example. (I believe it MUST be 9, since there is 9 cells in a row

and 9 cells in a box) I believe the first subset (A) is r3, and

2nd subset (B) is box 3. The 'intersection' r3c7,r3c8,r3c9, has

candidates 1,2,5,8,9.

"Candidates can be eliminated from the cells in the line that are

not in A, and the cells in the box that are not it B."

If 'the line' is row 3 and is subset A, this doesn't make any

sense to me.

I figure maybe someone who DOES understand this technique could

put this another way, possibly? In other wording? So that it'll

sink into my recalcitrant brain.