I was studying this near-useless description:

http://www.simes.clara.co.uk/programs/sudokutechnique6.htm

Shown are some asterisks in rows 1 and 9 with no explanation of what happened to the possible cells in rows 2 and 8, etc.

But anyway, I presumed they contained other digits and was mollified and decided to try a sample game.

So I tried xwing1.

I give up. I evidently don't even understand a bit.

Could anyone stare at xwing1 and tell me in painful detail exactly how I would apply the x-wing concept there.

Thanks,

Mac

P.S. If you refer to a cell, please use the notation (row,column) so that cell (3,5) means to count down three rows and count over 5 columns. OR if there is some standard notation, use it and explain to me how to convert to row,column.