OK, I'm stupid, so explain to me why . . .

[IRLFAN]

I finally figured it out. It would have been much easier had I read the instructions fully. The last instruction states that a pair of boxes without...

[IRLFAN]

So I believe that I have determined the problem. Prior to the new format, when penciling in numbers, if you left the correct number out of the penciled...

[IRLFAN]

It's claiming that R2C2 can only be 7, since 1, 2, 4, 5, 6, 8, and 9 already exist in Row 2. BUT 3 DOESN'T. So someone smarter than me tell me why...