dailysudoku.com

Thanks to everyone for all your help.

Dear Marty
Sorry, I made a mistake. You are correct in that r6c9 is blank. Thanks very much for the speedy reply. I didn't see the UR.

Regards
Ian

Code

xx9 x5x 7x3
x3x 4x2 x9x
6xx xxx xx8

xxx 581 xxx
x7x xxx x4x
xxx 274 xx8

5xx xxx xx2
x1x 6x3 x5x
7x3 x2x 1xx

The Solver says its too hard.

I agree. It was a bit of a slog but not particularly tricky.

There is another x-wing on 6 at R38, C36. With the other x-wing aleady identified the puzzle can be solved.

This is the first VERY HARD Sudoku that I have solved without using HINTs or asking for help. I find the most difficult aspect of solving these is not so much the use of advanced techniques but recogn ...