dailysudoku.com

[cgordon]

How come I'm the first to post this one? Are you all stuck?

I found two ER solutions using the two 9’s in C7 that get rid of the <9> in R3C3 (using Box7) or the <9> in R7C1 (using Box1).
Then I used the xy wing <269> to take out the <6> in R7C7. A nice and square wing – easy to spot.

[stevieboy]

I used the xyz-wing <269> in R7C1 to take out the <9> in R3C7:
(first time using ascii diagram - excuse the mess!!!)

+------------+---------+------------+
| 39 4 1 | 5 6 8 | 2 39 7 |
| 36 6 7 | 2 9 1 | 4 38 5 |
| 29 258 59 | 3 4 7 | 69 1 689 |
+------------+---------+------------+
| 5 7 8 | 9 2 4 | 3 6 1 |
| 4 3 6 | 1 7 5 | 8 29 29 |
| 1 9 2 | 8 3 6 | 5 7 4 |
+------------+---------+------------+
| 269 1 4 | 7 58 29 | 69 58 3 |
| 8 256 59 | 4 1 3 | 7 259 269 |
| 7 25 3 | 6 58 29 | 1 4 289 |
+------------+---------+------------+

...that solved it for me!