I'm pretty new to Sudoku. I've managed to do some graded "Hard" in the local paper (they're Pappocom) but I'm absolutely stuck on this "Medium":
*** *5* *9*
3** *** **6
**4 82* 57*
2** 6** 7**
*** 5*1 ***
**7 **3 **8
*38 *65 2**
7** *** **5
*5* *9* ***
Which I've worked out to:
*** 35* *9*
3*5 91* **6
**4 826 573
2*3 689 75*
*** 571 ***
5*7 243 **8
*38 *65 2**
7** *3* **5
*5* *9* ***
I've read about "fishes", "chains" and "wings" on this website but it's all beyond me at the moment. I'm not interested in trial and error. Is there anyone generous enough to give me a hint about how to proceed and thereby save my sanity? Thank you.