This is a simple "Hard" from the program, started to fill in an odd 15 mins,
but it has me stumped. I have managed to get this far
*1* 9** ***
*63 *** *97
*** *6* 8*4
3** 586 9**
*** *** **8
**6 491 **5
2*5 *39 ***
69* *** 5**
*3* *57 *89
and have picked up all the obvious pairs, triplets and an X-wing or two, but can't see a way forward. I would very much appreciate a tip.