I have tried a very hard puzzle, got stuck, so went to various Sudoku solver sites which either can't solve it or can only solve it by guessing.
My initial puzzle:
**9 8** 16*
*** *** ***
2** **9 **8
*4* **7 *83
6** 2*4 **7
87* 3** *9*
5** 7** **4
*** *** ***
*28 **1 3**
This is as far as I get:
**9 8** 16*
*8* *** ***
2** **9 7*8
14* **7 *83
693 284 517
87* 31* 49*
5** 7** *24
*** *** **1
*28 **1 3**
Is there a way of solving it without guessing? I thought guessing was not part of these puzzles.
Any help much appreciated.
Thanks
David