I am new to Su Doku and still learning. Would appreciate assistance with the following puzzle from the Times. I solved by gussing, but think there must be solid logic that could be used.
Orginal puzzle:
,,,87,,,5
13,,,,487
,,,,,5,,,
,2,,,,174
,,,,,,,,,
893,,,,2,
,,,7,,,,,
614,,,,98
5,,,98,,,
I got this far:
,,287,,,5
135,,,487
,,8,,5,,,
256,8,174
,,1,,,839
893,,7526
3897,,,5,
614,,,798
527,98,4,
Please help me understand the next step.
Thanks