 Code: Select all
35  82
1 3 
84  
++
5 1 4387
841 9523
3  5 1 4
++
3  5 4
4  6 58
25 4 76
I've noticed that the 8th column can be narrowed to the following possibles (using the 1/3 pair):
8
(6/9)
(1/3)

7
2
(6/9)

4
5
(1/3)
Where the numbers in brackets are the possibles for those squares.
I can't find any other pairs or triples, or any mistakes but I'm totally stuck  I've spent over an hour checking and searching. Any help is much appreciated.