Practice
Naked pair
Row 2, column 4 is open. Select it and note what it could be, with Centre marks.
Hint
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
7
8
6
3
4
2
1
1
Digits
Corner
Centre
Colour
Digits
ABC
1
2
3
4
5
6
7
8
9
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