Can you help me with a logic to solve this puzzle?

Question

enter image description here

I know the concept of pairing and removed pairs but what other concepts should I use to solve this?

You could try guessing and check if it works in your mind, like when there are two possibilities, like in the bottom right square. — Duck, Commented Oct 7, 2019 at 16:23

Jaap Scherphuis · Accepted Answer · 2019-10-07 17:46:50Z

4

There is only one place to put

a 6 in column 1

followed by the

6 in row 6

answered Oct 7, 2019 at 17:46

Jaap Scherphuis

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$\begingroup$ Could you add a rationale? $\endgroup$
– 030
Commented Oct 14, 2019 at 17:54
$\begingroup$ @030 Is it not obvious? There is only one cell in the first column that still contains a small 6. $\endgroup$
– Jaap Scherphuis
Commented Oct 14, 2019 at 17:57

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