4
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I have applied the techniques I know to eliminate possible candidates. I'm stuck at this stage now, any hints to move forward are appreciated.

I found this puzzle in Microsoft sudoku Android app.

Microsoft Sudoku _ Grandmaster Level

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9
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The bottom row, seventh column, has two options: a 3 and a 7.
If it's a 3 (red), you can fill the 8 and 7 above, and then the 1 and 9 in the bottom left 3x3, so the bottom left corner is a 4.
If it's a 7 (green), you can fill the 4 in the bottom row, third column.
Therefore, the 4 in the bottom row cannot be in the fourth column, and that cell must be a 9.
enter image description here

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  • $\begingroup$ Thank you, with this I could solve it completely. Wow, I still have so much left to learn. $\endgroup$ – swamy May 16 at 11:24

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