## Help with hard puzzle and general logic question

Post the puzzle or solving technique that's causing you trouble and someone will help

### Help with hard puzzle and general logic question

Hi there

I'm fairly new to hard let alone expert sudoku puzzles. And I'm really struggling with the logic, I was hoping you could clear this up for me (this must be a simple question for you guys )

So I have this Hard Puzzle from the Android App "Sudoku.com". I was filling it out with pencil marks and everything, until I got to the point where I accidentally put a 4 in R1C6 (row 1 cell 6), which I didn't mean to.
To my surprise, it showed as correct.
Now I'm struggling to find the logic in that, since I pencil-marked R7C4 with 37 and R9C4 with 17.
So my logic would tell me, that a 4 can't be on the left side of box 8, otherwise what's the point of penci-marking pairs??

So please, explain to me why that isn't the case.
Also, I would love to know what my next step would be ... I thought the elimination of the 4 would really get things going ...

Here's the grid in code, also you find a screenshot of the puzzle attached, where you can see my pencilmarks.

Code: Select all
`. . . | . . . | 6 . . . 6 2 | . . 7 | 4 . . ------+-------+------8 . 6 | . 4 . | 5 3 . . . . | . . . | . 1 6 2 . . | 6 . . | . 4 . ------+-------+------. . 1 | . 6 . | . . . . . 7 | 5 . . | 1 . 3 . 8 3 | . 9 . | 2 . .`

Edit: nevermind, since i posted this question (took very long for my post to be approved by an admin, no offence intended, I honestly forgot I even posted in this forum )
I got more experienced with hard and expert sudokus.
I retract my original question... rookie mistakes

sorry to have wasted precious internet space with my postings.
Have a great day... cheers
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philtronic

Posts: 1
Joined: 12 March 2020