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Unsolvable puzzle..
 
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TeddyITC



Joined: 1 Dec 2019
Messages: 1
Offline

I've been enjoying this Sudoku app for many years, and this is the first time I've come across a puzzle I can't solve with logic.

As far as I can tell there is no further clear choice for a cell.

Any assistance or further hints greatly appreciated.

I've checked and the puzzle is still valid, and there is a single solution, just can't find the next "non-guess" step.

Thanks

Pinky



Joined: 11 Sep 2013
Messages: 1
Offline

Sometimes I've used the strategy to assume a choice but remember where I made the choice. Carefully choose this choice. Usually where there are 3 in a row or block. Then play as usual until you either solve or get a conflict. If you get a conflict then you guessed wrong. Back up and use the other choice because obviously that is the correct one.
john_h



Joined: 30 Mar 2014
Messages: 1
Offline

Look at the 8s, digit first. The 2/8 pencil marked cell on the left side, 3rd from bottom. If yo select 8 there, the 6/8 2 above and one left would be an 8, eliminating the 4/8 cell in it's row second from the right. But the 8 in that first 2/8 cell also leaves only the 6/8 toward the far right, one row down. If that 6/8 is an 8, the 4/8 up 3 and right 1 would be all that's left in that 3x3. That's the one that was eliminated before. So that 2/8 pencil mark on the left side, 3rd from bottom is invalid.

 
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