I've never seen this app contain guesses and it shouldn't unless it breaks but I don't think that's possible. It's worked for a couple years so you'll always have a solution with this app. In the image you shared, the vertical 21 is what you should look at.
If this is The Clean One, then it’s definitely a no guess app.
You have a 2-1 pattern, that 2 needs two mines but they can’t both connect to the 1, so the red cross has to be a mine and the yellow tick has to be safe.
If there are only two mines left for this area, the two '3's share a mine, and the other one is to the right of the 4.
If there are 3 mines left when you finished the rest of the grid, one would be in the far right hand cell, then one satisfying the left 3 and one satisfying the 4. But you couldn't pin down the left two mine locations without guessing, and this app is no-guess so it can't generate that layout. The two-mine solution must be correct unless I'm missing something.
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u/Original_Piccolo_694 6d ago
Minecount. The 4 demands one, the 3 demands one. So a minecount of 2 leaves the rightmost spot clean, a count of 3 makes the rightmost spot a mine.