What would be the next move?

Link to this sudoku

enter image description here

  • 2
    $\begingroup$ There are online solvers that go through step by step using methods that humans can do... $\endgroup$
    – Dr Xorile
    Mar 29, 2021 at 1:36
  • $\begingroup$ You have a 237 triple in box 6. That lets you place the 6 in box 6. $\endgroup$
    – Bass
    Mar 29, 2021 at 6:46
  • $\begingroup$ Welcome to Puzzling! Check out our tour. Note that you can upvote and/or "accept" my answer if it solved your problem. $\endgroup$
    – bobble
    Mar 29, 2021 at 15:08

1 Answer 1


First, let's list all the possibilities for the 3x3 box in the middle of the left edge:

possibilities listed

Now, for the deductions:

Observed the four green cells. In all these cells, only (1, 5, 8, 9) are the possible numbers. Since there are four green cells and four numbers to share, each cell will have one of (1, 5, 8, 9). Therefore no other cell in this box can use any of (1, 5, 8, 9). We can remove those numbers from each other cell's candidates.

That gives us:

possibilities removed

It should now be clear that:

R4C8 must be 6, there are no other possibilities.

Hopefully that's enough for a "next move"

Disclaimer: I did not figure this out myself, but used this sudoku solver to point me in the right direction. Images made with Penpa+

  • 1
    $\begingroup$ Same logic, but a bit more simply: there are two sets of 237 looking at box 6, creating a 237 triple, which is enough to place the six. $\endgroup$
    – Bass
    Mar 29, 2021 at 6:59

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