Well the 2 in the corner obviously needs two mines next to it. It is flanked across the aisle by 1s in each direction. But clearly you can't put the two mines next to each other, or you'd be doubling up on the 1s. Thus the only way is a mine above and to the right of the 2 in the corner.
12X
XO3
2X1
If you did
12X
XX3
2O1
Then the 1 on top will explode.
12X
OX3
2X1
This has the same problem with the 1 on the right
No guesses required!
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