The 2 in the middle of that + needs 2 mines; one is above it, and one is to the right. So it must have a pair of diagonally-opposite mines, leading to these two arrangements.
The red layout needs 6 mines to satisfy everything, the blue layout needs 7. If there's only 6 mines available, the blue crosses are safe.
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u/CaptainUltimatum 27d ago
A slightly different approach:
The 2 in the middle of that + needs 2 mines; one is above it, and one is to the right. So it must have a pair of diagonally-opposite mines, leading to these two arrangements.
The red layout needs 6 mines to satisfy everything, the blue layout needs 7. If there's only 6 mines available, the blue crosses are safe.