how to really know there’s a bomb in one place except when it’s the only place where it could be
Hey, can you send over an example of what you mean perhaps?
There should be 1 bomb in every colour region which also means there is only 1 per column and row
If you eliminated a bomb in a region, the remaining fields in the region will be 100% bomb free.
I marked the Bomb there, so the fields marked S are safe