x4 is absent, so there's surely an error

Adjacent squares don't intersect, so
< should be <=
> should be >=

You didn't indicate whether lower "y" values are located higher (that's what you used) or lower (cartesian), so I can't verify the if you are comparing the "y"s properly.

In reply to Re^3: Checking if squares intersect by ikegami
in thread Checking if squares intersect by Anonymous Monk

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