A previous post by n95 (currently #5637) contained a position with a SUPG of 3, with a longer UPG of 4.5. I'm wondering if this would count as a position with a gap of 1.5, since instead of having a SPG and a longer SUPG, both methods are UPGs.
No. For that position the gap is zero, since the SUPG is also the SPG. For a gap greater than zero the SPG can't be unique.
A previous post by n95 (currently #5637) contained a position with a SUPG of 3, with a longer UPG of 4.5. I'm wondering if this would count as a position with a gap of 1.5, since instead of having a SPG and a longer SUPG, both methods are UPGs.