With all due respect to Mr. Cohen (and your detailed analysis) we'll have to agree to disagree. Cohen's version does not make the distinction between a "minimum" (12-13 and 3 ♠) and a "maximum" (14 and 3 ♠) hand. Both ranges are bundled into the 2 ♠ response to NMF. Therefore, it logically follows that an invite to ask opener "which do you have?" is required. However, your description (and that in the OP) made the distinction between a "minimum" 12-13 and a "maximum" 14 opening hand. You even stated it was "standard." I agree. So, if opener, in response to NMF, shows the lower range of 12-13 with 2♠, there is no need for an invite. Again, it logically follows that a subsequent 3♠ call by responder is a GF. If opener's third bid in response to NMF is at the two-level or three-level based on strength then I am sure that Mr. Cohen would agree with this logic. I see others have made the same observation. My earlier suggestion (upthread) to play 3♠ as suit agreement and slam-seeking was based on this logic, that 3 ♠ as an invite when 2♠ shows 12-13 is superfluous. Is NMF best? Heck no! We're in complete agreement there.