1NT 15-17
2♦ both majors
lebensohl applies here:
X is penalty
2NT==>3♣ to sign off, or cue as Stayman with a ♠ stopper, or 3NT as values for 3N with a ♠ stopper
3♣/3♦ forcing, imply that you were doubling hearts
3♥ natural GF
3♠ Stayman no stopper
3NT values for 3NT no stopper
Partner is in the pro's seat, you are in the client's seat
Benefits include:
Plus... it's free!