Playing 2NT as game forcing is quite effective combined with our 2♣ as Invitational Puppet Stayman, and 3♦ looking for a minor suit slam. It is superior to Two-Way Stayman because you get to describe all the same hands Two-Way Stayman does, plus you get to play 2♦. 2NT Game Forcing is easy to respond to because you bid your shape as if partner opened 2NT (standard).
After 1NT - 2NT:
- 3♣ - Puppet Stayman (the most common rebid)
- 3♦ - 5 hearts
- 3♥ - 5 spades
- 3♠ - 5-4 in the minors, 12-13 HCP
- 3NT - No interest in any other contact
After 1NT - 2NT - 3♣
- 3♦ - One or both four card majors
- 4♣ - 4-4 top of the range
- 4♦ - 4-4 bottom of the range
- 3♥ - 5 hearts
- 3♠ - 5 spades
- 3NT - Neither 4 nor 5 of either major