There are four sequences reaching 2NT, that then invoke Puppet. These are:
2NT opening bid showing a balanced 21-22
2 opening and 2NT rebid showing a balanced 19-20
2 opening and a 2NT rebid following a negative 2 response showing 23+
2NT response to a T-O Double
All Puppet responses to 2NT are transfers except 3 which is a stayman like inquiry for both 5 & 4 card majors.
Primaey objective is that the 2NT bidder always plays the final contract. To achieve this responder always makes transfers:
3 Inquiry: preferable requirement is 3+ cards in each major.
However 2 cards to a top honour is acceptable. Responses are:
No 5 card major but holding at
least one 4 card major (possibly both). [Note some variants use 4 to show both majors this is both unnecessary and potentially dangerous as it takes bidding beyond 3NT.]
3¦ Natural. Shows the 5 card major bid
3NT No Major so NT bidder is 3-3 or 3-2 in the majors
After a 3 reply 3 bidder now bids as follows:
3! Shows a 4 card 'Spade' suit
3! Shows a 4 card 'Heart' suit
3NT No 4 card major
4! BOTH Majors
Now for the transfers, there are no jumps or other deviations!
3 Transfer to Hearts Shows a 5+ card Heart suit. 2NT bidder rebids 3
3 Transfer to Spades Shows a 5+ card Spade suit. 2NT bidder rebids 3
3 Transfer to 3NT. 2NT bidder must rebid 3NT. Maybe partner has Diamonds on his mind then:
You may come across additional bids (extensions), however the Author finds them unnecessary.
Continuations may proceed to game OR directly 4NT ERKCB OR cue-bidding. Following cue-bids TURBO 4NT operates.