Source: bridge.ustc.edu.cn

I feel all flat hands with the appropriate HCP range should be opened NT regardless of the fact that you have a 5 card major . Coming with the territory is throwing out Stayman . Stayman invented his convention to ask the NT bidder if she has a 4 card major . It does not have to be that way . It works just as well if it is reversed , the NT opener asks responder for the 4 card major !!

Modified puppet Stayman does just that by a clever use of a relay. 1NT- 2 or  2NT- 3 asks for a 5 card major period. If the NT opener ( 1NT or 2NT ) does not have a 5 card major then she relays to 2 which now asks responder for the 4 card major !!  The invitational 2NT is not lost as 2 has the same effect . Taking the relay to 2 means exactly 4Spade Suit or no majors with a 2NT invite . Partner bids 2Spade Suit with 4Spade Suit and you bail out to 2NT saying you were just kidding about he spades it’s a 2NT invite ! I invented some of the responses below so the Stans of the world might come up with better bids . The 2 relay opens up a number of possibilities ..

The 2 response to 1NT is a modified version of “puppet” Stayman. Responder must have at least game interest unless he is able to pass opener’s rebid of 2, 2  or 2Spade Suit.

West
1NT
?

North
P

East
2

South
P

 

Call
2
2 ,2Spade Suit

Meaning
relay (usually no 5-card major)
5 card suit

West
1NT
2

North
P
P

East
2
?

South
P

Call Meaning
2 exactly 4 spades or no major interest
2Spade Suit exactly 4 hearts
2NT 4-4 or 5-4 in majors; I
3 5-4 or 6-4 in majors; GF
3 4-4 in majors; GF
3 4-4 in majors , GF , stiff club
3Spade Suit 4-4 in majors; GF , stiff diamond
3NT sign-off (was looking for 5 card major)
4 Gerber

Memory aid: After the 2relay responder’s next suit bid is always artificial. Note that a 2 or 2Spade Suitbid denies interest in the major bid and denies five cards in the major shown.

West
1NT
2
?

North
P
P

East
2
2M

South
P
P

 

 

 

Call
2Spade Suit
2NT
3
3
3Spade Suit
4

Meaning
spade fit*; minimum; NF
no fit; minimum; NF
no fit; maximum
heart fit; minimum; NF
spade fit*; maximum
heart fit; maximum

*if responder has 4 spades

West
1NT
2
?

North
P
P

East
2
2NT

South
P
P

Call
Pass
3

3 , 3Spade Suit
3NT
4, 4Spade Suit

Meaning
no major fit; minimum
relay; maximum; responder bids shorter
major (Smolen) or 3 NT with 4-4
that fit; minimum
maximum (no interest in 5-3 fit)
that fit; maximum

*If responder has slam interest, he may continue with a minor-suit splinter, opposite major (natural) or key-card Blackwood.

West
1NT
2
Fit

North
P
P
P

East
2
2M
?

South
P
P

Call
2NT, 3NT
3 , 3
Unfit major
3Spade Suit(fit)
4, 4
4 over 2Spade Suit
4 fit
4NT

Meaning
corrective*; NF
5+ cards; slam try
ambiguous slam try
trump-quality concern; I
splinter; slam try
splinter; slam try
sign-off
key-card Blackwood (fit suit key)

*denies spade fit; 3 NT offers choice of game after heart fit

West
1NT
2
No Fit

North
P
P
P

East
2
2M
?

South
P
P

 

 

 

Call
3, 3
3*
3Spade Suit
3NT
4 over 2NT
4NT

Meaning
5+ cards; 4 card major; GF
clubs; 4 card major; slam try
diamonds; 4 card major; slam try
sign-off
Gerber
quantitative

*If 3 is not available (i.e., if opener bid 3 ) then 3 shows 5+ clubs and 4 shows exactly 4 clubs.

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