Checkback Stayman is a nifty convention which is used most commonly after an opening bid of one of a minor and then a one of a major response with the opening bidder then jumping to 2 NT.
1 
– 1
2 NT – 3
by responder is now checkback stayman
Why are we doing this??
The opening bidder may also have a four card other major suit OR may have 3 card support for the responder’s 5 card major.
Let’s have a look at above auction again:
1 – 1
2 NT – 3
Responses to 3 are as follows:
3 says: I do not have 3 card support for your major suit () nor do I have 4 cards in the other major (
).
3 says: I have 3 card support for your heart suit but I do NOT have 4 spades.
3 says: I have a 4 card suit but do not have 3 card support for your suit.
3 NT says: I have both 3 card support for ’s and also a four card suit.
Now let’s check out the other major suit situation:
1 – 1
2 NT – 3
Responses to 3 are as follows:
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