Page 10 - SPBC-apr-2019
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                Checkback Stayman is a nifty convention which is used most commonly
         after an opening bid of one of a minor followed by a one of a major response with
         the opening bidder then jumping to 2NT.  Example:
                1♦ - 1♥ - 2NT - 3♣ by responder is now Checkback Stayman!
                Why are we doing this?  The opening bidder may also have the other four-
         card 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♥ - 2NT - 3♣.
                The opener’s 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 ♥ 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.
           3NT says: I have both 3-card support for ♥ and also a four-card ♠ suit.
                Let’s check out the other major suit situation: 1♦ - 1♠ - 2NT- 3♣. The opener’s
        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 ♠ suit but I do NOT have 4 hearts.

           3♥ says: I have a 4-card ♥ suit but do not have 3 card support for your ♠ suit.
            3NT says: I have both 3-card support for ♠ and also a four card ♥ suit.
            The only time you would ever use this convention is if you have 4-4 in

          the majors or you have 4-5 in the majors or you have one five card major.

                The responder now places the contract, equipped with more information
         about opener’s hand.
                Let’s look at two situations in which it would be useful to be playing
        Checkback Stayman:

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