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THis is used to stop below game after opener has make a jump rebid of 2NT. Responder Bids 3C - Responder MUST bid
3D or 3 of Responder's major suit with 3-card support. This allows Responder to bid on very weak hands with good distribution and support for partner's opening minor suit.
E.g.,
South
J10943
87
K964
85
North East South West
1D P 1S P
2NT P 3C P
3D P/O