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in: Bridge World Standard, Notrump auctions, Standard American Yellow Card

One-and-a-half notrump

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One-and-a-half notrump is a treatment for showing balanced hands between a 1NT opening and a 2NT opening. It is done by opening one of a suit, then jump rebid in NT. In the original natural system (Culbertson system and Goren system), it showed 19-21 HCPs, but now the norm is 18-19 HCPs.

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