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 Negative Slam Double - A Double of opponent's slam used to indicate either a willingness to continue bidding or penalize the opponents (various treatments are available, including the negative and positive slam Double).   Example:

(1H) - 2S - (4H) - 4S;
(6H) - X

This Double indicates the player has no defensive tricks and, assuming partner's hand is limited to offensive values , suggests partner make a sacrifice slam bid (usually with favorable vulnerability).

See books on Slam and other slam conventions: 1430, Baby Blackwood, Blackwood, Controls, Exclusion Blackwood - Voidwood, Gerber, Grand Slam Force, Jacoby 2 Notrump, Key Card Blackwood, Kickback, Last Train,  NAMYATS, Pick a Slam, Quantitative Notrump Bid, Rolling Blackwood, Serious 3 Notrump, Slam Try - Stayman, Splinters, Opener Jump Shift, Strong Jump Shift, and legacy treatments as Roman Asking Bids, Roman Blackwood, Roman Gerber.  Slam treatments also include interference of an overcall by opponents, as Negative Slam Double, DOPI, DEPO, ROPI.

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