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Keycard Blackwood - A slam bidding variation from regular Blackwood, designed to increase the accuracy when considering the potential to reach slam or grandslam.  This method recognizes the trump King as equivalent to other Aces, thus five "aces" or keys are considered. In response to a bid of 4 Notrump (Blackwood):

Response

Meaning

5C

0 or 4 keys

5D

1 or 5 keys

5H

2 keys

5S

3 keys

Note: The Keycard Blackwood methodology has given way to the Roman Key Card Blackwood (0314) and Fourteen Thirty (1430) conventions.

Also 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 BlackwoodRoman Gerber.  Slam treatments also include interference of an overcall by opponents, as Negative Slam Double, DOPI, DEPO, ROPI.

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