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 Exclusion Blackwood/Key-Card Blackwood (Voidwood) - A slam-related Jump bid after partner's have found a trump fit.  The Jump Suit shows a void, similar to a Splinter bid and invites partner to bid slam.  In most situations, the void suit is bid at the 5 level.

Step

Exclusion Blackwood

Exclusion RKC (0314)

Exclusion 1430

First

0 Aces outside void

0 or 3 Aces outside void

1 Ace outside void

Second

1 Ace outside void

1 Ace outside void

3 or 0 Aces outside void

Third

2 Aces outside void

 

 

Fourth

3 Aces outside void

 

 

Examples of normal Exclusion Blackwood (not RKC or 1430 version):

Bidding

Meaning

1C - 1H;
3H - 5D;
5N

Opener's third step shows 2 Aces outside the Diamond suit (responder's void suit)

2C - 2D;
2H - 4C;
4H

Opener's second step shows 1 Ace outside the Club suit (responder's void suit)

1S - 2H;
5C - 5D

Responder's first step shows 0 Aces outside the Club suit (opener's void suit)

1H - 3H;
4S - 5C

Opener's jump to 4S initiates Exclusion Blackwood with a Spade void (3S would be a splinter bid).  Responder's second step shows 1 Ace outside the Spade suit.

1C - 3C;
4H - 5C

Opener's jump to 4H is Exclusion Blackwood with a Heart void.  Responder's third step shows 2 Aces outside the Heart suit.

1D - 3D;
4S - 4N;
P

Opener's jump to 4S is Exclusion Blackwood with a Spade void.  Unfortunately, responder's first step shows 0 Aces, apparently holding the Ace of Spades.  If opener only holds one Ace (off two Aces in side suits), opener may wish to play in 4N (despite the void) or retreat back to 5D.

1C - 1D;
2H - 3C;
4S - 5C

Opener's jump to 2H promises 19+ points with 5+ Clubs and 4 Hearts.  After responder belatedly shows Club support, 4S is Exclusion Blackwood with a Spade void.  Responder's second step shows 1 Ace outside Spades.

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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