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Fourteen Thirty (1430): A form of the Roman Key Card Blackwood slam convention, considering the Aces, trump King, Queen, and other attributes.  This convention is identical to Roman Keycard Blackwood excepting the first two responses are reversed (03 - 14 as opposed to 14 - 30).  

1430 Roman Keycard Blackwood, Part 1 - Slam Bidding

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More videos:
   1430 Roman Keycard Blackwood,     Blog  Part 1  (login to Blog to see Part 2 and 3)
   1430 RKC versus Blackwood,           Blog  Part 1  (login to Blog to see Part 2 and 3)

After determining trump, the 1430 initiator bids 4 Notrump, with the following responses:

Response

Meaning

5C

1 or 4 keys

5D

3 or 0 keys (0 or 3, however many find 14 - 30 easier to remember, based on the fact making a vulnerable slam scores 1430 points)

5H

2 (or 5) keys without the trump Queen

5S

2 (or 5) keys with the trump Queen

Note: several methods are used show Voids, non-trump Kings, and the trump Queen (with other than 2 keys). 

After 5C or 5D responses, the 1430 initiator may bid the cheapest non-trump call to inquire the presence of the trump Queen.  Some partnership agreements return to trump to deny the trump Queen while others play the treatment reversed.

One common treatment to show useful voids includes:

Response

Meaning

5N

Even number of keycards

6 level of void suit

Odd number of keycards, bidding the void suit

6 level in trump suit

Odd number with a useful void in a suit above trump

Assuming the presence of all keycards and the trump Queen, the 1430 initiator may explore Grand Slam with extra values.  Several methods are practiced by players including:

Method

Treatment

Specific King Ask (up the line)

After the partnership discovers they hold all keycards and the trump Queen, the applicable partner ("the one who knows, goes") makes a bid at the 6 level corresponding to the rank of the lowest King held.  The partnership makes successive King rank bids up the line, skipping the rank of missing Kings or returning to 6 in the trump suit (obviously a major) lacking further Kings to disclose.

Blackwood

Initiator bids 5 Notrump
Show Kings as in regular Blackwood style:
0-4 = first step
1    = second step
2    = third step
3    = fourth step

Blackwood
minus trump King

Same as above, but subtract the previously disclosed trump King

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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