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Grand Slam Force (GSF) - With a known fit, a jump bid of 5 Notrump may be used to enquire about partner's top three trump honor.  With 2 or more trump controls, responder makes a Grand Slam call in the trump suit.  Otherwise, the responder signs off in a Small Slam. 

1S - 3S;
5N - ?    
4H - 5N;
 
1S - 2D;
3S - 5N;
 

An adaptation includes includes a lower level step response:

Step

Meaning

1st (6C)

No trump honors

2nd (6D)

Trump Queen

3rd (6H)

Ace or King of trump with only 3 trump

4th (6N)

Ace or King and extra trumps

5th (7C)

Both Ace and King, with support of partner's suit (such as Diamonds in the third example above)

Note - some play 5 Notrump as "Pick a Slam" in a different scenario.

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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