Grand slam force

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The Grand Slam Force is a bidding convention in contract bridge that was developed by Ely Culbertson in 1936. It is intended to be used in cases where the combined hands of a partnership are so strong that a slam (winning at least 12 tricks) is a near-certainty and a grand slam (winning all 13 tricks) is a possibility. It allows one partner to gain information on the quality of trumps in the other partner's hand.

When this convention is in force, a bid of 5NT (notrump), when it does not conflict with other conventions used by that partnership (e.g., a 5NT Blackwood bid), is forcing to slam in the suit last bid, unless the trump suit has already been agreed on earlier in the auction. The partner of the 5NT bidder bids as follows:
  • 6 of the agreed trump suit if holding one of the top three trump honors (e.g., the ace)
  • 7 of the agreed trump suit if holding two of the top three trump honors (e.g., the king and queen)


For example, if a partnership is using the Grand Slam Force and one member bids 1<font color=red><font size=4>♥</font></font> and his or her partner bids 5NT, it is implied that hearts are the desired trump suit. The original bidder will sign off with 6<font color=red><font size=4>♥</font></font> with one of the top three heart honors, and bid 7<font color=red><font size=4>♥</font></font> with two of the top three heart honors.

As with all bidding systems, the Grand Slam Force has its...
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