Gerber 4♣
February 14, 2017
February 14, 2017

Blackwood 4NT

The Blackwood convention is used when you are thinking of bidding a slam and want to find out how many aces partner has.

  • 5 = 0 Ace or 4 Aces
  • 5 = 1 Ace
  • 5 = 2 Aces
  • 5 = 3 Aces

Asking for Aces

4NT asks partner to show the number of Aces in his or her hand. 4NT is not a bid you would normally make in a natural sequence which makes it easy to remember that something funny is going on!

Notice that the responses start from the lowest available bid. After hearing partner’s response you will normally now be in a position to decide whether or not to bid slam.

Blackwood is used when the last bid was a suit. It is not used after a notrump bid. In that case, you use Gerber.

4NT when partner’s last bid was NT is not Blackwood, it’s the Quantitative 4NT.

This hand has good trumps, honor cards in partner’s suit, an excellent side suit in clubs and a singleton. Slam is a definite prospect. But partner has no aces, so slam is hopeless and you have to be content with 5 losing the A and the A.

This time North shows 1 Ace and South bids the slam.

Asking for Kings

If your side has all the aces, you might like to know how many kings partner has. You should only ask for kings if you are interested in bidding a grand slam, where you need all 13 tricks. Bidding 5NT promises that no ace is missing.


  • 6 = 0 King or 4 King
  • 6 = 1 King
  • 6 = 2 Kings
  • 6 = 3 Kings

More hands:



  1. Profile photo of jeanne jeanne says:

    i want to play the lesson hands on the Blackwood 4NT lesson but it will not let me?
    Can you help me please?

  2. Profile photo of valjef valjef says:

    @graeme thanks for your help!!! Really appreciate it.

  3. Profile photo of jlpurdie jlpurdie says:

    These are really good explanations as to what the calls mean in different circumstances and when to use 4NT versus 4 Clubs when exploring slam. Now all I need to do is put it into practice:)

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