Blackwood 4NT
February 14, 2017
Rule of 20 in bridge
February 14, 2017



Opening at the 3-level shows a good 7 card suit but a weak hand. It makes it hard for your opponents to bid!

  • 6-9 HCP
  • 7-card suit
  • 2 or more honors in the suit

Opening with a pre-empt

This is a perfect preempt. Less than an opening hand, a 7-card suit with two of the top three honours.


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