ASTRO - Interference Over a Bid of 1NT

From Club Director Raj comes this article about ASTRO, 

This month I am listing a variety of ways to interfere with a 1 NT opener. See more at Bridge Bum (Astro Bridge Convention - Bidding and Responses). A brief explanation of ASTRO follows.

We intend to feature new Bridge items each week. As they used to say in the olden days of television, 'Stay Tuned!'...

 

  • A defense to 1NT in which a double is for penalty, and 2/ overcalls are artificial.
  • Brozel
  • A defense to 1NT in which a double shows a one-suited overcall, and all 2-level bids show specific 2-suited hands. 
  • Cappelletti (Hamilton)
  • A defense to 1NT in which double is for penalty, and 2-level overcalls are conventional.
  • DONT
  • A defense to 1NT in which double shows a one-suited hand, and 2-level overcalls show the bid suit + a higher suit.
  • Gates Double
  • An artificial double of 1NT by a passed hand.
  • Landy
  • A (very old) defense to 1NT in which a 2 overcall shows both majors.
  • Multi-Landy (Woolsey)
  • A very scientific defense to 1NT.
  • Pinpoint Astro
  • A variation of the Astro convention, using double as penalty.
  • Ripstra
  • A slight variation of the Landy convention.
  • Roche
  • A (very old) defense to 1NT in which a 2 overcall shows 12-14 points and 3+ clubs.
  • SCUM
  • A defense to 1NT that shows two-suiters by Shape, Color and the Major suits.
  • Suction
  • A restricted defense to 1NT that uses ambiguous overcalls.

 

ASTRO: Astro was invented by American players Paul Allinger, Roger Stern, and Lawrence Rosler. The first letters of each player's name are concatenated to form "A-ST-RO"

  • 2Hearts and a minor (at least 5-4 or 4-5). 10+ points.
  • 2Spades and another suit (at least 5-4 or 4-5). 10+ points.
  • 2Natural, 5+ hearts. 10+ points.
  • 2Natural, 5+ spades. 10+ points.
  • 2NTClubs and diamonds (at least 5-4, usually 5-5 or better). 10+ points. Partner should take his preference by replying 3 or 3.

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