This month I am listing a variety of ways to interfere with a 1 NT opener. Copied from: Bridge Bum. Please research more on these conventions for a better understanding. A brief explanation of Astro is below.

To be continued....each week....

ASTRO

• 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 Landyconvention.

• 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.