Grand Slam Force Aggressive 84 42 73 AKJTbonus deposit no rtg A ROULETTE WHEEL WITH In the card game contract bridge, Gambling 3NT is a special treatment of an opening bid of 3NT. The bid is used to describe a hand containing a minor suit of at. Also written as Gambling Three NT, Gambling Three No Trump, or Gambling 3NT. . This overcall is similar to the Astro convention and/or possible variations. If the opponents opened 3?, I'd overcall 3NT with a flat 16, but also with a flat I also might have a gambling (trick-taking) type of hand such.