Bidding after 1NT opening takes place according to Rubensohl scheme if the first opponent bid 2♣/2♦/2♥/2♠.

Answers as far as possible:

• • double - negative double;

  • 2♦/2♥/2♠ - any remaining available 2 level bids are natural and to play;

• 3 bellow the opponent suit - 10+ HCP, forcing;

  • • if the opponent suit is major - the other major four;

    • else - at least one major,

• • 2NT/3♣/3♦/3♥ - respectively 5+♣/5+♦/5+♥/5+♠:

    • • if the suit is 6+ - 4+ HCP;

      • else - 10+ HCP,

  • 3♠ - no majors, no stopper, 10+ HCP.