Multi - a 2♦ bid with a major six and a strength of 11- HCP. 

It can be used:

• • as an opening;

  • in defense after the opening of 1NT;

  • in defense after an artificial opening 1♣.

Response without double:

• • 2♥ - pass or correct;

  • 2♠ - pass or correct;

  • 2NT - strong ask;

  • 3♣ - GF on own any six or two-suit 55 – next ask 3♦;

  • 3♦ - invit with fits in both majors;

  • 3♥ - pass or correct - weak;

  • 3♠ - pass or correct - weak;

  • 3NT - contract;

  • 4♣ - show your color by transfer;

  • 4♦ - show your color naturally.

Response with double:

• • pass - 5+♦ or 4♦ and strong;

  • rekontra - bid 2♥ and next pass;

  • 2♥ - natural 6+ to pass;

  • 2♠ - natural 6+ to pass;

  • 2NT - strong ask;

  • 3♣ - natural 6+ constructive;

  • 3♦ - invit with fits in both majors;

  • 3♥ - pass or correct - weak

  • 3♠ - pass or correct - weak

  • 3NT - contract;

  • 4♣ - show your color by transfer;

  • 4♦ - show your color naturally.

After RHO 2♥/2♠:

• double - 14+ HCP, 1-OM, penalty;

• 2♠ - 2+♠, 9-13+ pts;

• 2NT - 14+ HCP, 2+♠.