2NT as strong no-trump values, usually with a guard in both majors. You should agree whether your no Trump response system is "on" or "off" Higher "2nd" bids are strong, and sound in any suit called. "4th position’s" double of 2H or 2H by responder, or of subsequent "5th position" correction to 2S by either partner, are for takeout. You should discuss when these should be converted to penalty by passing. Other "4th position" bids are similar to 2nd position. It is very important not to pass with opening values; you may not get another opportunity! Other "Multi" openings 2 Clubs may also be used as a Multi opening. It is most commonly seen in conjunction with Benjaminised Acol, where a 2D opening is strong. 2C strong options might be either the game forcing, or Acol Two hand types. Depending on regulations, weak option is usually ambiguous with respect to major, but you may be allowed to include a weak, 5+ diamonds type in addition. Tartan Two bids allow multi-like openings in 2H or 2S, showing either a Strong Two in the suit, a weak 2-suiter including that suit, or (optionally) strong balanced. In essence they combine Acol Two’s with a Lucas Two. A significant disadvantage is that you cannot stop at the 2 level with the weak hand type. References WBF Convention Booklet "Conventions Today", Brian Senior. Chess and Bridge Ltd, London, 2001. ISBN 0-9530218-2-3. "Acol in the 90s", Terence Reese and David Bird. Chapter 14, "The Multi-coloured Two Diamonds", pp 134-140. Robert Hale Ltd, London, 1990. ISBN 0-7090-4143-8. Bridge conventions