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Multi 2♦

Multi 2♦ shows a 6-card weak two of either major.

2♦ -
2♥♠!P/C
2NT!(R) INV+
3♣♦NAT F
3♥♠!P/C
3NTS/O
4♣!STR COG
4♦!PRE COG
4♥♠S/O

There are two common approaches to rebid after the 2NT inquiry:

  • Bisect strength and keep all contracts right-sided.
  • Trisect strength but allow 3♥♠ to be wrong-sided.

I prefer trisection because it allows accurate description of a wild 2♦ opening.

2♦ - 2NT -
3♣!INV+, 6+♥
3♦!INV+, 6+♠
3♥MIN, 6+♥
3♠MIN, 6+♠

There are two kinds of choice of games:

  • 4♣ by strength
  • 4♦ by distribution

Such distinction helps judging how to react to interference. Besides, 4♣ lets the strong hand declare. On the other hand, 4♦ closes the auction ASAP.

2♦ - 4♣ -
4♦!TRF, 6+♥
4♥!TRF, 6+♠

Competitive bidding

Passing the double clearly shows a willingness to play in 2♦x. The question is how to use XX. I recommend using XX to complement 2♥♠ and make efficient use of bidding space. This premise narrows the options down to two promising treatments:

  • XX asks for opener’s long major, while 2♥♠ are natural.
  • XX asks for opener’s short major, while 2♥♠ retain their P/C meanings.

I prefer the latter, as the former leaves the meaning of 3♥♠ unclear.

2♦ (X)
XX!Ask for the short major
2♥♠!P/C