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Suggested Defenses Against a MOSCITO type 1D or 1H opening
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Based on some discussions arising from Chip Martel's visit to "The Well", it looks as if the ACBL will be leveraging Bridge Winners for some supporting infrastructure surrounding the creation of new suggested defenses.

So, let get things rolling.

I'd like to kick off discussion regarding what a suggested defense to a MOSCITO type 1D and 1H opening should look like.  In particular, where should the balance be structure between the efficiency of the defense versus ease of use / memory load.

Lets start with a quick description of the 1 opening.

The MOSCITO 1D opening shows

  1. 4+ hearts  Approximately 13 - 14 HCP if balanced (with 11+ - 12 HCP, open 1N)
  2. Approximately 11 - 14 HCP if 5440 or 4441 (weaker hands will pass)
  3. Approximately 9 - 14 HCP if single suited or two suiter
  4. Opener will prefer to show 4+ hearts as opposed to a longer minor
  5. With both majors, show hearts with 4-4, spades with 5-5.  No major suit canape.

The bid is non-forcing.  Partner will bass with weak hands that are not worth a response (typically 0 - 6 HCP).  The bid says nothing about diamond tolerance.   (The primary reason that we prefer to open 1D with Hearts is to align the level of the opening bid with the frequency of the opening. However, we also use 1D - 1H as a relay and the transfer helps to right side the contract)

I'm going to describe a couple possible defenses, both of which are biased towards simplicity.

The first of these tries to ensure that the partnership is no worse off against the 1D opening than the pair would be if the opponents had opened 1H instead.

  1. All bids from 1S+ are identical to what they would have meant if the opponents had opened 1H.  A NT overcall, says that hearts are stopped.  A 2H bid has the same meaning that you would assign to a cue bid.
  2. Bidding 1H shows the same hand types where you would normally make a takeout double of 1H
  3. A direct seat double shows the type of hand where the partnership would normally open 1D.  Partner will advance accordingly, however, the lowest bid in Hearts is shows a limit raise+ in support of diamonds.  A jump cue bid would be natural and show hearts.  (Think of auctions like  (1C) - P - (1H) - 2H)

From my perspective, the major loss with this scheme is that you can't have a sequence like   (1H) - X - (P) - P   In which advancer is passing opener's takeout double for penalty.  However, you may be able to recover a lot of this in sequences like   (1D) - X - (1H) - X      Balanced against this, you are able to show balanced hands with values   

Here's an example of a slightly more complicated scheme which should be pretty familiar to folks who play Raptor or are used to the Overcall Structure.

  1. All bids from 2C+ are identical to what they would have meant if the opponents had opened 1H 
  2. A 1NT overcall shows 4 Spades and a longer minor. A 2C advance is pass or correct. 2D is asks for the minor and range. 2H is a limit raise+ in support of spades. 2S is to play 
  3. Bidding 1H shows a balanced hand with 11 - 14 HCPs.  A "raise" to 2H establishes a game force.  2m shows 5+ cards.  2M shows 4.
  4. A direct seat double is a shapely takeout type double.  If balanced, the hand is a strong NT or better.  A 1H advance is a negative.  Other bids are constructive.

So, before jumping into balancing actions and the like, any thoughts / comments about either of these defenses. As I mentioned in the beginning, the goal here is to have a set of methods where the opposing partnership will be able to apply their usual methods as to avoid bidding misunderstandings.

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