The origin of this conventional method is unknown. The purpose of this defense method is a means of competing in the auction following a 1 No Trump opening by an opponent. The intervenor is able to communicate pattern descriptions to partner regarding a one-suited holding, two-suited holdings, and three-suited holdings.

Features of the Concept

The reasoning is that the defenders can enter the auction on the two level and show unbalanced patterns, and instead of defending, it becomes possible that the partnership declares. As with many competitive defense methods against a No Trump opening, other factors have to become part of the equation such as the state of vulnerability and also the number of working values as well as the number of losing tricks.

The one-suited holding contains generally a 6-card plus suit and approximately values of ten plus points. The evaluation can also be based on the Losing Trick Count method, and based upon this method the decision to compete or not to compete is made. The maximum number of Losing Tricks must not exceed eight Losing Tricks.

Two-suited holdings should contain a minimum distribution of 5-5 by unfavorable vulnerability and a minimum distribution of 5-4 by favorable vulnerability. A distribution of 4-4 in both suits can be the exception if all working values are in the two suits, such as: AQJ9 and KQ10x, which promise a combined minimum of three winning tricks. This approach, however, is deemed highly aggressive.

     
     

Foundation of the Concept

All intervening overcalls from 2 Hearts through to and including 3 Diamonds are natural and promise a one-suited holding in the suit bid. The nature of the overalls are shown below. No examples are provided for the purpose of additional clarification since the concept is self-explanatory.

Intervenor Meaning
Double: This is an artificial overcall and promises a two-suited holding with Hearts and an unspecified Minor suit.
2 Clubs: This is an artificial overcall and promises a two-suited holding with Spades and a second unspecified suit.
2 Diamonds: This is an artificial overcall and promises a three-suited holding, with no suit specified.
2 Hearts: Promises a one-suited holding in Hearts with a minimum of 6 cards. Natural.
2 Spades: Promises a one-suited holding in Spades with a minimum of 6 cards. Natural.
3 Clubs: Promises a one-suited holding in Clubs with a minimum of 6 cards. Natural.
3 Diamonds: Promises a one-suited holding in Diamonds with a minimum of 6 cards. Natural.

After a Double by Intervenor

Following a double overcall, showing a two-suited holding with Hearts and an unspecified Minor suit, if the advancer has support for Hearts, then the advancer can bid Hearts on the lowest level showing minimum values. If the advancer has additional values and Heart support, then the advancer can jump raise in Hearts to show more than minimum values. The double is one-round forcing if the partner of the No Trump bidder passes. If the partner of the No Trump bidder bids, then the advancer may pass and await further action. A pass by the advancer in this bidding sequence generally shows no support in Hearts.

Note: If the advancer has no support for Hearts, then the advancer has the opportunity of bidding the cheapest higher-ranking suit, a relay bid, to ask for the Minor suit. This is a specific 2 Clubs bid following a double. If the second, unspecified suit of the intervenor is Clubs, then the advancer may pass. The probability that the advancer is void in Clubs is very slight and 2 Clubs could be the better contract. If Clubs is not the second, unspecified Minor suit, then the intervenor corrects to Diamonds on the two level.

After an Overcall of 2 Clubs by Intervenor

Following a 2 Clubs overcall, showing a two-suited holding with Spades and a second suit (Hearts, Diamonds, or Clubs), if the advancer has support in Spades, then the advancer will either bid Spades with minimum values and a semi-flat distribution, or jump with good support and a possible singleton in a side suit.

If the advancer does not have support in Spades, then the advancer will relay with 2 Diamonds. If Diamonds is the second unspecified suit of the intervenor, then the intervenor will pass. If Diamonds is not the second unspecified suit, then the intervenor will bid either 2 Hearts or 3 Clubs to show the second suit.

After an Overcall of 2 Diamonds by Intervenor

Following a 2 Diamonds overcall, showing a three-suited holding such as a 4-4-4-1 or 5-4-4-0 distributional pattern, the advancer has the following options:

Intervenor   Advancer   Meaning
2 Diamonds       Shows a three-suited holding.
    2 Hearts   Shows a long Heart suit and minimum values. The 2Diamonds overcall is one-round forcing and advancer must respond if the partner of the No Trump bidder passes.
Pass       If the intervenor does not have a void or singleton in Hearts, then the intervenor passes.
2 Spades       Following a 2Hearts first response, the intervenor shows with this bid shortage in Hearts and seeks support in Spades.
        Note: Continuations by the Advancer
        Pass: f the advancer has good support (at least 3 card support) in Spades, then the advancer passes.
        3 Clubs: If the advancer has minimum support in Spades (two or fewer), then the advancer will rebid Clubs with better Clubs.
    2 NT   As a first response to the 2Diamonds overcall the advancer can show excellent game values to semi-game values opposite generally a weak 1 No Trump opening. Opposite a strong 1 No Trump opening with a 15-17 point range, the player must make a judgment call as to whether game is possible. Following this first response by the advancer, the intervenor is required to identify the suit, in which there is the shortage.

 

 

If you wish to include this feature, or any other feature, of the game of bridge in your partnership agreement, then please make certain that the concept is understood by both partners. Be aware whether or not the feature is alertable or not and whether an announcement should or must be made. Check with the governing body and/or the bridge district and/or the bridge unit prior to the game to establish the guidelines applied. Please include the particular feature on your convention card in order that your opponents are also aware of this feature during the bidding process, since this information must be made known to them according to the Laws of Duplicate Contract Bridge. We do not always include the procedure regarding Alerts and/or Announcements, since these regulations are changed and revised during time by the governing body. It is our intention only to present the information as concisely and as accurately as possible.

 


     
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