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After a 1-opening we intervene in a 'constructive' way , meaning that we advise opening strength or nearby. (RO 18) Though, non-vulnerable 8-9hp can be sufficient while vulnerable 11-12hps would be a better starting point. A natural overcall in a suit is done with at least a 5 card.
A double initially promises a 3card in every unbid suit.
A double and afterwards bidding another suit than partners choice, or bidding NT or raising partners suit : 16+hp.
To keep things simple we consider conventional openings (eg. 1♣ in majeurs cinquieme, 1♦ in squeeze) initially as real, natural.
Be it after 1 minor or 1 major, Michaels Cuebid and 2NT unusual, designed to show two five-cards apply.
•Michaels cuebid : 2x5c with one 5c in the HRS (highest remaining suit), preëmptive tendency
•2ZT unusual : 2x5c in the LRS (lowest remaining suit), preëmptive tendency
We distinguish between intervening after a 1 minor versus after a 1 major opening.
The 1NT (15-17hp) gets a separate defence : DONT.
After 1 minor :
The Quincy convention
Only applicable after 1♣/♦ , not after 1 strong club. ♠ ♥ ♦ ♣
eg. ♠AJ8 ♥KVx ♦VBx ♣ xxxx
With this convention we booked very good results. It is very annoying for the opponents as many times your bid to show the 2 other suits is often in their suit. They are blocked and in the meantime you were able to tell you hand. Your partnership is a step ahead, not only at your table but also compared with the other pairs.
A refinement is possible by applying ELC (Equal Level Convertion) :
When you have a 5-4 major in hand after a 1m opener, you can double. But often, as required, partner will pick out his best of the remaining suits..and choose the other minor (am). If your partnership applies the ELC, you can bid the 5card major and partner will realize that you hold the 5-4major, < 16hp.
ELC : " if you bid a suit on the same level as partner after you first had doubled, you do not promise extra values but show a 5-4 in the 2 remaining suits."
By doing so, the 1NT after 1m (Quincy) will show 2x4c M.
After 1 major or 1NT weak :
The defence against 1 major or 1NT happens in a natural way :
(see remark below)
It is a handsome way to show the other major searching for a fit with partner and meanwhile presenting an alternative in a minor if the fit in the other major should not exist.
REMARK : A double after a weak 1NT opening can not guarantee a 3 card in the remaining suits as still the 4 suits are unnamed. Partner must realise this and not think that you have 16+ when you change from suit :
(1NT) - dbl- pass-2♣
pass - 2♥
The 1st defender held ♠AJ8 ♥KVxx ♦VBxx ♣ xx
It is often wortwhile to disturb opponents 1NT procedure as not all partnerships have clear agreements on how to react.
Double – shows any single suit (6 or more cards); advancer bids 2♣, after which intervenor corrects to his actual suit
2♣, 2♦, 2♥ – shows the bid suit and any higher-ranking suit
2♠ – shows spades (6 or more cards)
TWERB Two Way Exclusion Relay Bid
the defence against strong clubs
It probably depends where you play bridge but here we regularly meet opponents who play a strong club based system. It is wise to agree upon a defence. As most of the partners give always in a conventional way (steps of 3hps) the strength of their hand ,before the opener can start showing a suit , one can disturb seriously the normal way of their bidding by intervening and as such consume valuable bidding space . We have adapted the documented Twerb convention into a Jazz-variant as follows :
Immediately after the 1♣ opening the 1st defender has following options :
Quincy Delight Jones, Jr. (born March 14, 1933) is an American record producer, conductor, arranger, composer, musician, television producer, film producer, instrumentalist, magazine founder, entertainment company executive, and humanitarian. His career spans six decades in the entertainment industry and a record 79 Grammy Award nominations, 27 Grammys, including a Grammy Legend Award in 1991. Jones and fellow artist Alison Krauss have won the second most Grammys in history.
Jones came to prominence in the 1950s as a jazz arranger and conductor, before moving on to work prolifically in pop music and film scores.
In 1968, Jones and his songwriting partner Bob Russell became the first African Americans to be nominated for an Academy Award for Best Original Song, their "The Eyes of Love" for the Universal Pictures film Banning. That same year, Jones was the first African American to be nominated twice within the same year for an Academy Award for Best Original Score, as he was also nominated for his work on the film In Cold Blood (1967). In 1971, Jones was the first African American to be named as the musical director and conductor of the Academy Awards ceremony. In 1995 he was the first African American to receive the Academy's Jean Hersholt Humanitarian Award. He is tied with sound designer Willie D. Burton as the African American who has been nominated for the most Oscars; each has received seven nominations.
Jones was the producer, with Michael Jackson, of Jackson's albums Off the Wall (1979), Thriller (1982), and Bad (1987), as well as being the producer and conductor of the 1985 charity song "We Are the World".
In 2013 Jones was inducted into the Rock & Roll Hall of Fame as the winner, alongside Lou Adler, of the Ahmet Ertegun Award. Among his awards, Jones was named by Time Magazine as one of the most influential jazz musicians of the 20th century