Answers - undisturbed

• Pass : < 6hp

• 1♥ : RF, 6+hp, 4+c M. The opener rebids 1♠ with 4c♠ and 1NT with 4c♥. WIth both majors the rebid is 2♥. All RF because partner can be weak, limit , or strong. When the partner has a 5 card M with 10+hps, he will now bid 2 in this major suit. RF. As such, a fit in a major, if any, is found soon.  The partner decides in a natural way the final contract, be it  in the major suit, be it in NT.

Yet, in Jazz we apply special bid-roads for partners with slemambition. Typically, an "impossible" or "superfluous"  bid eg. in a suit that been denied before, is asking either for the unknown parameter (eg. strength) either to start controle.

Eg. after 1♦- 1♥ -2♥ there is for 100 % a fit in a major found. A modest partner will now bid this contract incl. pass. A more ambitious partner can ask the strength (min/max) of opener with 2NT ! The answer is s1=min , s2=max.

Eg. after 1♦- 1♥ -2♣/♦ the partner can show ambition with 3♥ (NAFB-Next Available Free Bid"). The answer is s1 (3♠)=min , s2 (4♣)=max.

After 1♦- 1♥ -1♠/1NT , the partner can find out more information about openers hand via 2♣ (relay).He will do this typically when ambitous for slem. Indeed, when strong enough for the game, he bids the game contract. With a limitted hand (10-11hp), he will invite for game. Therefore, going via 2♣ must mean a stronger hand. The answer is according the "sixpack"-convention which is also used in the  handling of the 1 NT opening. The answer is one of 6 steps indicating   :  s123 = min,no 5 card/5c♣/ 5c♦  s456=max,  no 5 card/5c♣/ 5c♦

• 1♠ :  RF, 0-9hp, all distributions. The DUKE-convention (see Strategy in menu). The opener is expected to bid 1NT. The partner with a balanced hand and 8-9hp will pass. Holding a 5+c in x, 0-9hp, he will bid 2x. Having a two suiter with 10-11hp, he can show this via 2NT,  and 3x. Together with the direct 2♦ bid, all possible 2 suit combinations can be addressed.

• 1NT/2♣ : RF, 10+hp, no 4 card M , 5+c ♣/♦ . A fit in a major suit is not possible because the opener has never more than 4c major. The first priority now is to reach a NT contract, because it is also well 'paid' considering the number of tricks to be made. Therefore, the opener must now show his stoppers in the major suits by bidding the major-suit (2/3) with stop and 2/3NT when stopping both majors. The level of his bid shows his strength : 2-level=min  (12-13hp), 3-level=max (14-15hp). If opener has no stops in the major, he will show whether or not he has a fit with the promised minor of the partner.

After this investigation for stops the partner can place the endcontract. We know this contract can never be in a major. A bid in a major suit is therefore an ideal forcing bid to show slem ambition. We agree that an economic

- hearts bid means "tell me how many cards you have in my minor suit". The answer is given stepwise according '23415'.

- spades bid means to start control.

• 2♦ : RF, 5+, 2x5c M. Because the bid is a kind of transfer, we can show this hand when weak, limit or strong. The opener who must have at least a 2 card in major, chooses his best major suit for a 2M contract in case of a weak partner who will pass. When that partner has 10-11hps (limit) hr rebids 2NT. A stronger partner will now bid with 3m his  shortest minor and in case of 6-5major bid with 3M his 6card.

• 2♥/♠ : NF, <11hp, 5c ♥/♠  with 4+c m (handtype of Muiderberg). Also the continuation is identical as if partner would have opened wih Muiderberg. Opener will rebid 2NT only with a maximum hand (14-15hp).

• 2NT : NF, 10-11 hp, no 4c M

• 3♣/♦: NF, 6-4 or 7-3 in ♣/♦, at least 10 unbalanced cards in the minors

The 1♦ opening forms together with the 1NT opening a tandem to treat all hands  without a 5 card major.

Because a partner can easily and cheap show a 4 card major after the 1♦ opening, we define this opening in that direction : all hands with one or two four cards major are bid via 1♦ . Consequently, the (weak) 1NT-opening denies a 4 card major and makes Stayman not neccesary.

As we want the 1NT-opening also to reflect a balanced hand (5332,4432,4443), the consequence is that the 1♦ opening also can contain unbalanced hands, with a minor. That's why we defined the 'sixpack' convention in order to discover the handtype.

Different from the treatment of the 1♣ opening where the opener has the lead in the auction, here information is exchanged in a dialogue manner and because the opener is from the start limited till 15hp, it is the partner who becomes 'the leader of the auction'.

When  opponents overcall  1♦ ?

If the opening is doubled, we play SYSTEM  ON, meaning that we ignore the double. We gain an extra option : XX that we use for showing 2x4c M, 10+hp

If the overcall is different from double, we play SYSTEM OFF, continuing in a natural way.

After an 1♥/♠ overcall,  we play the "2-way double" :

-or 10+hp w/ or w/o 4c AM

-or 8+hp  and 4c AM

Ergo : 1♦-(1♥)-1♠ = 5c♠                      1♦-(1♥/♠)-1NT : 6-9hp with stop

If the overcall is 2x, we double when 8+hp,  showing the majority of hp and we bid 2y with 5card in y and 10+hp.