lid van
conform
from 12 -15 hp or 26-31 zp,
no 5card major
if balanced, then a 4 card major
if unbalanced, a 5+ card minor
1 Diamond
GEELSE BRIDGE CLUB
lokaal Geels Brouwhuis
Nieuwstraat 41, 2440 Geel 047 0710214
elke dinsdagavond om 19.30u stipt een open bridgetornooi
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
P | meaning | O | meaning | P | meaning | O |
1♥ | 4+c in unknown M 6+hp | 1♠ 1NT 2♥ | 4c ♠ 4c ♥ 2x4c M | or natural or 2♣ relay or 2AM |
asking info 10+hp, 5c AM | s123/456 ("sixpack") |
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| 2♣/♦ | unbalanced in ♣/♦ w/o M | or natural or 2♥/♠ or 3♥ |
10+hp, 5c ♥/♠ MF, ?$
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natural 3♠ /NT=min/max |
1♠ | Duke | 1NT | obligatory | -pass - 2x - 2NT/3x |
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1NT | RF, 10+, 5+c ♣ ? stops in M | 2/3 M 2/3 NT 2m / 3m | stop in 1 major stops in both majors no stop in M | -natural -2/3 ♥ -2/3 ♠ |
?#c in ♣ start control | s12345 ("23415") |
2♣ | RF, 10+, 5+c ♣ ? stops in M | 2/3 M 2/3 NT 2♦ / 3m | stop in 1 major stops in both majors no stop in M | -natural -2/3 ♥ -2/3 ♠ |
?#c in ♦ start control | s12345 ("23415") |
2♦ | 2x5c M, 5+hp | natural (=2♥/♠) | best major |
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2♥/♠ | Muiderberg | idem as Muiderberg |
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2NT | 10-11hp, no 4c M |
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3x | to play, unbalanced 2 minors (6-4, 7-3) |
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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.