Currently this document describes the standard as defined in the 1/1995 issue of Finnish Bridge magazin. Beware: there is a newer version, "modern standard".
This English document is the author's translation of a Finnish version. Neither of these documents is official.
1 of a suit 4+ cards limit, Stenberg, splinter
1 NT 15-17 hcp balanced; two-way Stayman, Gerber, Texas
5 card major allowed
2 clubs forcing to game 2 diamonds negative or relay,
or 23-24 hcp bal. others natural and positive (GF)
2 D/H/S 6 cards, 6-11 hcp 2 NT asks
2 NT 20-22 hcp balanced; Baron, Flint, Gerber, Texas
5 card major allowed
3 NT gambling, 4 C suit-searching,
no side strength 4 D asks for shortness
4 C/D strong pre-empt 4 H/S signoff;
in hearts/spades others controls/Blackwood
Jump overcalls are weak.
Takeout double promises either support to unbid suits or extra strength.
1 NT overcall promises 15 - 18 hcp. Partner can then make a major suit query by bidding 2 clubs, unless the opening bid was 1 diamonds, in which case the major suit query is 2 diamonds.
Fourth-hand 1 NT (protective no-trump): 11 - 14 hcp.
Michaels cue: an overcall in the opponent's suit promises at least 5 cards in the highest unbid suit and in another unbid suit.
Unusual 2 NT. (Promises at least 5 cards in the two lowest unbid suits.)
In response to a 2 diamonds opening, 2 NT is a query, to which the opener responds:
In response to a 2 hearts/spades opening, 2 NT is also a query, but with the wollowing responses:
3 NT openind is gambling: solid minor suit, usually no side strength. A 4 diamonds response asks for a shortness, with the following responses:
The 2 clubs query must not be made without a reason. For instance, in the series 1 NT - 2 clubs - 2 hearts - 2 or 3 NT the responder promises a spade suit of four cards.
After the 2 diamonds query the opener rebids:
This convention is also applied in the series
2 clubs - 2 diamonds - 2 NT - 3 clubs.
Flint
After a 2 NT opening, 3 diamonds commands the opener to rebid 3 hearts.
Then the responder rebids:
This convention is also applied in the series
2 clubs - 2 diamonds - 2 NT - 3 diamonds.
Gerber
After a 1 or 2 NT opening or after the series
2 clubs - 2 diamonds - 2 NT, a 4 clubs bid asks for aces, with
the following responses:
With a minimum hand, the opener's rebid is always 3 clubs. Thus, other rebids by opener show a better than minimum hand, and in addition to this
The strength required for the bid depends on the bidding series. A basic splinter (eg 1 hearts - 4 clubs) promises about 11 - 15 hcp.
The standard does not specify exactly, when is a splinter. It states that an unnecessary jump is a splinter, if there is some other way of making a slam invitation in the latest suit bid without difficulties. An example is the series 1 diamonds - 1 hearts - 1 spades - 4 clubs. On the other hand, the series 1 hearts - 1 spades - 2 hearts - 4 clubs is an example of a series where a jump is not a splinter but only a control bid (shortness or genuine control).
After Blackwood, 5 NT asks to show kings by control bids.
The bid promises that the pair has all aces, so partner
can bid grand slam with sufficient tricks.
Control bids
The first control bid promises first-round control
(ace or void).
In a control bid series,
4 NT is Blackwood only
immediately after the first control bid;
otherwise it is a general forward-going bid.
Free 5 NT
Free 5 NT is a trump honour query, with stepwise answers:
6 clubs = 0 honours, 6 diamonds = 1 honour, 6 hearts = 2 honours and
6 spades = 3 honours in the trump suit.
Raise of fourth suit by opener promises a maximum opening without a natural bid and is forcing to game.
2-over-1 is forcing up to two of the opening suit.
Reverse at the level of two by opener promises additional strength and is an unlimited round force, also after 1-over-1 response.
A game force that has been established cannot be cancelled later.
After opponent's interference with 1 NT, a bid in a new suit by responder is not forcing, and 2 NT is a game force with a distributional hand.
4 NT as a raise of a natural no trump bid is quantitative, not ace asking.
4 NT in a tight situation (ie when opponents have bidden so that natural forward-going bids are not available) is neither natural nor ace-asking.
After redouble, ie when opening bid has been doubled by an opponent and redoubled by responder (and the other opponent has passed), a simple rebid by opener shows that the high-card strength is minimal, and a jump rebid promises more playing strength but not more high card strength. Thus, with good high card strength, the opener in this position passes even with a distributional hand.
Responsive double is applied in a bidding series where an opponent has made an opening bid in a suit and after a double or an overcall the other opponent has supported the opening suit. (Eg 1 hearts - X - 3 hearts - X or 1 hearts - 1 spades - 2 hearts - X.) If the other opponent has bid a new suit, a double is not responsive; in this situation, if partner had doubled, a double is for penalties.
If there is, after partner's opening bid, a jump overcall higher than 2 spades, then a double is conditional/optional, promising a few useful cards but not necessarily support to unbid suits. The same applies to situations where the doubler is "under" the suit or the opponents have a fit in a suit.
A protective double by a hand that has passed after a takeout double is a takeout double by a weak hand. (Thus, the standard does not allow a "bush pass" after a takeout double, ie passing with an opening strength and shortness in partner's suit.)
A double is for penalties especially in the following situations: