1. IMP/ImpresisePrecision

ここからたどるのがよい。 http://pfdubois.com/publish/ImprecisePrecision/index.html

http://pfdubois.com/publish/ImprecisePrecision/ImprecisePrecision.pdf

Imprecise Precision Release 8.0 Paul F. Dubois

http://pfdubois.com/publish/ImprecisePrecision/OneClub.html

transfer bid を多用する。

Warning

The 2018 changes to the convention charts include the “Basic” chart, which will be used in ACBL events with a maximum of 750 MP or less, such as Gold Pairs. Under that chart the “transfer positive” responses to 1♣ openings (described here) are not allowed. You will play these bids (1♥ through 2♦) as natural. 

ACBL Convention Charts20 November201 https://web2.acbl.org/documentlibrary/about/181AttachmentD.pdf

ACBLのUnder 750 MPは入門者クラス?

2. summary

2.1. Openig 1C

http://pfdubois.com/publish/ImprecisePrecision/OneClub.html

2.1.1. Response

There is one negative response, 1♦!(0-7, artificial). You will make this bid with less than a good 8 HCP.

Major suit two-level replies are basically preemptive but highly invitational:

All other responses (“positive responses”) show 8+ HCP and are game forcing.

2.2. 1.3 Strong Hands (16+ HCP)

1♣!(artificial, strong, forcing, 16+ HCP)(page 12):

We open 1♣! with any hand with 16+ HCP, except16-17 point balanced hands. We also open 1♣! witha 15 HCP hand containing an excellent six-card suitand a stiff or void. 1♣! has no upper limit and absolutely may not bepassed. The system after this opening is covered in its own chapter,Opening One Club(page 12).

4441のstrong handsが抜けている。-- ToshinoriMaeno 2019-08-03 01:38:36

2.3. 1.4 Balanced Hands

The system is basically the same with an NT rangeof 12-14 HCP or 14-16 HCP.

In the former case an opening of 1♢followed by an NT rebid shows thestronger hand, while in the latter it shows the weakerhand.

One must therefore remember that the NTrebid after 1♢ openers does not deny four spades; with invitational or better values, New Minor Forc-ing should be used to check for a spade fit if one ispossible.

Any balanced hand (with shape 4333, 4432, or 5332)is opened 1♢or 1N if it has the right number of HCP.

This includes hands containing a five card ma-jor, so we play 3♣! as Puppet Stayman after 1N ora notrump rebid.

Stronger balanced hands start with1♣!.

2.4. 1.5 Intermediate Hands (11-15HCP)

If opener opens in a suit, his hand is not balanced if he doesn’t rebid NT.

That means he either opened a 6+ card suit, or has a second 4+ card suit.

•1♢(as short as two, 11-15 HCP)(page 7)

We open 2♣! with six clubs.

•1♡or 1♠(11-15 HCP)(page 6)

•2♣!(11-15 HCP, a six+ card club suit)(page 10)

2D! (11-15HCP, 0 or 1 diamonds)

Note how these bids fit together. With 11-15 HCP, ifyou have five clubs, and no five card major, you areeither short in diamonds and should open 2♢! or canopen 1♢or 1N

2.5. 4.3 1D response

4.3 The One Diamond Response

After the weak 1♢(0-7 HCP) response, openermakes fairly natural bids designed to show hisstrength and shape. TheHeart Relay(page 13) al-lows us to show various strong balanced hands.

After 1♣! - 1♢!(0-7), opener’s rebids are:

See Heart Relay(page 13) for the continuations.

1♠, 2♣, and 2♢show five card suits.

1N!(16-19, balanced)

2♡! or 2♠! shows a strong hand with a 5+card major, like a standard 2♣opener followedby a 2M rebid.

2N shows a 22-24 HCP balanced hand. Sys-tems are on, 3♣is Puppet Stayman.

3♣and 3♢show very strong, unbalancedhands with a long minor suit.

3♡and 3♠set trump and show an extremelystrong hand (9 tricks). Trumps are long andsolid. Partner should cue-bid.

3N is to play based on a long solid suit.Responder’s second bid:• With 0-4, pass, especially if balanced, unlessyou have an Ace.

Over 1♡, the heart relay is on, see below.

• Over 1♠, raise with 4-5 support points; jumpraise with 6 or 7. • Over 1N, systems are on; see Bidding Bal-anced Hands(page 4) for details

2.6. 4.3.1 Heart Relay

The Heart Relay is an optional part of the system. If it is not used, 1♡is treated the same as 1♠, above;

strong notrump hands are bid with 1♣-1♢-1N showing 18-19, a 2N opener showing 20-21, and 1♣-1♢-2N showing 22-24, 1♣-1♢-3N showing25-27.

After 1♣!-1♢!, 1♡! asks responder to bid an ar-tificial 1♠!.

It is usually a hand with hearts, but can bea strong balanced hand, and even more rarely a hand6-5 in the minors.

This bid should be explained as, “A five-card heartsuit or a strong balanced hand; or rarely, a hand 6-

2.7. 4441

positive responses for 1C

If a hand is not balanced and does not have a five-card suit, it is a 4441 hand. Such a hand is called a “rattlesnake”. The bids showing these hands come in two groups: