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2/1 opening bid

#1 User is offline   maris oren 

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Posted 2020-August-16, 02:49

Playing Short Clubs I can open with 12 HCP, minimum 5 card Major, 4 D or 2 C.
What are the rules for the 2/1 system?
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#2 User is offline   Stephen Tu 

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Posted 2020-August-16, 07:32

There's no real difference with 2/1; 2/1 is based on 5 cd majors, and natural-ish wide ranging non-forcing opening 1 bids. Allowing short doubleton club openings is just a style choice that can be played whether or not you are playing 2/1 is GF

- 1D=4+, 1C=2+ is probably a minority treatment overall (but majority treatment in certain countries). A fair number of people open 1D with 4=4=3=2 shape, so diamonds is 4+ except that particular shape, and 1C is 3+.

- 12 HCP is for flat hands. With shapely hands people open lots of 11s and occasional 10s.

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#3 User is offline   Zelandakh 

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Posted 2020-September-09, 11:04

Open the longest suit that matches the minimum length criteria.
With 2 5-card suits open the higher ranking.
With 4-4 in the minors, open 1 (or NT obviously).
With 2245 and honour strength within NT range, strongly consider opening 1NT.

You might come up with some exceptions later on (particularly with 5M-6m shape) but, to start with, these 4 basic rules will generally give you a good auction.
(-: Zel :-)

half-wit -- Chas_P the racist
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#4 User is offline   Vampyr 

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Posted 2020-September-09, 13:22

View PostZelandakh, on 2020-September-09, 11:04, said:

With 2245 and honour strength within NT range, strongly consider opening 1NT.


Does 搒trongly consider?mean 揳void at all costs?

You could do it I guess if your doubletons are rich in honours. With 2-2 majors pretty much never.
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones -- Albert Einstein
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#5 User is offline   smerriman 

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Posted 2020-September-09, 14:23

View PostVampyr, on 2020-September-09, 13:22, said:

Does “strongly consider” mean “avoid at all costs”?

You could do it I guess if your doubletons are rich in honours. With 2-2 majors pretty much never.

You're in a very small minority there. As Kit Woolsey put it:

Quote

If the hand is strong enough to reverse and is suit-oriented, I will open the 5-bagger. If not, I will open 1NT.

Virtually all 15-16 counts of that shape will be opening 1NT, because there is simply no other option.
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#6 User is offline   helene_t 

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Posted 2020-September-09, 21:41

2/1 doesn't work so well with very light openings, so don't open mediocre 10-counts in 1st and 2nd seat with that system.

Otherwise, as others have said, the rules are the same as for other "natural" 5-card major with strong notrump (SEF, Standard American, Standard Hoog, Forum-D etc).
... I am not at all keen on arriving at the 4 level with no idea of where our fit(s) might be. --- Zelandakh
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