[Chamaco]

Hi all,
I posted a similar thread on Kaplan inversion (1H-1S/1NT), but then I realized I needed to investigate the basics of the same sequence in "classical" 1NT forcing auctions.

Blow I list 2 sets of sequences, one set of the 1S-1NT forcing sequence, and one sequence for the 1H-1S (natural) sequence after 4th seet preemption.

==========================
Set 1

SEQUENCE 1- double showing strength

1S-(p)-1NT*-(DBL)


SEQUENCE 2- simple overcall

1S-(p)-1NT*-(2m)


SEQUENCE 3- preemptive overcall

1S-(p)-1NT*-(3/4m)


SEQUENCE 4- 2S/2NT showing a 2-suiter

1S-(p)-1NT*-(2H/2NT)

============================

Set 2



SEQUENCE 5- preemptive overcall

1H-(p)-1S -(3/4m)

Is support double on ?
If so, how do you discriminate the strength of hand with 3 card support (e.g. minimum opener with 3 card support, vs reverse with 3 cd support) ?

How do you set spades trumps without signing off if you are interested in slam and want to set trumps because you only need keycards ?

[fifee]

Chamaco, on Jun 20 2005, 09:16 AM, said:

============================

Set 2



SEQUENCE 5- preemptive overcall

1H-(p)-1S -(3/4m)

Is support double on ?
If so, how do you discriminate the strength of hand with 3 card support (e.g. minimum opener with 3 card support, vs reverse with 3 cd support) ?

How do you set spades trumps without signing off if you are interested in slam and want to set trumps because you only need keycards ?

Support Doubles are usually on through 2♥ only for most partnerships.

If I was interested in setting trumps and investigating for slam, I would cuebid the opponent's suit to tell partner I am interested if they overcall at the 3 level.

If they overcall at the 4 level, then we do our best to overcome the bidding room that was eaten up by the overcall. Depends upon the hand, naturally.

[P_Marlowe]

Hi,

I dont really understand the question, but then,
I dont aim for highest precision, I just want to
survive.
Ask yourself, what would you do, if partner
responded 1NT in standard

Set1
1) ignore the double, with the strong fit variant
responder will make another move
2) ignore the overcall, i.e. if the suit qualifies
and your only bid is 2M bid it, even if it is only a 5
card suit
=> It may help to play 2NT as artificial,
lebensohl style, to differentiate between
a strong opener and a weak one, this will help
you, when opener has a 2 suited hand
Double should probably penalty oriented
3) Pass with minimum, with add. strength bid on, 3S
should be 6 card, you would like to survive on the
3 level in case partner has no fit
Double should probably penalty oriented, a strong NT,
in case you always open your 5 card mayor
4) Double with add. strength, else bid competitive

Set2
You cant, in case you are only interested in Keycards,
bid 4NT, RKBC for spades
Of course the questions remains, why did you not
open stronger?

With kind regards
Marlowe

[han]

Here is what I would play, not claiming that this is best:

Quote

1S-(p)-1NT*-(DBL)

Who plays the double here as strength instead of take-out? Nobody I know, so not worth discussion I think.

Quote

1S-(p)-1NT*-(2m)

double=take-out, typically denying 4 hearts. All other bids natural, 3C over 2D shows both extra and 5-5.

Quote

1S-(p)-1NT*-(3/4m)

Double = take-out, any call besides pass shows serious extras.

Quote

1S-(p)-1NT*-(2H/2NT)

Over 2NT for the minors: Double shows good hand with (presumably) interest in defending. Pass followed by double is penalty. 3m shows strong hand without stopper in the other minor. 3H shows good hand but not forcing (else double first).

Quote

1H-(p)-1S -(3/4m)
Is support double on ?

Over 3m:
You can certainly play this (although most players don't), but then double should not be mandatory but show extras. 3S has a large range, but jump to 4S with weaker hands than normally. 4m should show powerhouse with 4-card support imo.

Over 4m: I would still play the double as take-out (e.g. Qx AQ10xxx x AKJx over 4D), and showing quite a good hand. All bids become rather large ranging.

[Chamaco]

P_Marlowe, on Jun 20 2005, 09:11 PM, said:

Of course the questions remains, why did you not
open stronger?

Because with a 55 2-suiter I open 2C if, and only if I have at least 10 absolutely SURE tricks in hand.
With only 9 sure tricks and a 2-suiter, I will open 1 of a suit, I hate opening 2C with 2 suiters:
second suit is always lost with normal methods, and other more accurate method (a la Chris Ryall) are soldom agreeable quickly with most partners.

Basically, with a 2 suiter, I will try and look for any reason to avoid opening 2C.

Moreover, in the sequence 1H-(p)-1S-(3/4m), if opener is 5431 or 6421 short in their suit and with some 20 hcp and good textures, slam can depend only on RKCB, even if we opened at the 1 level.