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kaplan interchange what if responder has 5 spades inv?

#1 User is offline   raist 

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Posted 2009-November-26, 05:39

it's become quite fashionable these days to switch the meanings of 1S and 1NT after a 1H opening

1H-1NT = 4+S, F1
1H-1S = 0-3S, F1

my question is
when you play ordinary methods

1H-1S showing 4+ spades, and opener rebids 1NT, responder can "checkback" for 3 spades with 2C/D as appropriate

but if you play the kaplan interchange
1H-1NT showing 4+ spades, and opener rebids some 2m
how do you "checkback" for 3 spades, especially if opener's rebid was 2D?
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#2 User is offline   P_Marlowe 

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Posted 2009-November-26, 05:46

Hi,

a common variant is, that a 1S response to a 1H opening
showes 0-4 spades, a 1NT response showes +5 spades.

See the link to the following page, if I get it right, it is a blog
from inquiry, a regular BBF poster.

http://inquiry2over1.blogspot.com/2005/06/...ied-kaplan.html

With kind regards
Marlowe
With kind regards
Uwe Gebhardt (P_Marlowe)
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#3 User is offline   ONEferBRID 

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Posted 2009-November-26, 05:52

raist, on Nov 26 2009, 06:39 AM, said:

it's become quite fashionable these days to switch the meanings of 1S and 1NT after a 1H opening

1H-1NT = 4+S, F1
1H-1S = 0-3S, F1

my question is
when you play ordinary methods

1H-1S showing 4+ spades, and opener rebids 1NT, responder can "checkback" for 3 spades with 2C/D as appropriate

but if you play the kaplan interchange
1H-1NT showing 4+ spades,  and opener rebids some 2m
how do you "checkback" for 3 spades, especially if opener's rebid was 2D?

I thought:
1H - 1NT = 5+Sp

and
1H - 1S = 0 - 4 Sp

or is that Kaplan Inversion ( aren't they the same thing ) ?
Don Stenmark ( TWOferBRIDGE )
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#4 User is offline   Jlall 

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Posted 2009-November-26, 06:07

Yeah much better to play this as 1N = 5+ spades, 1S=0-4 spades imo. Then play transfers over 1S (1N=bal or clubs, 2C=diamonds, 2D=6+ hearts, 2H=4S, 5H).
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#5 User is offline   whereagles 

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Posted 2009-November-26, 06:55

I don't use it, but the idea is, in my opinion, superior to standard methods.
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#6 User is offline   Free 

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Posted 2009-November-26, 08:13

Jlall, on Nov 26 2009, 01:07 PM, said:

Yeah much better to play this as 1N = 5+ spades, 1S=0-4 spades imo. Then play transfers over 1S (1N=bal or clubs, 2C=diamonds, 2D=6+ hearts, 2H=4S, 5H).

1NT with 5+S is indeed better. But what's the big advantage of using transfers? I can see some small ones (staying low with good hands), but I can also see some big disadvantages, for example, 1NT is 2-way (competing in C to 3-level), and 2H can make it hard on partner if he has a (semi)misfitting hand (you can easily have a 5431 with a 6-3m fit playing 2M).
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#7 User is offline   jdonn 

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Posted 2009-November-26, 10:34

Free, on Nov 26 2009, 09:13 AM, said:

Jlall, on Nov 26 2009, 01:07 PM, said:

Yeah much better to play this as 1N = 5+ spades, 1S=0-4 spades imo. Then play transfers over 1S (1N=bal or clubs, 2C=diamonds, 2D=6+ hearts, 2H=4S, 5H).

1NT with 5+S is indeed better. But what's the big advantage of using transfers? I can see some small ones (staying low with good hands), but I can also see some big disadvantages, for example, 1NT is 2-way (competing in C to 3-level), and 2H can make it hard on partner if he has a (semi)misfitting hand (you can easily have a 5431 with a 6-3m fit playing 2M).

The advantages to using transfers are many.

Minor suit bids promise 4, and you can show 4 spades. If you don't play transfers then you get to show a balanced hand but 2 could be 4513, 2 could be 4531, and 4522 has to bid 1NT.

It's also an advantage that you can do things like transfer to a minor then rebid your major on a decent 6-4 hand.

It's also an advantage that you give yourself more places to play, for example you bid 2 transfer to diamonds and if partner is weak with long clubs he can pass.
Please let me know about any questions or interest or bug reports about GIB.
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#8 User is offline   whereagles 

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Posted 2009-November-26, 12:34

transfers are clearly better :) just that they make

1S 1NT
2x

different than

1H 1S
2x

Other than the extra memory work and loss of mnemonic, transfers are preferrable.
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