[raist]

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?

[P_Marlowe]

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

[ONEferBRID]

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 ) ?

[Jlall]

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).

[whereagles]

I don't use it, but the idea is, in my opinion, superior to standard methods.

[Free]

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).

[jdonn]

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.

[whereagles]

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.