1S Defense

[olien]

There is growing popularity in some competitive inversions like as follows:

1D-(1S):

2C 5+H constructive+ strength

2D NAT NF

2H 5+C GF or something

 

I was wondering where I could find more information on this

 

Thanks

[cherdanno]

There is growing popularity in some competitive inversions like as follows:

1D-(1S):

2C 5+H constructive+ strength

2D NAT NF

2H 5+C GF or something

 

I was wondering where I could find more information on this

 

Thanks

I used to play this (with Han and inquiry). It works well whenever

- opponents overcall spades or clubs, and

- there is an unbid major and an unbid minor.

In fact we played it up to the 3-level.

 

I still think it's sound, we just dropped it at the time because we wanted to simplify things.

[gnasher]

A better method, I think, is:

 

2♣ = diamonds

2♦ = hearts, 6 cards any strength or 5 game-forcing

2♥ = hearts, exactly five, exactly invitational

2♠ = clubs

 

Forming good agreements about this sort of thing requires effort, because there are so many different categories of sequence, and lots to discuss about opener's followups.

[rbforster]

The same idea comes up in a lot of places, where putting the other major first is likely more important than a natural forcing minor bid.

 

You could just as easily play this inversion in 2/1 after 1♠ is opened:

 

1♠-?:

2♣ ♥ inv+

2♦ nat GF

2♥ ♣ GF

...

 

or after a weak two by your side:

 

2♠-?:

2N ask

3♣ forcing with ♥

3♦ forcing nat

3♥ forcing with ♣

 

Sorry I dont have more details on the continuations.

[glen]

There is growing popularity in some competitive inversions like as follows:

1D-(1S):

2C    5+H constructive+ strength

2D    NAT NF

2H    5+C GF or something

 

I was wondering where I could find more information on this

See the section Switch Plus in:

 

http://www.ny-bridge.com/bt/add96.html

 

As Granovetter notes about Bergen's Switch:

When Marty published "Switch" in Bridge Today Magazine last year, I thought it would take the tournament world by storm, but it was overlooked by lots of people...

For additional fun at the table, you can rename Switch as Bergen2 when describing it.