From the book by Marty Bergen (1985), Better Bidding with Bergen — Volume One, Uncontested Auctions.
4
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
says let’s play in a Part Score 4
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
or 4
![Diamond Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/d.gif)
4
![Diamond Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/d.gif)
is asking opener to bid a singleton: responses are
4
![Heart Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/h.gif)
=
![Heart Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/h.gif)
singleton, 4
![Spade Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/s.gif)
=
![Spade Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/s.gif)
singleton, 4NT=minor suit singleton, and 5
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
no singleton.
Depending on the location of the singleton and your hand, responder is usually interested in playing in a game, 5
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
or 5
![Diamond Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/d.gif)
or a slam, 6
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
or 6
![Diamond Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/d.gif)
.
Example: Responder has:
![Spade Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/s.gif)
A K Q x
![Heart Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/h.gif)
x x
![Diamond Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/d.gif)
A K Q x
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
x x x
With a heart singleton, you want to play in 6
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
otherwise you would bid 5
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
.
4
![Heart Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/h.gif)
and 4
![Spade Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/s.gif)
are signoffs in responders long suit. Opener must pass.
4NT is invitational to slam, asking opener to bid a minor suit slam with an extra trick.
Example: Responder has like
![Spade Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/s.gif)
Q x x
![Heart Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/h.gif)
x x
![Diamond Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/d.gif)
x
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
A K Q J x x x
5
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
asks opener to play in a game, either 5
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
or 5
![Diamond Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/d.gif)
.
5
![Diamond Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/d.gif)
is a signoff by responder, responder knows that the opener has long diamonds and wants to play game from his
side.
6
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
is to play slam in 6
![club suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/c.gif)
or 6
![Diamond Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/d.gif)
, opener is to pick the suit.
Again, a bid of 6
![Diamond Suit](http://youth.worldbridge.org/wp-content/uploads/2017/07/d.gif)
by responder is to play slam in diamonds, responder knows that it is the long suit.
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