[cnszsun]

D.S.I.P=do something intelligent partner.
The basic idea is like this:
In some specific high level competitive bidding,
For example,
1♠-2♥-2♠-4♥
4♠-?
if you are not in forcing pass situation, your double means you have extra offence and ask your partner to make decision basing on his hand; if you have a defence hand, you have to pass.

(Simply to say, you reverse the meaning of double and pass, but i think it should be more complex)

Is this common in expert circle? If you have ever played it, how do you feel?

[FrancesHinden]

If you are not in a forcing pass action, you are not reversing the meaning of double and pass.

Playing double as in a non-forcing-pass auction as "I have extra offence, please do something intelligent" is commonly known (in England at least) as an 'action' double. That is, double means "I want to act here, but I'm not going to bid because that would be unilateral"

The most common auction is something like (1S) 4H (4S) P P x
Other auctions such as

1H 1S 2H P
P 2S P P
3H x

saying "I want to bid 3S, but I'm not going to just in case defending 3Hx is a better spot"

[helene_t]

This is a classical action double. DSIP sounds slightly more penalty-oriented to me but maybe DSIP and action is the same.

There is a new concept, "forward doubles" which I don't quite understand. Sometimes it sounds as if it's like an action double but slightly more take-out oriented, sometimes it sounds as if it's action doubles extended to FP situations or maybe just to situations where it is unclear if pass is forcing or not, or where pass is almost forcing. Also, forward doubles typically occur in fit auctions and action doubles typically in situations where no fit was established, but I don't think those are defining properties.

[cnszsun]

FrancesHinden, on Aug 6 2007, 02:20 AM, said:

Playing double as in a non-forcing-pass auction as "I have extra offence, please do something intelligent" is commonly known (in England at least) as an 'action' double. That is, double means "I want to act here, but I'm not going to bid because that would be unilateral"

Frances's definition about this kind double is exactly what i mean.
But, i'm a little surprised not much reply to this post. I've thought every serious partnership may have discussed about this.

[neilkaz]

Or as is often said, doesn't this double "show cards" ?

[ArtK78]

As I have mentioned in some other threads, this is called a "bridge double." The exact definition is "do something intelligent, partner."

[cnszsun]

neilkaz, on Aug 7 2007, 11:36 AM, said:

Or as is often said, doesn't this double "show cards" ?

Not the same thing, i think.
By default, if no special agreement, i believe your double shows defence interest and trys to stop partner's further competition.
On the other hand, if you play double as what i have suggested, you double becuase you want to compete more, but you don't want to be unilateral, so you ask your partner's opinions.

[kenrexford]

One partner of mine and I used to explain this double an interesting way. The opponents always loved our explanation, which has a slight nuance that is different from the definition provided so far:

"This is an action double. It tells partner, "Partner, do something intelligent. You haven't so far.""