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A typical treatment is that a double up to the level of 4 ♥ is takeout, while doubles on higher levels are for penalties or "cooperative" (i.e. the partner is supposed to pass unless his distribution and/or strength indicates that playing a contract of their own on a higher level is a better prospect).
An immediate cue bid is made directly over opponent's opening bid. Traditionally, it denotes a hand unsuited for a takeout double.For example, after RHO [1] opens 1 ♠, a hand such as ♠ — ♥ AKQ10985 ♦ AQ6 ♣ K85 would prefer not to double for takeout, because partner might make a penalty pass.
To change the effect of a call. For example, passing partner's overcall of 2 ♦ when playing Michaels cue bids converts the overcall from a request to bid a major suit to a contract of 2 ♦. There are many other applications: for example, to pass partner's takeout double is to convert it to a penalty double.
If requested, the explanation of an alert should describe the meaning of the bid completely; for example: "My partner's response of 2 ♥ shows 4-6 HCP. It says nothing whatsoever about distribution, and in particular neither shows nor denies hearts." or "My partner's double of 2 ♠ shows 7-9 HCP. It says nothing whatsoever about distribution ...
The no-trump bids at various levels are not affected by this method of advancing partner's overcalls and retain their normal meaning. The claimed advantage over other treatments is that - thanks to the transfer nature of the various bids - hands with a wider range of strengths can be introduced following partner's overcall.
A natural, or penalty double, is one used to try to gain extra points when the defenders are confident of setting (defeating) the contract. The most common example of a conventional double is the takeout double of a low-level suit bid, implying support for the unbid suits or the unbid major suits and asking partner to choose one of them.
Additionally, when opener makes a call other than a support double (including Pass) when the support double is an option, an Alert should be made if the partnership agreement is that opener's failure to double or to raise denies three-card or longer support for responder's suit (normally, one would expect only four-card or longer support to be ...
A preemptive opening bid, a high-level bid on a weak hand, attempts to make it more difficult for stronger opponents to enter the bidding. Without the Fishbein convention, the usual way to counter it is to double the bid requesting partner to bid his strongest suit (i.e. a takeout double) or to bid notrumps to play.