[ArcLight]

I've seen some examples of bidding where a certain bid (lets say 3 hearts or 3 spades) is said to be asking for a stopper in that suit. Ive also seen other cases where the same such bid shows a stopper in that suit, and leaves it up to pard whether to try for 3NT or a minor suit game.

Is there a generally used cue bid method to ask for a stopper or was it just one authors system?

[helene_t]

If the opps have shown length/strength in a known suit, bidding that suit asks for a stop (unless it has a different menaing, such as Michaels or constructive raise).

If the opps have shown two suits, a bid in that suit shows a stop. The same may apply in certain situations in which the opps have shown an unknown suit. For example, after opps 2♦ showing either hearts or spades, you can agree that a bid in hearts or spades shows a stop.

A similar principle applies in uncontested auctions. When we have shown two suits, a bid in one of the remaining suit usually shows a stop (if the priority is to look for 3NT). When we have shown three suits, a bid in the fourth suit may ask for a stop.

[Gerben47]

Fairly general is to ask for stopper if there is only one trouble suit and to show a stopper if there are two trouble suits.

Example:

1♦ pass 2♣ (2♠)
3♠ asks a stopper

Rationale: with the stopper you could just bid 3NT.

1NT (2♣ = ♥ + ♠) 2♠ shows a stopper
1♦ pass 2♦* pass 2♠ shows a stopper
* Invitational or better

Rationale: Less likely to be doubled for the lead or for a save.