Practice on Cuebids
Direct practice for this topic is not mapped yet. Use Cuebids scenarios to build hands for this agreement.
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Last updated
2026-07-31
What is a Support Double?
A Support Double lets opener describe responder’s major-suit fit after the opponents interfere. Instead of using double for penalties, opener uses it to show exactly three-card support for responder’s major.
That distinction matters because opener’s direct raise can then be reserved for four-card support or another stronger support action by agreement.
The convention was devised by the American expert Eric Rodwell in the 1970s and is now standard equipment in many tournament partnerships.
Opener shows three spades
- Double by opener shows exactly three-card spade support in support-double methods.
- A direct 2 raise can then show a fuller spade fit by agreement.
Support Redouble
When the opponents double responder’s bid instead of overcalling, the same idea can be handled with redouble. The redouble carries the support message that double would have carried over a natural overcall.
Because it sits directly over a double of a one-level response, the Support Redouble in practice arises only at the one level.
Opener redoubles with three hearts
- Redouble shows exactly three-card heart support in many support-redouble methods.
- The call is about fit clarity first; extra strength can be shown later.
Why Support Doubles help
Responder’s one-level major can be only four cards. After interference, opener needs a compact way to say whether the partnership has partial support or a stronger fit.
Support Doubles create that compact language. Responder can compete more accurately because three-card support and four-card support are no longer blended together.
- Double: exactly three-card support for responder’s major.
- Raise: usually four-card support or better by agreement.
- Pass or another bid: in a mandatory-priority style, denies three-card support; an optional style may suppress the double for a more descriptive call.
Opener denies three-card support
- In a mandatory-priority style, opener’s pass (or any rebid other than double or a raise) denies three spades.
- Responder can now compete or defend without hoping for an eight-card fit that is not there.
Responder decisions
After the support double, responder knows opener has three cards in the major. The next decision is practical: compete, invite, bid game, or look elsewhere based on responder’s own length and strength.
A common scheme keeps the continuations natural.
- Cheapest rebid of the major, 1NT, or a new suit: minimum values, no game interest yet.
- Jump rebid of the major or 2NT: invitational, around 10 to 12 points by a common agreement.
- Cuebid of the overcalled suit: the strong, game-interested continuation.
- Pass: rare, but converts the double to penalty with length and strength in the overcalled suit.
Responder competes with five spades
- Responder knows opener has exactly three spades.
- With five spades and limited values, responder can compete to 2.
Responder invites
- Responder can invite with extra values and five hearts.
- The support double gave responder confidence about the fit.
On and off rules
Support Doubles require a boundary. Without one, opener and responder may disagree about whether a later double is support, penalty, takeout, or just values.
The most common agreement is to play them through two of responder’s suit; some pairs stop lower, for example at 2, so responder can always sign off at the two level. Above the agreed boundary, doubles revert to other meanings.
- Define the highest level where Support Doubles apply.
- Define whether they stay on when the interference is 1NT; many pairs treat that double as penalty or values instead.
- Define whether they apply after responder bids 1 or only after a major response.
- Define whether opener’s Support Double says anything about extra strength.
- Define what opener’s direct raise shows when Support Doubles are available.
Hand examples
The first message is trump length. Opener can be minimum or strong, but the support double itself is not the place to describe the entire hand.
Support double hand
- After 1 - 1 and right-hand opponent overcalls 2, opener doubles to show three spades.
- Opener does not need four-card support to show the fit.
Direct raise hand
- With four spades, opener usually raises directly instead of doubling.
- This lets responder distinguish the stronger trump fit.
Common mistakes
- Using a Support Double with four-card support when a direct raise is the agreement.
- Forgetting whether Support Doubles apply through 2, 2, or higher.
- Treating the double as penalty when the partnership plays support doubles.
- Using support redouble as a general strength redouble without agreement.
FAQ
Does a Support Double show exactly three-card support?
In standard support-double methods, yes. Four-card support is usually shown by a direct raise.
Is a Support Double penalty?
No. When the convention is on, opener’s double is a fit message rather than a penalty attempt.
Does a Support Double promise extra strength?
No. The double only pins down trump length. Opener can hold a bare minimum opening or a much stronger hand, and clarifies strength on the next round.