Bidding and conventions
Negative doubles
Your partner opens, the opponent on your right overcalls, and you hold a decent hand with a four-card major you can no longer bid at the one level. That situation is common enough that nearly every partnership plays a convention for it.
The problem
Partner opens 1♣ and RHO overcalls 1♠. You hold nine points and four hearts. What do you bid?
Nine points, four hearts, four diamonds. Before the overcall you had an easy 1♥. Now you have nothing.
2♥ would promise five hearts and about 10 points. 1NT denies a major and lies about your spade holding. Passing gives up on a hand that might belong in game.
Without an agreement every option misdescribes you, and this comes up constantly, because opponents overcall on roughly half the hands you open.
The solution
Double. It shows the unbid suits, with particular emphasis on any unbid major, and asks partner to pick one.
| West | North | East | South |
|---|---|---|---|
| 1♣ | |||
| 1♠ | Double | Pass | 2♥ |
| Pass | Pass | Pass |
What it promises depends on which suits are still unbid:
- After a 1♠ overcall — exactly four hearts. With five hearts, bid them naturally at the two level.
- After a 1♥ overcall — exactly four spades. With five spades, bid 1♠, which is still available.
- After a minor-suit overcall — both majors, usually four-four.
How strong, and how high
Strength scales with the level, because partner may have to bid at the level you have committed them to:
- Through 2♠: about 6–9 points is enough.
- At the three level: 10+, since partner must bid at the three level or higher.
- At the four level: a genuinely good hand, and a real fit somewhere.
Partnerships also agree how high negative doubles apply. Common agreements are "through 2♠", "through 3♦", or through the four level. Above that limit, a double is penalties again. There is no right answer, but there is a wrong one: not having agreed.
The cost, and the reopening double
Here is the part that gets skipped. If a double of a one-level overcall is takeout, you can no longer double for penalties, and sometimes an opponent overcalls 1♠ into your five spades to the AKJ.
Partner opened 1♣, RHO overcalled 1♠. You would love to double for penalties. You cannot.
What you do instead is pass, and rely on partner to reopen.
Opener, short in the overcalled suit, doubles again — a reopening double, made not because they want to defend but because they know responder may be sitting there with a trap pass. Responder then passes for penalties.
| West | North | East | South |
|---|---|---|---|
| 1♣ | |||
| 1♠ | Pass | Pass | Double |
| Pass | Pass | Pass |
This half is not optional. A partnership that plays negative doubles and does not reopen has given up penalty doubles and got nothing back.
The opponents can then overcall on anything, safe in the knowledge that nobody can punish them. Opener should reopen with a double whenever short in the overcalled suit with no better call.
What opener does after a negative double
Treat it as a takeout double and bid naturally, at a level that shows your strength:
- Minimum (12–15): bid the cheapest sensible suit, or rebid your own.
- Medium (16–18): jump in partner's implied major, or jump-rebid your own suit.
- Maximum (19+): bid game, or cue-bid the opponents' suit to force.
- With length and strength in their suit: pass, converting the double to penalties. Rare, and glorious when it comes off.
The three mistakes
- Doubling with five of the unbid major. Bid it. The double shows exactly four; if partner has three-card support you will play in a 5-3 fit you would otherwise have missed.
- Doubling with no support for the other unbid suit. Partner is entitled to bid it, and you have to have somewhere to go.
- Forgetting to reopen. The single most expensive error in the whole convention, and the least obvious, because the hand it costs you looks like a hand where nothing happened.