What Are Defensive Signals in Bridge?

Defensive signals, also called carding, are the messages defenders send each other through the cards they choose to play. The three core signals are attitude (keep leading this suit or switch), count (how many cards you hold), and suit preference (which other suit to return). In standard carding, a high card encourages and a low card discourages.

By Tracey Bauer

If you're newer to bridge, start with How to Play Bridge: The Complete Beginner's Guide, then come back for signals.

Defense is the hardest part of bridge, and it is hard for one simple reason: declarer sees both of their own hands and plays them as a single unit, while each defender sees dummy but never partner's hand. You and your partner are playing blind unless you talk to each other. You cannot speak at the table, but you can signal. Defense is a conversation, and carding is the language. Learn the three signals below and you will stop guessing and start knowing.

Why do defenders need signals?

Every card you play carries two jobs. It tries to win the trick, and it sends a message. Strong partnerships squeeze information out of cards that were never going to win anything. Which heart you play from three small hearts costs you nothing in trick power, but to a partner who is watching, it answers a question: keep going, or get out.

The three questions defenders need answered, over and over, are these. Do you like this suit? How many do you have? What should I play next? Attitude, count, and suit preference answer them in that order.

What is an attitude signal?

When your partner leads a suit, your first card in that suit shows attitude. Playing standard signals, a high spot card says "I like this, continue" and your lowest card says "I have nothing here, consider switching."

Say partner leads the ♥K against 4♠. If you drop a noticeably high heart, you are encouraging: partner can keep playing hearts knowing you have help there. Play your lowest heart and partner knows to look elsewhere. One card, and the defense has a direction.

Two refinements matter. First, signal what you want, not just what you hold. If continuing the suit would hurt the defense, discourage even with an honor. Second, signal with a card you can afford. Never throw a card that might win a trick later just to send a message.

What is a count signal?

When declarer leads a suit, attitude is pointless (nobody "likes" declarer's suit), so your cards show count instead. Standard count: play high-low with an even number of cards, low-high with an odd number.

Count is more powerful than most players realize. It lets partner count the entire hand. Picture dummy with a long, strong suit and no side entry. Your partner holds the ace of that suit and has to decide exactly how long to hold it up. Your count signal answers the question: partner can work out precisely how many cards declarer holds, and take the ace at the exact moment that strands dummy's winners. That is not luck. That is arithmetic, delivered one card at a time.

What is a suit preference signal?

Suit preference is the most elegant signal in bridge. It applies when attitude and count are irrelevant, and instead of talking about the suit being played, it points to a different suit entirely.

The classic case: you lead a suit for partner to ruff. Partner ruffs, and then has to guess how to reach your hand for another ruff. Except partner never has to guess, because the size of the card you led carried the answer. A noticeably high card asks for the higher-ranking of the remaining side suits. A low card asks for the lower-ranking one.

The same logic applies when dummy hits with a singleton in the suit partner led. Attitude is useless (the suit is not continuing) and count rarely matters, so your card becomes suit preference for the switch. Master this and defense becomes a real two-way conversation.

Which signal applies first?

This is where partnerships fall apart, so lock in a priority order. The standard agreement:

1. Attitude when partner leads a suit.
2. Count when declarer or dummy leads a suit.
3. Suit preference when the situation makes attitude and count pointless, such as giving a ruff or facing a singleton in dummy.

The judgment call is reading the situation at trick one, and that skill separates guessing from knowing. Whatever you and your partner agree, write it down. The back of your convention card has a section for exactly this, and your card must match what you play.

Where carding fits in your system

Most of what players call "the system" happens before a single card is played. Stayman and Jacoby Transfers find the right contract after a notrump opening. Takeout Doubles and Negative Doubles let you compete when the opponents get there first. Two Over One gives your responses a framework, and Strong 2♣ handles the giant hands.

Every one of those tools goes quiet the moment the auction ends. Carding is the only system you still have once the opening lead hits the table, and it runs for all thirteen tricks. That is why a partnership that signals well can beat contracts that a stronger pair of bidders lets through.

Common carding mistakes

• Signaling with a card you cannot afford. Information is never worth a trick.
• Sending signals nobody reads. Signals only work if both partners watch the spot cards. Half of carding is observation.
• Telling declarer more than partner. Against a strong declarer, honest count can do more harm than good. Knowing when to go silent is part of the system.
• Having no agreement at all. Standard or upside-down, either works. Playing different systems at the same table does not.

Learn it at the table: the Carding Workshop

Signals click fastest when you watch them work hand by hand. The Carding Workshop is one focused lesson covering attitude, count, and suit preference from first principles to expert judgment, including the exact thought process Tracey uses at the table. It is $10, the replay is included, and every level is welcome.

Want every workshop, every replay, and the private community? The Bridge Unleashed VIP Community brings them together in one place.

Browse everything at bridgeunleashed.com/workshops, and for a daily bidding habit there is 50 Conventions in 50 Days. Once your defense is talking, the next step is learning how declarers fight back, which is the subject of a guide coming later in this series.

Questions players ask about defensive signals

What is carding in bridge?
Carding is the set of agreements defenders use to send information with the cards they play. It covers attitude, count, and suit preference signals plus your opening lead conventions.

What is standard carding?
In standard carding, a high card encourages and a low card discourages, and playing high-low shows an even number of cards. Some partnerships play upside-down attitude and count, which reverses those meanings.

When do I give count instead of attitude?
The usual agreement is attitude when partner leads a suit and count when declarer leads one. Suit preference applies when attitude and count would be pointless, such as when you are giving partner a ruff.

What is a suit preference signal?
A suit preference signal points to a suit other than the one being played. A noticeably high card asks for the higher-ranking of the remaining side suits, and a low card asks for the lower-ranking one.

Do defensive signals go on the convention card?
Yes. The back of the ACBL convention card has a section for your leads and carding agreements, and your card must match what you actually play at the table.