How to Use Suit Preference Signals in Defense

A Suit Preference Signal is an explicit defensive card signal that tells partner which of the two remaining side suits to lead next. Used primarily when giving partner a ruff or when cashing top winners opposite an obvious dummy:

• **Playing a High Card:** Signals a preference for the **higher-ranking** remaining side suit.
• **Playing a Low Card:** Signals a preference for the **lower-ranking** remaining side suit.

Why Suit Preference Signals work

In many defensive situations, attitude signals (I like/dislike this suit) or count signals (I hold even/odd cards) are irrelevant. For example, when you lead a suit for partner to ruff, partner already knows you hold no cards in that suit.

In these obvious situations, the rank of the card you play carries a different message. It directs partner's next lead. A high card points to the higher-ranking side suit, while a low card points to the lower-ranking side suit, removing guesswork from defensive play.

A worked example: Directing a Diamond return

You are defending 4♥. You lead your singleton ♠A.

Dummy (North):

♠ 7 4 2

♥ 8 3 2

♦ A K Q 2

♣ 8 4 2

You (West):

♠ A (Singleton)

Play of the Trick:

You lead the ♠A. Partner drops the ♠K (promising the ♠Q). You lead a second Spade for partner to win. Partner leads a third Spade for you to ruff. Partner plays the ♠10 (a high Spade!) on the third trick.

*Caption:* Partner plays a high Spade (♠10) while giving you the ruff. The two remaining side suits are Diamonds (higher-ranking) and Clubs (lower-ranking). The high card demands a Diamond return to cash your side's setting trick.

Four common mistakes

• Giving a suit preference signal when partner needs an attitude signal to know if a suit is safe.
• Misinterpreting partner's high card as encouragement for the led suit rather than a suit preference signal.
• Playing a middle card when holding a strong preference for a specific side suit.
• Forgetting which two suits represent the "higher" and "lower" side suits in the current layout.

When the rule does not apply

Do not use Suit Preference Signals on standard opening leads where Attitude Signals (showing honours) or Count Signals (showing suit length) are required. Suit preference applies strictly when the led suit outcome is obvious to both defenders.

Key takeaways

• High card = Higher-ranking remaining side suit.
• Low card = Lower-ranking remaining side suit.
• Used when giving partner a ruff or when the led suit situation is obvious.
• Eliminates guesswork on defensive suit switches.