When Not to Overruff

When declarer plays a suit and ruffs it in their own hand, the natural instinct is to overruff if you are sitting behind them with a higher trump. However, expert defenders know that overruffing is sometimes a fatal error. Refusing to overruff—by discarding instead—can trap declarer and guarantee you a trump trick.

Why it works

If you hold a broken sequence of trumps (a tenace like K-J-9), your goal is to keep those cards positioned behind declarer's higher honours. If declarer ruffs a trick with a high trump, and you overruff, you may expose your remaining trumps to being captured. By discarding a loser instead, you force declarer to spend their high trump while your tenace remains intact and lethal.

A worked example: Keeping the tenace

The Contract: 4♠ by South.

Your Hand (West):

♠ K J 9

♥ 7 4 3 2

♦ — (Void)

♣ Q 10 8 6 4 3

6 HCP.

Dummy (North):

♠ 4 3

♥ K Q J 10

♦ 8 7 6 5

♣ A 5 2

South (Declarer) Trumps: ♠ A 10 8 7 6

Dummy is on lead and plays the ♦8. Partner (East) plays the ♦A. Declarer, void in diamonds, ruffs with the ♠10.

You are last to play. Because you are also void in diamonds, you can overruff with the ♠J. But if you do, declarer is left with A-8-7-6, and you are left with K-9. When declarer later plays the Ace, your King will drop. You score exactly one trump trick (the Jack).

Instead, you refuse to overruff and discard a club. Declarer's ♠10 wins the trick, but look at the remaining trumps! Declarer has ♠ A 8 7 6 left. You have ♠ K J 9. You are now guaranteed two trump tricks, because your K-J sits perfectly over their remaining A-8.

Four common mistakes

• Overruffing automatically without considering the trump layout.

• Overruffing with a master trump when a discard would achieve the same result while shedding a loser.

• Refusing to overruff when you hold a master trump that cannot be captured anyway (e.g., the Ace).

• Giving away the trick when partner could have overruffed instead.

When the rule does not apply

If you hold a natural trump trick that cannot be captured, you should usually take your trick. This technique specifically applies when you hold a broken sequence (like K-J-9) that needs to be protected from declarer's remaining high cards.

Key takeaways

• Do not overruff automatically.

• Discarding preserves your trump tenaces.

• Forces declarer to spend their middle honours.

• Often yields an extra trump trick you would have otherwise lost.