Trump Coup in Bridge: Trump Reduction and the Grand Coup

A trump coup is an ending where you capture a defender's trump honor without leading trumps. The defender sits in front of your tenace, for example his ♠K 8 in front of your ♠A Q, dummy has no trumps left, and near the end dummy leads a side card: the defender has only trumps left, so he must ruff in front of you, and whichever trump he plays, you win both tricks. To get there you first shorten your own trumps to his length by ruffing, which is called a trump reduction. When some of those ruffs are of winners, the play is called a grand coup.

The trump coup is the answer to a common problem: the finesse is right, but dummy has run out of trumps to lead through the king. It is card play, so it is the same in every bidding system.

Here is the ending you are aiming for, with two cards left in each hand:

Dummy leads a diamond. East has only trumps, so he must play one:

• If East plays the ♠8, you overruff with the ♠Q and cash the ♠A, catching the king.
• If East plays the ♠K, you win the ♠A and your ♠Q takes the last trick.

If you were on lead instead, you would have to lead away from ♠A Q and lose a trick to the king. Everything depends on the lead coming from the hand on East's right.

Three conditions make the coup work:

1. Position. The defender's honor sits in front of your tenace. With the tenace in your hand, that is East, your right-hand opponent.
2. Equal length. At the moment of the coup, you have exactly as many trumps as East, and East has nothing but trumps.
3. The lead. Dummy is on lead at that moment.

The hard part is condition 2. You usually start with more trumps than the defender, so you must get rid of your extra trumps by ruffing. Each ruff shortens your trump holding by one.

Take ♠A Q J 10 9 in your hand, ♠5 4 in dummy and ♠K 8 7 6 with East. Two finesses from dummy win with the 9 and the 10. Now you hold ♠A Q J against East's ♠K 8, one trump too many, and dummy has no trump left to lead. So you must ruff once in your hand, ending with ♠A Q against ♠K 8.

Ruffs in your hand need dummy on lead, so count dummy entries before you start:

Four times in this example. Each time you win a trick in your hand, you need a fresh way back to dummy. If dummy does not have that many entries, the coup cannot work, so plan it before you play to trick two.

Often the only cards you can ruff are dummy's winners. Ruffing your own winner looks like throwing a trick away, but it is not: the trick still goes to you (your trump wins it), and the trump you spend is one you could never have cashed anyway, because it would have been stuck behind East's king.

When a trump reduction includes the ruff of a winner, the play is called a grand coup. The name is old and grand, but the idea is the same: shorten your trumps by the number you need, with whatever dummy has to offer.

North-South have 29 HCP and a 5-2 spade fit. 6NT would be the more natural slam, but on this layout it fails: a double dummy solver gives 6NT only 11 tricks. In 6♠, the solver gives 12 tricks against any opening lead. Here is how you take them.

West cashes the ♣A and continues with the ♣10. Dummy plays low and you win with the ♣Q. Now you have lost your one trick, so you need all the rest.

You have plenty of tricks outside trumps: three hearts, two diamonds and the ♣K. The problem is trumps. If East has ♠K x x x, two finesses are not enough: you need a third lead through East, and dummy has only two trumps. So you plan a trump coup from the start.

1. Cash the ♣K now, while East still has a club. If you leave it for later, East can throw his last club and ruff the king with the ♠8.
2. Lead the ♥3 to dummy's ♥A and lead the ♠5. East plays the ♠6 and you finesse the ♠9. West follows.
3. Lead the ♥4 to dummy's ♥K and lead the ♠4. East plays the ♠7, you finesse the ♠10, and West follows with his last trump, the ♠3. East began with ♠K 8 7 6 and still has ♠K 8.
4. You hold ♠A Q J against East's ♠K 8: one trump too many. Lead the ♥5 to dummy's ♥Q. Hearts have split 3-3, so dummy's ♥2 is now a winner.
5. Lead the ♥2 and ruff it with the ♠J. That is the grand coup: you ruff dummy's winner to shorten your trumps. East throws a diamond.
6. Cash the ♦A, then lead the ♦2 to dummy's ♦K. East must follow with his last diamond, the ♦Q.
7. At trick 12 dummy leads a diamond. East has only ♠K 8. Whatever he plays, you win both tricks.

Twelve tricks. The solver confirms each step. Two tempting plays fail by one trick: laying down the ♠A after the two finesses, and discarding on dummy's ♥2 instead of ruffing it.

Think about a trump coup when you see these signs together:

• A finesse you cannot repeat. The finesse is working, but dummy has run out of trumps to lead through the defender.
• A defender with length behind dummy. Typically West shows out on the second or third round and East still holds the honor.
• Spare trumps in your hand. You have more trumps than the defender, so you need ruffs to shorten.
• Entries to dummy. A long suit with winners, or side aces and kings, so dummy can be on lead several times.
• A defender who must follow. By the end, the defender must have only trumps. Count his side suits; you may need to cash winners while he can still follow, as with the ♣K above.

The coup is usually needed when the defender holds K x x x behind dummy's doubleton and you hold A Q J 10 x or similar. The same ending works with other tenaces too, such as your ♠K 10 over East's ♠Q 9 once the ace is gone.

• Cashing the ace too early. Once you lay down the ace, the king is safe.
• Starting too late. Each ruff and each trump lead needs a dummy entry. Plan all of them at trick one, and take the ruffs while the entries are still there.
• Ruffing with the wrong card. Ruff with a card you do not need. Keep the two cards that form the tenace, the ♠A Q above.
• Leaving side winners in your hand. If you still hold a winner that East can ruff when he runs out of that suit, he scores a trump trick. Cash those winners while he follows.
• Forgetting the defender's count. The coup needs East to have nothing but trumps at the end. Count his cards in every suit as the play goes on.

A defender who sees a coup coming can sometimes stop it. He can attack dummy's entries early, before declarer has used them. He can keep a side card he can follow with at the end, so he is never forced to ruff. And when he can ruff a winner of declarer's with a small trump, he often should: that shortens his own trumps at the moment that suits him. Double dummy defenders find all of these, which is why a coup deal needs careful timing.

Trump coups are hard to see in a book and easy to see when you play one. Enter the deal above in BridgeDummy's free double dummy analyzer and play it card by card, or check any position with the double dummy solver.

Related reading: the endplay, the squeeze, the finesse, drawing trumps, counting declarer's tricks, dummy reversal and the crossruff.