How to Play a Double Finesse

A Double Finesse (also called a deep finesse) is required when your side holds a tenace missing two important honours—most commonly holding the A-Q-10 and missing both the King and the Jack. To execute it properly, you must assume the cards are placed favourably and take the finesse twice, starting with the lowest card of your tenace.

Why the Double Finesse works

A simple finesse offers a 50% chance of success because you are looking for one specific card. A double finesse offers a 75% chance of establishing at least one extra trick because it works if either or both of the missing honours are favourably placed.

If you hold A-Q-10 in dummy, you must lead low toward the 10 first. If it loses to the Jack, you haven't failed! You simply regain the lead, cross back to your hand, and lead toward the Queen next. You will win two tricks as long as the defender sitting in front of dummy holds either the King or the Jack (or both).

A worked example: Finessing the A-Q-10

You are in 3NT. You need three tricks from the Diamond suit.

Dummy (North):

♦ A Q 10

Declarer (South):

♦ 5 4 3

Play of the Suit:

You lead the ♦3 from South. West plays the ♦2. You insert dummy's ♦10.

Caption: East wins the trick with the ♦J. Do not panic! This was expected. When you get the lead back, you lead the ♦4 from South. West plays the ♦6, and you insert dummy's ♦Q. It wins! East held the K-J, and West held nothing. By finessing the 10 first, you successfully secured two tricks (the Ace and the Queen).

Four common mistakes

• Finessing the Queen first from A-Q-10, entirely wasting the power of the 10.
• Leading the Queen out of your hand toward the Ace-10, giving the defenders an easy cover.
• Failing to recognize you lack the entries required to return to your hand to take the second finesse.
• Giving up on the suit if the first finesse loses to a lower honour.

When the rule does not apply

If you can only afford to lose zero tricks in the suit (for example, in a Grand Slam), taking a double finesse is a guaranteed loser if the honours are split. In such cases, you might be forced to play for a drop or find a different line of play.

Key takeaways

• Used when missing two honours (e.g., holding A-Q-10).
• Lead low toward the lowest card of your tenace first (the 10).
• Requires two outside entries to your hand.
• Succeeds 75% of the time in generating at least one extra trick.