When to Finesse Against the Danger Hand
If one defender holds established winners, they are the 'Danger Hand'. You must structure your finesses so that if you lose a trick, you lose it to the safe hand.
In declarer play, the Danger Hand is the specific defender who has the power to defeat your contract if they gain the lead—usually because they hold established winners in the suit that was led at Trick 1. The other defender is the "Safe Hand." When you need to take a finesse to establish your own tricks, you must plan the play so that if your finesse fails, it loses to the Safe Hand, keeping the Danger Hand off lead.
Why avoiding the Danger Hand works
Imagine West leads the ♠K against your 3NT contract. You duck twice, and win the third round with your ♠A. West started with five Spades, so they have two established Spades left. East has none.
West is now the Danger Hand. East is the Safe Hand. If East gains the lead, they cannot play a Spade, and your contract is safe. If West gains the lead, they will cash their Spades and defeat you. When developing your other suits, you must choose lines of play that prevent West from ever winning a trick.
A worked example: Choosing the right finesse
West is the Danger Hand with established Spades. You need to develop Diamonds.
Dummy (North):
♦ A Q 10
Declarer (South):
♦ 5 4 3
Play of the Suit:
You must lead a Diamond from South and insert dummy's ♦10.
Caption: You have a two-way finesse in Diamonds. If you lead the ♦10 from dummy hoping to pin East's ♦J, you might lose to West's ♦K—disaster! West will cash Spades. By leading low from South and finessing the ♦10, if the finesse loses, it loses to East's ♦J. East is the Safe Hand and cannot hurt you.
Four common mistakes
- Taking a finesse out of habit without stopping to identify which defender is dangerous.
- Failing to hold-up on Trick 1 to exhaust the Safe Hand of the Danger Hand's suit.
- Attempting a finesse against the Danger Hand when a safer, slightly lower-percentage play exists that keeps them off lead.
- Forgetting which defender made the opening lead.
When the rule does not apply
If the defenders' suits are completely blocked, or if you are in a suit contract and have drawn all trumps with solid stoppers in every suit, there is no Danger Hand. You can take whatever finesse offers the highest mathematical probability of success.
Key takeaways
- Identify the Danger Hand (usually the opening leader) at Trick 1.
- The Safe Hand has no cards left in the dangerous suit.
- Direct your finesses so they lose to the Safe Hand.
- Willingly sacrifice a trick to the Safe Hand to guarantee your contract.