How to Lead Fourth-Best Against No-Trumps

Against a No-Trump contract, your standard opening lead is the fourth-highest card from your longest and strongest suit, provided you do not hold a solid sequence of three top honour cards (such as K-Q-J or Q-J-10). Leading fourth-best attacks declarer's stoppers early while giving your partner the exact information needed to calculate missing cards using the Rule of 11. If your long suit lacks high honour cards, you should still lead fourth-best to establish long-card winners.

Why fourth-best leads work in No-Trump defense

No-Trump contracts are a race between declarer and defenders to establish and cash long suits. Because there is no trump suit to stop high cards, the side that establishes its long suit first usually wins the contract.

Leading fourth-best accomplishes two vital defensive goals. First, it targets your side's best long-suit asset. Second, the specific rank of the card you lead tells partner how many cards you hold in the suit and allows partner to apply the Rule of 11 (subtracting the rank of your lead card from 11 to calculate how many higher cards are held by dummy, partner, and declarer combined).

A worked example: Applying fourth-best and the Rule of 11

You are sitting West on defense against South's 3NT contract.

Your Hand (West):
♠ K J 8 5 2
♥ 9 4
♦ Q 10 3
♣ 7 2

Play of the Trick: You select your longest suit (Spades) and lead your fourth-highest card: the ♠5.

Dummy (North) shows: ♠ Q 6 3
Partner (East) holds: ♠ A 10 4

Partner applies the Rule of 11: 11 minus 5 equals 6 higher cards in the non-leader hands. Partner sees two higher cards in dummy (♠Q, ♠6) and two in their own hand (♠A, ♠10). Since 2 + 2 = 4, partner knows declarer holds exactly two cards higher than the 5 (the ♠9 and ♠7). Partner knows declarer does not hold the ♠K or ♠J, making your lead completely transparent.

Four common mistakes

• Leading a low card from a short three-card suit instead of leading from your longest suit.
• Leading fourth-best when you hold a solid honour sequence like Q-J-10-4 (always lead the top of a sequence, the Queen).
• Leading fourth-best from an interior sequence like K-J-10-5 (lead the Jack, the top of the interior sequence, instead).
• Switching suits on Trick 2 before driving out declarer's remaining stoppers in your led suit.

When the rule does not apply

Do not lead fourth-best if partner bid a suit during the auction; you should usually lead partner's suit instead. Additionally, if you hold a sequence of three touching honour cards (e.g., K-Q-J-2 or J-10-9-5), lead the top card of the sequence rather than fourth-best.

Key takeaways

• Lead the 4th highest card from your longest and strongest suit against No-Trump.
• Allows partner to calculate missing high cards using the Rule of 11.
• Establishes low-card tricks in your long suit once declarer's stoppers are gone.
• Always lead top of a sequence (e.g., King from K-Q-J) rather than fourth-best.