Why Defense is the Hardest Part of Bridge
Bridge defense is uniquely difficult because you cannot see partner's hand. Declarer sees 26 cards and makes all the decisions for their side. Defenders see only 13 cards each and must cooperate through limited communication - the cards they play as signals, and the inferences from the auction.
Top players estimate that defense accounts for the largest gap between intermediate and expert play. Improving your defense even slightly will produce immediate results at the table.
Defensive Signals: Communicating with Partner
Attitude signals tell partner whether you like a suit. A high card (like a 7 or 8) is encouraging - you want that suit continued. A low card (2 or 3) is discouraging. When partner leads the ace against a suit contract, your attitude signal tells them whether to continue or switch.
Count signals tell partner how many cards you hold. A high-low sequence (playing the 6, then the 2) shows an even number of cards. Low-high shows an odd number. Use count signals when declarer is running a long suit and partner needs to know when to take their winner.
Second Hand Low, Third Hand High
"Second hand low" means when declarer leads toward dummy, the second player usually plays a low card. This forces declarer to commit a high card from dummy before you commit yours. The idea is to keep your honors positioned over declarer's holdings.
"Third hand high" means the third player (partner of the leader) plays their highest relevant card to try to win the trick or force out declarer's high card. From K-8-3, play the king when partner leads a low card in that suit. But be precise - from K-J-3, play the jack if dummy has small cards, since the king would be wasted.
Counting as a Defender
The most powerful defensive technique is counting. Start with the auction - if declarer opened 1NT (15-17 HCP), you can place missing high cards with reasonable accuracy. Track how many cards each player has in each suit. When declarer shows out of a suit, you know the exact distribution.
Focus on counting one thing at a time. Start with the suit being played. As you improve, expand to tracking the full distribution. Even approximate counting ("declarer started with at least five spades based on the auction") dramatically improves your defense.
When to Lead Trumps
Lead trumps when the auction suggests declarer plans to ruff losers in dummy. Signs include: declarer found a fit at a low level after a simple raise, the opponents bid two suits and chose the cheaper one, or dummy is known to be short in declarer's side suit.
Do not lead trumps from a holding like Q-x-x or J-x-x - you are likely to give declarer a free finesse. A trump lead from small cards (x-x-x or x-x) is much safer.