Intermediate and newcomer players - sharpen your game with this series of tutorials. You can browse the index by topic, or read them in order. Learn even more at ACBL's Learn page.
Here’s a neat deception, but, alas, it won’t work against modern signaling methods. You are West, defending 3NT after this auction:
South West North East
1NT Pass 2♣ Pass
2♦ Pass 3NT Pass
Against 3NT you lead your 4th-best Spade. East’s Jack is taken by Declarer’s Queen, then a Diamond to Dummy's Queen, and the losing Club finesse to your King. How do you plan to beat this contract?