Here is a somewhat contrived example of “sure tricks” by George S. Coffin. (Contrived because the bidding is unrealistic given the unbalanced nature of the hands.) It nonetheless gives you an interesting and counterintuitive declarer play puzzle to solve. How are you going to bring home 10 tricks?
South opened the bidding one heart, and West overcalled two clubs. Partner and right-hand opponent both passed. South bid four hearts, ending the auction.
The play started with West cashing the Ace and King of clubs, East discarding a low spade on the second club. At trick three West led the 10 of hearts on which East discarded another spade! Where is that certain 10th trick coming from? Over to you: