Collins Bridge Club
Release 2.19p

You are WEST. You lead the K: 6, 8, and A. Are you ready when declarer leads a low heart?

Thanks to: Mr Bridge and Julian Pottage, Bridge Magazine.

Since you hold the A as well as the 10, you know declarer has no guess and so you can, in fact, take your time.

Can you see the advantage in taking the A at once? Partner's 8 looks like the top of a doubleton (or possibly a singleton). You want to play the Q and a third round of spades while partner has a trump left. Declarer now has to overruff rather than discard a loser. This might beat the contract (as here) or save an overtrick, depending on the precise layout.