Playing online with a regular partner in a matchpoints tourney, we defend 4H (click on "Next" to follow along):
Partner led a heart and declarer took two rounds of hearts, a diamond and two more hearts. I discard a club (easy) on the third heart. On the fourth heart, what do you discard?
Diamond or spade? Dummy has four cards in both. I threw away a diamond and it was Too Late Now. Dummy's fourth diamond was good and he could discard a loser on it. 4H+1 was a top board for them. Most of the field was in 4H making.
From the bidding (he didn't sit for 3NT), partner has the Ace of spades. Declarer probably has 3 cards in each minor since with four, he would have bid 6-4-6. I need to discard spades and protect the diamond Jack.