After this revealing auction, flanker leads the King of Diamonds. You play low from dummy, and jammer discards the 3 of Clubs. You win and play trumps, playing a spade to the Ace and the Queen of Spades. On the second round, jammer discards the 5 of Clubs. You continue with a spade to your King and jammer discards the 6 of Clubs. Let's reconstruct their holdings. You know that flanker started with seven diamonds, since you and dummy together hold six and jammer showed out . When you played spades, jammer turned up with only a singleton. So, jammer began this deal with twelve cards in hearts and clubs.