Here is another deal where it was right to bid directly to four hearts with a very long trump suit. Slow bidders in the South seat allowed East-West to find five diamonds, a contract that makes with an overtrick.
Against four hearts, a spade was led to East, who cashed a second spade and led a third one. South ruffed high and played trumps - lots of them - seven to be exact. How should West think about the hand?
Perhaps this way: "declarer is leading all his trumps and keeping three cards. I need two tricks to defeat him. If my partner has the A, there is no problem. So I will aaume declarer has it and partner hold the K. If partner holds the K, there is also no problem in our getting two tricks. So I will assume he holds the Q and declarer the king."
"Does declarer hold the doubleton K-x, and the singleton A? That would give partner six diamonds and he opened the bidding one spade. No, declarer must hold two diamonds and one club. Therefore I can hold the same, two diamonds and one club, and declarer must go one down."
Bridge Today, Sep-Oct 1992, p. 20