This hand calls for some careful planning especially as the contract is not very good. North’s rebid of 4C is a splinter bid showing a singleton or void in clubs and sufficient values for game. South now expects that the partnership holds 25+hcp in the suits other than clubs and no club loser. That suggests there are plenty values for slam which he bids when the diamond control is clarified. The North hand is just a smidge short of the implied values especially if trumps happen to be 4-1. However, they are 3-2 today and West leads the JS and declarer’s job is to make twelve tricks.
Declarer saw that he needed trumps to be 3-2 and to have some luck in the red suits to make his contract. However, there were real transportation difficulties between the two hands. If the diamond finesse were successful, only one club ruff was needed, but if it were offside, two club ruffs would be necessary. Furthermore, if declarer took a diamond finesse at trick two and it lost he would no longer have the entries to take two club ruffs. So what is your plan?
Declarer then considered what would happen if he gave up on the diamond finesse. The only issue was that while he could ruff two clubs, his only entry back to hand after the second ruff would be with a heart ruff.
After some thought, declarer decided the second approach was more appealing. He took the first trick with queen of trumps, then cashed ace of clubs and ruffed a club. The next card he called for surprised everyone at the table, particularly East: it was dummy’s ten of diamonds. East took this with the queen and exited with a trump. After winning this in hand with the king, declarer ruffed another club. There was only one way back to hand, in hearts, so declarer cashed the aceking of hearts and ruffed a heart. When that passed off successfully, declarer drew the last trump with the ace while throwing dummy’s remaining heart. This left dummy with just the three high diamonds to cash.