North 6 5 A K Q 4 10 9 J 9 7 6 2 West 8 7 4 10 7 5 2 A A K 8 5 4 East Q 10 3 2 -- Q 7 6 5 3 2 Q 10 3 South A K J 9 J 9 8 6 3 K J 8 4 -- The bidding: South West North East 3 4 3 2 South led the 6

It takes a while to teach novices that it is a dreadful mistake to ruff ahead of partner. Once they learn, I have to explain why there are times when ruffing in second position can be vital!

On the heart lead, North's queen was ruffed by East, who switched to a club. This was a critical moment for South. If he followed his instincts of second hand low, East-West would crossruff the hand to death, taking eight tricks for the set.

South recognized the danger, however. Taking no chances, he ruffed the club and led three rounds of spades, removing all trumps. East won the third spade and tried a diamond. After West took the ace, he cashed the ace and king of clubs, dropping his partner's queen. That was five tricks and out; North-South took the remainder. Not only did South save his side's bid with timely intervention, he earned an unexpected set for his side.