Scoring: IMP
Bidding was: (North was dealer)
P-P-1D-P-1S-X-2C-P-3C-PPP
So, south ended up in a 3C contract on a 4-3 fit.
The play went as follows:
Heart 3 was led. East won with the Q and continued with the K and small heart.
South ruffed with the 3 of clubs and led the diamond K. This was ducked. Declarer led the diamond Q next, won by East. East then shifted to a spade. Declarer won the A and K and continued with the Q. East ruffed, but with the 2! and declarer overruffed with the 6. Declarer then played the AK of clubs and continued spades, maintaining control and making 9 tricks.
What mistake(s), if any, did the defenders make?

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