West led the ♠J, won by the Ace. A club to the Ace won (West playing the ♣ 9) and ♣8 was continued toward dummy. West showed out so South ducked in dummy and East took his ♣J. The spade return did not do much to harm declarer. He was able to give East a club trick and in time was able to take three spades, two hearts, one diamond, and three clubs for nine tricks.
While the play can go in various ways, it is true that the defense did not go well. There, a basic error was made.
East should let South win the second club trick. East will get the third club trick but with only one remaining entry to dummy, South can't set up and then use dummy's last trick. With diamonds being sour too, a South rate to go down one if the defense doesn't err along with way. He will take three spades, two hearts, one diamond, and only two clubs. By giving declarer an early club trick, the defense stops South from getting two club tricks later on.
Making mistakes is better than faking perfection.
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