Rather than guessing which singleton to try against four spades, West chose to lay down his heart ace. When East followed with the two (suit preference with a singleton in dummy) and declarer with the jack, West continued hearts, looking to force the dummy. A club ruff could wait and would only provide a third trick anyway, not a fourth.
Declarer ruffed the second heart trick in dummy and unblocked the spade king and queen before playing a club. East flew in with the club ace and accurately returned a heart, giving West trump control for down four.
If declarer needs to come to the diamond ace after taking dummy’s spades, he can next cash the spade ace and then run diamonds. If West ruffs and plays a heart, declarer trumps and plays a club to East, who has no more hearts. If, instead, West discards on all the diamonds, declarer can play a club with a heart ruff for his 10th trick.
It was understandable that declarer decided to play on clubs before releasing the spade ace. Still, assuming East’s spade eight and nine were true cards, only West could have the long spades.
Strangely, West should have shifted to a diamond at trick two. Then, after ruffing a heart and unblocking the top spades, declarer would have been unable to play either a club — that play evolves into what actually happened — or a diamond, where West could maneuver two ruffs.
In the other room, West shifted to a club at trick two, so declarer had 10 tricks painlessly after ruffing a heart and unblocking dummy’s spades.