Exact(7)
When West discarded a spade on the second round of trumps, declarer put in dummy's nine.
But South played a second round of trumps, ducked to his queen.
But when North led a second round of trumps to his king he was in trouble.
With the actual lie, East discards on the second round of trumps.
Since South had not played a second round of trumps, it looked as if East had the heart ace.
At Trick 5 declarer should have drawn a second round of trumps to give this position: When South leads his remaining spade, West has no answer.
Similar(53)
After winning the first trick, in either hand, South must not lead a second round of trump.
A fourth round of trumps (perhaps by ruffing a third diamond from East) would have trump squeezed West in hearts and clubs.
However, if East had chosen her singleton spade, West could have won the first round of trumps and given her partner a spade ruff.
He wanted to reach his partner's hand, so that East could lead a third round of trumps to stop a club ruff.
If West had discarded differently on the the third round of trumps, South would play the suit that was discarded with similar effect.
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