doubleton

It was just possible that West had 2=2=6=3 shape with three low clubs, but then East, with only a doubleton diamond, might have considered shifting at Trick 2.

Now South, hoping East had started with doubletons in both minors, led his diamond queen and discarded dummy’s remaining heart.

Declarer needed the doubleton queen-jack of hearts, the diamond queen onside and the queen dropping.

East, worried that his partner had the eight-four doubleton, put in his ten.

So declarer decided that East’s plays had been restricted by his having only a doubleton.