After South opened TWO SPADES, some E-Ws got to FIVE CLUBS as at our table,
there was no problem to the play, club queen sitting nicely.
I wondered if FOUR HEARTS might not be the better matchpoint score for East West, and was
in fact, a little smug. But we got only 33% for -400. Do you see what happened?
When south leads his singleton diamond, only a few declarers cleared trumps with HA, HK and another.
Most finessed, and now south put in partner with the Spade Ace and they got a D ruff to go with their three tricks.