Another example of a singleton king

Here’s another great comment by Oscar Wilde: “I am so clever that sometimes I don’t understand a single word of what I am saying.” Recently, I have had a few deals in which a player has bid no-trump with a singleton king, mentally picturing it as king-doubleton. Here is another. What happened in four hearts after West led the club 10? When South showed a balanced 22 to 24 points, North used Stayman to find the heart fit. (If South had denied a four-card major by bidding three diamonds, North would have continued with three hearts, the recommended Smolen convention showing five spades and four hearts.) Four spades is preferable to four hearts, until you look at the East-West hands. The defence against four spades would probably go: heart to the ace, heart ruff, club to the ace, heart ruff and diamond ace for down two. A similar defence could have defeated four hearts if West had guessed to lead a spade; but that was tough to find. At the table, after the club-10 lead, East, worried that South had king-third of clubs, played low. Declarer happily scooped up the trick and attacked trumps. East won the first round and tried to cash the club ace, but South ruffed high, played his heart king to see the bad break, then drove out the diamond ace. When West returned a diamond, declarer won, drew trumps and claimed an overtrick. East should have taken the first trick, then shifted to his spade, which would have given the defenders one club, one heart, one diamond and a spade ruff.