Deductive Reasoning

“Deduce” is not de lowest card in de deck. Clues from the bidding and defense — and they are always available — can help declarer deduce a winning play.
Against 3NT, West led the ♠2: three, jack, king. Declarer next took the ♣A K. When West threw a diamond, declarer continued with the K Q and a third heart to dummy’s ace. This time East pitched a spade, so South led a club to his 10 and cashed the ace. At the ninth trick he led a diamond to dummy’s king, but East won and the defense had the rest.
Down one.

Dlr: South ♠ 8 7 3
Vul: N-S A 10 4 2
K 6 5
♣ 7 5 2
♠ A Q 6 2 ♠ J 9 4
J 7 6 5 9 8
Q 9 7 2 A 10 4
♣ 3 ♣ J 9 8 6 4
♠ K 10 5
K Q 3
J 8 3
♣ A K Q 10
 South West North East 1♣ Pass 1♥ Pass 2NT Pass 3NT All Pass

South could deduce from the deuce: West’s opening lead. The ♠2 suggests a four-card holding. South also knows West had one club. But if West had a five-card diamond suit, he would have led that suit — the other unbid suit — against 3NT.
South should play West for 4-4-4-1 distribution. After South takes the K Q, he should lead a heart to dummy’s 10. He wins four hearts, four clubs and a spade.

Daily Question

You hold:
♠ A Q 6 2
J 7 6 5
Q 9 7 2
♣ 3
Your partner opens 1, you respond 1 and he bids 1♠. What do you say?