IMPs 8-board matches.
South's 1NT was stated to be g14-17 on this hand from today's Chairman's Cup, and partner leads the five of spades, second and fourth, and declarer plays low from dummy. You play the queen, and declarer wins with the king. Now declarer leads the seven of diamonds, and partner plays the three (normal count, no Smith) and dummy plays low, and you win with the king. What do you play next? Partner will be capable of playing the ten on the next round of diamonds from an original holding of Txx, of that you can be sure.