D7 lead (fourth highest) to RHO's 10.
Queen of hearts back, won with the King
Spade to the 9, winning
King of spades taken with the ace
Queen of diamonds (!) ducked (!)
Another diamond(!), ducked to the king (!!!!)
Heart back, won
Club to the Queen and King
Eventually this went 4 off. 400 out. That's 3NT the other way, isn't it?
(declarer can make by winning the second diamond, cashing the spades and the other top heart then exiting in diamonds for a club away from the king)
p.s. we won the match in spite of this board!

Help

1NT (12-14) P 2C P
2D P 3NT all pass