You are in 3NT. Scoring is matchpoints. East leads the King of diamonds and when you duck that, he continues with the queen of diamonds, west discarding a heart.
How do you continue?
I didn't see any squeeze, since East can save his diamond winner and West his heart winner. So, I claimed 11 tricks. Next hand!
Not so fast. It turned out to be quite a bad board because declarers who played it out often got West to misdefend. East tried to keep his heart honor guarded and let go his diamond winner, setting up declarer's diamond 8. Playing against a disparate field, anything is better than conceding. Play it out.