East opened 1♠. South, needing some action, overcalled 1NT, and the end contract was 3NT.
West elects a fourth-best diamond, East's Jack taken by South's King. The diamond 10 is then floated and won. A small spade is then won by East's King, and the heart Queen is returned, won by Declarer.
A second spade to dummy is ducked by East.
Here things get interesting. Whether this is the right play, or not, the next play was diamond Ace and out, West winning and leading back a club.
North now holds ♠-- ♥xxx ♦9 ♣x. South holds ♠J9 ♥A ♦xx ♣QJ. East holds ♠Ax ♥x ♦-- ♣Kx.
On the last diamond:
If East throws a club, South throws a club. South will take one heart and will establish one spade in the end position.
If East throws a spade, South throws a spade. South will take one heart and will establish one club in the end position.
If East throws his seemingly useless heart, South pitches his heart winner, reducing his winner count, but eventually establishes two black winners in the end position.
This line gains whenever things are as they seem. However, if West actually has the club King, strangely, then the defense can accomplish a strange win on the board. West must first give South a "free finesse" that he cannot take. East must then pitch his heart and save worthless clubs to induce the pattern squeeze on South.

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