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mfa1010, on 2012-April-16, 14:40, said:
There is indeed a squeeze (a double guard squeeze?) to 13 tricks, if declarer reads the end position.
Declarer discards the small spades and ♥9 on the clubs. West must keep all his diamonds and at least ♥J to avoid a finesse in hearts.
After the clubs, ♦K, diamond finesse, ♠A, west is therefore out of spades and has only one heart left. ♦A then kills east in the majors T11.
The best west can do is to throw all his hearts to keep a spade guard. Declarer then has to play heart to his 8 to make all the tricks, and that would fail if west had started with five hearts.
Declarer discards the small spades and ♥9 on the clubs. West must keep all his diamonds and at least ♥J to avoid a finesse in hearts.
After the clubs, ♦K, diamond finesse, ♠A, west is therefore out of spades and has only one heart left. ♦A then kills east in the majors T11.
The best west can do is to throw all his hearts to keep a spade guard. Declarer then has to play heart to his 8 to make all the tricks, and that would fail if west had started with five hearts.
Best thing about this line is that you can play ♦k + ♦J early and it still succeeds.