Posted 2010-August-02, 17:01
It's pretty hard for leading a club to break up a minor-suit squeeze. Dummy has the club threat for sure, and declarer has the diamond threat on the auction (dummy can't easily have four diamonds). So even if you remove dummy's club entry on the lead, declarer will have entries both ways in diamonds, and he can pitch clubs from dummy while he cashes major-suit winners. In the unlikely event that all the diamond winners are in declarer's hand, dummy is likely to have the ace of spades as an entry after cashing hearts.
More plausible is a double squeeze around spades, which will be broken up only by a spade lead; presuming on the auction that partner's spades are any good at all, this won't blow a spade trick. If, unlikely as it may seem, partner guards diamonds as well and declarer still has 12 tricks (AKQx opposite stiff, or Axx opposite Kxx with seven heart tricks), declarer has a compound squeeze available and again a spade is the only way to break it up.
In real life, though, I lead a lazy heart. Partner's gutsy 7♠ save at these colors suggests he may have some stuff outside spades (how else can he expect to take eight tricks?), in which case they won't have enough tricks unless I blow some suit or other, and the singleton heart is the one card guaranteed never to give away a trick in its own suit. It's the "only one suit will beat it" clue that makes me realize that (a) a spade might be necessary, and (b) think harder about how unlikely it is that a spade will cost a trick.
I like your lazy leads better than mine.