I can't be the only one to consider Victor Mollo's classic Bridge in the Menagerie as the most entertaining bridge book ever written. When I reread the book a couple of years ago, I was surprised when I reached this deal, from the chapter "Leprechauns v. Gremlins (II)".
North dealer, East-West vulnerable
|Q J 10 9 8 7 6|
|Q 10 9 8 7 6|
|A 6 5 4 3 2||Q J 10 9 8 7|
|–||K 5 4|
|K Q J 5 4 3 2||–|
|–||K J 5 4|
|A 3 2|
|A 10 9 8 7 6|
|A 3 2|
The king of spades happenes to be the only lead to defeat 7 spades, but not for the reason Mollo supplies. Why not?
If South leads the ace of hearts, East's king will be established, and the king of clubs falls on the third club ruff. Then, eleven trump tricks are enough, so East can draw trumps early. And the same is true if South leads a low heart (East discards a diamond from dummy).
If South leads the ace of diamonds, East has more tricks than he needs; and if South leads a low diamond, East can indeed play on a complete cross ruff, but it's just as good to simply draw trumps and establish the king of clubs with three ruffs.
If South leads the ace of clubs, East's king will be established, but it is impossible to win "twelve more on a complete cross ruff". Why? Because the first ruff was in dummy. That means the twelfth ruff will be in East's own hand, and even if South has to follow with the king of spades to that trick it won't "fall under dummy's ace", it will beat declarer's queen.
From this you may think that the slam is defeated on the ace of clubs lead (I thought so myself first), but it isn't so. 7 spades will succeed even on the ace of clubs lead, since South can be squeeezed in three suits (one of them being trumps). This is how:
East ruffs the opening lead, ruffs a diamond, cashes the king of clubs and cross ruffs six more tricks (two hearts and one club in dummy; three more diamonds in hand), to reach this end position:
|A 6||Q J|
On the club jack, South is squeezed(!) If he throws a diamond, East can ruff away the diamond ace and draw trumps; if he discards the heart ace, East can draw trumps and cash the heart king; and if he ruffs, it will be a complete cross ruff after all.
But if South's opening lead is the king of spades, East can only win twelve tricks. The reason that this lead is killing is not that it stops a complete cross ruff (that was only possible on a low diamond lead, and even then it wasn't necessary) but that it breaks up the squeeze against South by forcing East to draw the trump round too early.
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