Q 7 6 3
10 8 6
K J 8 6 3
K 7 5
K Q 4 3 2
10 7 5 4
9 6 4
A J 9 5 4 2
A 9 2
A J 10 8 3 2
A 9 7 5
If South is on lead, the defense starts with the ♠ A
a spade. West wins the second or third round of spades, and cashes
the ♥ K
and exits in diamonds, South winning the ace.
South then runs his spades reaching this position:
South has taken six tricks, so when he leads the ♣ Q
East must win, but then has to concede a winner to North's hand.
So perhaps East/West should have killed South's club exit before leading
diamonds? East wins the club shift, cashes the ♥ A
leads the ♦ J
After South runs his spades, this end position is reached:
West has to pitch on the last spade, but if he pitches a diamond, he has to give up a club trick to North at the end, and if he pitches the club, he has to give up a diamond trick to South.
If North/South declare notrump, the ♥ K
is cashed, then a
diamond is led to the jack.
If South ducks this, East cashes his ♥ A
a high heart, setting up his heart suit before the ♣ A
So South must win the diamond. The problem is, that was South's only
entry to his spades, and North's hand is one trick shy to make up for it.
If North/South declare spades, the defense gets two diamonds, a
diamond ruff, two hearts, a club and a spade. The North hand is
made completely irrelevant.