Solution doubledummy problem 6

http://doubledummy.net/Problem0006.html

Pick 3 heart tricks down south discarding S A K Q from north.
Then pick 2 dia tricks in north and then play the spade 2.

CASE 1: east plays a small spade.
Then take the spade in south.
Now the hands look like:
South: heart J 8, dia Q 10, club 3 2, spade 3
North: C A K 8 7 6 5 4

case 1 a): west has at most three clubs.
In this case give a club trick to west, then west either gives a trick to south in dia/hearts, or west gives a club trick to north, in either case north wins the remaining club tricks.

case 1 b): west has more than 4 clubs,
this means east has either only one heart, or only one dia.. in either case south wins two dia/heart tricks, south keeps winning until west is left with 3 clubs, at which point south gives one club trick to west and north wins the rest.

CASE 2: east plays the jack of spades.
in this case get one spade trick, one heart trick and one dia trick

Now the hands look like:
South: heart 8, dia 10, club 3 2
North: C A K 8 7
then we win just as in case 1.