4. Facing spade support, your great hand became even better. Opposite as little as xxxx and Ax, you have play for game. Yes, you could make a game try, but how will partner ever know what the right cards are? Let's say you take the high road and bid the game.
You can throw one club on the K, but still have to lose a club trick. You need spades 3-2 to lose only one spade trick. No matter what, you have to lose at least one heart trick.
So, the key is to avoid losing 2 heart tricks.
If hearts are 3-3, it will be easy.
What if they are 4-2?
If you take the AK and play another, you are in danger when you try to trump the 3rd round in dummy. If the opponent who can ruff higher than dummy started with 2 spades, you will go down (he will ruff the 4th round of hearts and his partner will still have a natural trump trick).
If you play the AK first, and then give up a heart, the person who wins it might take out dummy's last trump.
To cater to all possibilities, just duck the first trick (hope hearts aren't 5-1).
Then, you can win any return and take the 2 top spades, then the 2 top hearts and trump a heart in dummy. If an opponent ever trumps in, it is with the natural trump trick. Try it!
The full deal is below:
Anything other than the recommended line leads to down one.
AK653 
K765 
A 
A43.
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