Tip 1 -   Contract 3 NT by South           (Degree of difficulty = 8)

West leads the Queen of hearts. How should South plan his play?

Tip 2 -   Contract 4 © by South           (Degree of difficulty = 6)

After West overbid 1 spade, N/S plays the contract of 4 © with the Moysian fit (4-3). West leads the Ace, King and Queen of spades. How should South plan his play?

Tip 3 -   Contract 6 © by South           (Degree of difficulty = 5)

West leads the Queen of hearts. How should South plan his play?

Tip 4 -   Contract 4 © by South           (Degree of difficulty = 7)

After West overbid 1 spade, he now leads the King of spades. How should South plan his play?

Tip 5 -   Contract 3 NT by South           (Degree of difficulty = 10)

West leads the 4 of hearts. How should South plan his play?

Tip 6 -   Contract 6 ª by South           (Degree of difficulty = 9 + 3)

West leads the T of diamonds. South tries to take the trick with the Queen of dummy but East overtakes with the King. How should South play to make this contract which is not a sure one?
If you want to gain the an extra 3 points, answer at the following question: what is the probability of making the contract?