Exercise No1 - Answer

• teams. South certainly will not risk his contract, so will not finesse: 3NT + 2.
• matchpoints. Now finessing is a logical alternative: 3NT - 3. L16C2

In both cases the TD tells south that he has to play a legal card and west that he may play a different card. Furthermore he tells south that the knowledge of ¨10 being at west is UI if coming from seeing that card. (Don't tell south that he has to play ¨9!)