The Leonardo Code

Puzzle. Find out the opponent's code before he finds out yours!

A puzzle based on the board game "Da Vinci Code" (Coda). Find out the opponent's code before he finds out yours. Use common sense, intuition and "detective" skills. You will have to fight with the computer. He plays fair and will not peek at your cards. But at the same time he is smart and does not allow superfluous mistakes. Can you beat?