I don’t remember a lot about the movie, it must be old, pre 2000.
I remember a scene where a woman plays a double chess game with two renowned chess champions. She plays the games simultaneously, in two different games, and it’s a trick because she plays the moves of the first champion against the second. So in effect the two champions are playing against each other, via the woman. In the end she ends up winning both games I think (yes, completely unrealistic).
Other details I remember are vague: I think the games took place on a boat cruise. She was helped by a man, her friend, and maybe the movie was about “honorable thieves”, ie the man and the woman are thieves.