It's funny that you mention this because one of my fav fight scenes in any movie is at the beginning of Hero, the 2002 movie with Jet Li. When Jet Li and Donnie Yen's characters face off at the beginning of the movie, they imagine the fight in their heads, with a shift to black&white noting the shift to an imagined fight. Their "simulation" leads to both sides recognizing that Jet Li would win, and Jet Li finishes his opponent off with one swift movement. The scene actually takes place at a chess courtyard, with an old man playing music as they "fight".

Video of the scene: https://www.youtube.com/watch?v=AeeoEpmyb2Y