Chess Battle Advanced is the name of a remake of Chess Evolved Online, an online chess game that CBA’s creator thought was P2W, or pay-to-win. It got scrapped in development, and Icely Puzzles, a puzzle game YouTuber, mutated it into a meme. He’s used it as a running gag, such as in “Why is Everything Keke?” where “Keke Battle Advanced” appears, and in his cursed Tetris variants video, at the end is “Tetris Battle Advanced.”