The sound comes from Chess.com, the online chess platform where millions of casual players and streamers play daily games, puzzles, and lessons. As chess content grew on YouTube and Twitch, with creators such as GothamChess explaining ideas like promoting to a queen unless it risks stalemate, the short promotion chime became instantly familiar to viewers. Creators now lift it from gameplay to punctuate promotions in edits, memes, and tutorials, because hearing it immediately signals progress, a reward, and a board that has just changed in the player's favour.