In this Olympiad special of The Underdog, Robert Ris presents seven remarkable upsets from both the Women’s and Open sections, chosen not only for the rating differences but also for the instructive chess behind them. The examples range from spectacular attacking ideas and sudden tactical reversals to missed winning chances and difficult endgames, showing how quickly a game can turn even when the stronger player appears to be completely in control. One particularly dramatic example sees Arjun Erigaisi lose after dominating much of his game, while another features a rating difference of almost 600 points and a winning material advantage that disappears after a major tactical oversight.