Kasparov-Karpov: the Secret of the 24th Game

Garry Kasparov and Anatoly Karpov played five matches for the world championship. The fourth match was played in Seville in 1987. After 23 games, the score was 12–11 in Karpov’s favor, putting Kasparov in a must-win situation to retain his title. The final game was adjourned after five hours of play, to be resumed the next day. The sealed position is the subject of this article.