The worst game in world championship history Topalov vs Kramnik, 2006  (D18) Queen's Gambit Declined Slav, Dutch, 63 moves, 0-1 The worst blunder by a reigning world champion Deep Fritz vs Kramnik, 2006  (D20) Queen's Gambit Accepted, 35 moves, 1-0 Grandmaster resigns in a won position K Darga vs Lengyel, 1964  (A17) English, 41 moves, 0-1 Trying to win a dead-drawn game Spassky vs Fischer, 1972  (E56) Nimzo-Indian, 4.e3, Main line with 7...Nc6, 56 moves, 1-0 Forgetting the setup on the board L Palau vs S Kalabar, 1927  (E11) Bogo-Indian Defense, 5 moves, 1-0 Getting mated in five moves F B Arnold vs M L Hanauer, 1936  (A51) Budapest Gambit, 5 moves, 0-1 Losing the Queen in eight moves P Frazer vs Taubenhaus, 1888  (C45) Scotch Game, 8 moves, 1-0 Moving the King into the way Carlsen vs Shirov, 2008  (C78) Ruy Lopez, 80 moves, 1-0 Book blunder Fischer vs Reshevsky, 1958  (B32) Sicilian, 42 moves, 1-0 Underestimating the kid Kasparov vs Radjabov, 2003  (C11) French, 39 moves, 0-1 The effects of being demoralized Capablanca vs Tarrasch, 1914  (C49) Four Knights, 83 moves, 0-1 Blundering out of the book Fischer vs Spassky, 1992  (C69) Ruy Lopez, Exchange, Gligoric Variation, 21 moves, 1-0 Blunder-full key game Kramnik vs Topalov, 2005  (B80) Sicilian, Scheveningen, 34 moves, 0-1 Hanging the Queen Petrosian vs Bronstein, 1956  (E66) King's Indian, Fianchetto, Yugoslav Panno, 36 moves, 0-1 Allowing an endgame mate in the middle of the board Keres vs Fischer, 1959  (B99) Sicilian, Najdorf, 7...Be7 Main line, 53 moves, 0-1 A nail in a beautiful coffin B Larsen vs Fischer, 1971  (A30) English, Symmetrical, 54 moves, 0-1 Too many cooks spoil the broth Taimanov vs Fischer, 1971  (D80) Grunfeld, 47 moves, 0-1 Endgame see-saw Karpov vs Kavalek, 1974  (A30) English, Symmetrical, 45 moves, 1-0 Combination artist botches endgame Spielmann vs Duras, 1907  (C54) Giuoco Piano, 99 moves, 0-1 Bad start for a future world champion Kotov vs Petrosian, 1949  (D35) Queen's Gambit Declined, 13 moves, 1-0 Mistake in shock Fischer vs Reshevsky, 1967  (C93) Ruy Lopez, Closed, Smyslov Defense, 46 moves, 1-0 Shortest loss by a world champion A Zapata vs Anand, 1988  (C42) Petrov Defense, 6 moves, 1-0 Losing a shot at the world championship Benko vs Keres, 1962  (A07) King's Indian Attack, 47 moves, 1-0 Incredible Rook Blunder Mamedyarov vs S Zagrebelny, 2004  (B90) Sicilian, Najdorf, 40 moves, 1-0 Grandmaster plays ONLY move that allows an instant mate A Beliavsky vs L E Johannessen, 2002  (D58) Queen's Gambit Declined, Tartakower (Makagonov-Bondarevsky) Syst, 69 moves, 0-1 Back-to-Back Blunders by Boy Wonders Radjabov vs Carlsen, 2008  (B77) Sicilian, Dragon, Yugoslav Attack, 40 moves, 0-1 Yet ANOTHER Top Grandmaster Simply Hangs His Queen Bacrot vs E Inarkiev, 2008  (C69) Ruy Lopez, Exchange, Gligoric Variation, 23 moves, 0-1 27 games