World Championship Game #1 Spassky vs Petrosian, 1969  (B42) Sicilian, Kan, 56 moves, 0-1 World Championship Game #2 Petrosian vs Spassky, 1969  (D34) Queen's Gambit Declined, Tarrasch, 61 moves, 1/2-1/2 World Championship Game #3 Spassky vs Petrosian, 1969  (B36) Sicilian, Accelerated Fianchetto, 43 moves, 1/2-1/2 World Championship Game #4 Petrosian vs Spassky, 1969  (D34) Queen's Gambit Declined, Tarrasch, 41 moves, 0-1 World Championship Game #5 Spassky vs Petrosian, 1969  (D41) Queen's Gambit Declined, Semi-Tarrasch, 30 moves, 1-0 World Championship Game #6 Petrosian vs Spassky, 1969  (D31) Queen's Gambit Declined, 47 moves, 1/2-1/2 World Championship Game #7 Spassky vs Petrosian, 1969  (D18) Queen's Gambit Declined Slav, Dutch, 27 moves, 1/2-1/2 World Championship Game #8 Petrosian vs Spassky, 1969  (D37) Queen's Gambit Declined, 44 moves, 0-1 World Championship Game #9 Spassky vs Petrosian, 1969  (A56) Benoni Defense, 65 moves, 1/2-1/2 World Championship Game #10 Petrosian vs Spassky, 1969  (E47) Nimzo-Indian, 4.e3 O-O 5.Bd3, 38 moves, 1-0 World Championship Game #11 Spassky vs Petrosian, 1969  (E12) Queen's Indian, 56 moves, 0-1 World Championship Game #12 Petrosian vs Spassky, 1969  (D34) Queen's Gambit Declined, Tarrasch, 49 moves, 1/2-1/2 World Championship Game #13 Spassky vs Petrosian, 1969  (C42) Petrov Defense, 25 moves, 1/2-1/2 World Championship Game #14 Petrosian vs Spassky, 1969  (D30) Queen's Gambit Declined, 56 moves, 1/2-1/2 World Championship Game #15 Spassky vs Petrosian, 1969  (C42) Petrov Defense, 19 moves, 1/2-1/2 World Championship Game #16 Petrosian vs Spassky, 1969  (D34) Queen's Gambit Declined, Tarrasch, 31 moves, 1/2-1/2 World Championship Game #17 Spassky vs Petrosian, 1969  (B42) Sicilian, Kan, 58 moves, 1-0 World Championship Game #18 Petrosian vs Spassky, 1969  (D34) Queen's Gambit Declined, Tarrasch, 59 moves, 1/2-1/2 World Championship Game #19 Spassky vs Petrosian, 1969  (B94) Sicilian, Najdorf, 24 moves, 1-0 World Championship Game #20 Petrosian vs Spassky, 1969  (D55) Queen's Gambit Declined, 50 moves, 1-0 World Championship Game #21 Spassky vs Petrosian, 1969  (C92) Ruy Lopez, Closed, 53 moves, 1-0 World Championship Game #22 Petrosian vs Spassky, 1969  (D55) Queen's Gambit Declined, 31 moves, 1/2-1/2 World Championship Game #23 Spassky vs Petrosian, 1969  (B48) Sicilian, Taimanov Variation, 41 moves, 1/2-1/2 23 games