World Championship Game #1 Petrosian vs Botvinnik, 1963  (E34) Nimzo-Indian, Classical, Noa Variation, 40 moves, 0-1 World Championship Game #2 Botvinnik vs Petrosian, 1963  (D27) Queen's Gambit Accepted, Classical, 35 moves, 1/2-1/2 World Championship Game #3 Petrosian vs Botvinnik, 1963  (E17) Queen's Indian, 86 moves, 1/2-1/2 World Championship Game #4 Botvinnik vs Petrosian, 1963  (A35) English, Symmetrical, 24 moves, 1/2-1/2 World Championship Game #5 Petrosian vs Botvinnik, 1963  (D94) Grunfeld, 48 moves, 1-0 World Championship Game #6 Botvinnik vs Petrosian, 1963  (D27) Queen's Gambit Accepted, Classical, 27 moves, 1/2-1/2 World Championship Game #7 Petrosian vs Botvinnik, 1963  (A21) English, 52 moves, 1-0 World Championship Game #8 Botvinnik vs Petrosian, 1963  (D27) Queen's Gambit Accepted, Classical, 55 moves, 1/2-1/2 World Championship Game #9 Petrosian vs Botvinnik, 1963  (E08) Catalan, Closed, 55 moves, 1/2-1/2 World Championship Game #10 Botvinnik vs Petrosian, 1963  (D27) Queen's Gambit Accepted, Classical, 43 moves, 1/2-1/2 World Championship Game #11 Petrosian vs Botvinnik, 1963  (D32) Queen's Gambit Declined, Tarrasch, 41 moves, 1/2-1/2 World Championship Game #12 Botvinnik vs Petrosian, 1963  (D31) Queen's Gambit Declined, 53 moves, 1/2-1/2 World Championship Game #13 Petrosian vs Botvinnik, 1963  (E17) Queen's Indian, 54 moves, 1/2-1/2 World Championship Game #14 Botvinnik vs Petrosian, 1963  (D31) Queen's Gambit Declined, 57 moves, 1-0 World Championship Game #15 Petrosian vs Botvinnik, 1963  (D81) Grunfeld, Russian Variation, 58 moves, 1-0 World Championship Game #16 Botvinnik vs Petrosian, 1963  (D27) Queen's Gambit Accepted, Classical, 54 moves, 1/2-1/2 World Championship Game #17 Petrosian vs Botvinnik, 1963  (E14) Queen's Indian, 39 moves, 1/2-1/2 World Championship Game #18 Botvinnik vs Petrosian, 1963  (D31) Queen's Gambit Declined, 61 moves, 0-1 World Championship Game #19 Petrosian vs Botvinnik, 1963  (E19) Queen's Indian, Old Main line, 9.Qxc3, 66 moves, 1-0 World Championship Game #20 Botvinnik vs Petrosian, 1963  (D27) Queen's Gambit Accepted, Classical, 21 moves, 1/2-1/2 World Championship Game #21 Petrosian vs Botvinnik, 1963  (A15) English, 10 moves, 1/2-1/2 World Championship Game #22 Botvinnik vs Petrosian, 1963  (D23) Queen's Gambit Accepted, 10 moves, 1/2-1/2 22 games