chessflex
Moscow · Apr 1969
Spassky 12½–10½ Petrosian
Spassky won 12½–10½.
The score gap, game by game: up is Spassky.
The move that cost the match's loser the most, in a game they lost.
Spassky v Petrosian · 1–0
23... exd4 by Petrosian: chances 74% → 43%
The coach: Nf4 instead (the arrow) — with it, Petrosian was clearly better.
Replay it: Study › Follow a live game › World Championship 1969: Spassky v Petrosian › Game 19
Each line is White's chances move by move, as the coach saw them; above the middle, White is better. The mark is the costliest move.
56 moves · e4 c5 Nf3 e6 · accuracy Spassky 91.9, Petrosian 94.5
Costliest move: 46. g5+ (Spassky, 20% → 4%)
61 moves · c4 e6 d4 d5 · accuracy Petrosian 92.8, Spassky 93.2
Costliest move: 15. N5d4 (Petrosian, 59% → 44%)
43 moves · e4 c5 Nf3 Nc6 · accuracy Spassky 95.2, Petrosian 94.0
No move cost more than 12%.
41 moves · c4 e6 d4 d5 · accuracy Petrosian 88.6, Spassky 91.9
Costliest move: 40. Ne3 (Petrosian, 22% → 3%)
30 moves · c4 Nf6 Nc3 e6 · accuracy Spassky 94.4, Petrosian 91.1
Costliest move: 19... Qc2 (Petrosian, 37% → 22%)
47 moves · c4 e6 d4 d5 · accuracy Petrosian 95.5, Spassky 95.6
No move cost more than 12%.
27 moves · d4 d5 c4 c6 · accuracy Spassky 94.2, Petrosian 92.3
No move cost more than 12%.
44 moves · c4 e6 d4 d5 · accuracy Petrosian 92.4, Spassky 94.8
Costliest move: 40. Nc6 (Petrosian, 16% → 2%)
65 moves · d4 Nf6 c4 c5 · accuracy Spassky 91.9, Petrosian 91.1
Costliest move: 29... Rxf3 (Petrosian, 51% → 37%)
38 moves · d4 Nf6 c4 e6 · accuracy Petrosian 94.5, Spassky 92.7
No move cost more than 12%.
56 moves · d4 Nf6 c4 e6 · accuracy Spassky 89.5, Petrosian 92.5
Costliest move: 39. Ra2 (Spassky, 49% → 30%)
49 moves · c4 e6 d4 d5 · accuracy Petrosian 93.4, Spassky 94.0
No move cost more than 12%.
25 moves · e4 e5 Nf3 Nf6 · accuracy Spassky 93.8, Petrosian 95.0
No move cost more than 12%.
56 moves · c4 e6 d4 d5 · accuracy Petrosian 90.9, Spassky 91.6
Costliest move: 47... h5 (Spassky, 48% → 25%)
19 moves · e4 e5 Nf3 Nf6 · accuracy Spassky 95.6, Petrosian 95.4
No move cost more than 12%.
31 moves · c4 e6 d4 d5 · accuracy Petrosian 94.1, Spassky 94.3
No move cost more than 12%.
58 moves · e4 c5 Nf3 e6 · accuracy Spassky 92.7, Petrosian 90.7
Costliest move: 49... Bxa5 (Petrosian, 26% → 6%)
59 moves · c4 e6 d4 d5 · accuracy Petrosian 91.6, Spassky 92.6
Costliest move: 59. Rd6 (Petrosian, 50% → 36%)
24 moves · e4 c5 Nf3 d6 · accuracy Spassky 88.1, Petrosian 87.3
Costliest move: 23... exd4 (Petrosian, 74% → 43%)
50 moves · c4 e6 d4 d5 · accuracy Petrosian 90.3, Spassky 90.9
Costliest move: 48. Rc5 (Petrosian, 87% → 68%)
53 moves · e4 e5 Nf3 Nc6 · accuracy Spassky 95.4, Petrosian 92.5
Costliest move: 52... Be1 (Petrosian, 13% → 0%)
31 moves · c4 e6 d4 d5 · accuracy Petrosian 92.4, Spassky 92.7
No move cost more than 12%.
41 moves · e4 c5 Nf3 Nc6 · accuracy Spassky 92.4, Petrosian 89.3
Costliest move: 39... Ra7 (Petrosian, 23% → 9%)
Every game of this match is in ChessFlex. Replay it move by move with the coach's three best moves, guess each of Spassky's moves before you see them, ask the coach why, or take the seat at any moment and play it out against the bots.
In the app: Study › Follow a live game › World Championship 1969: Spassky v Petrosian › Game 1
Part of Study in ChessFlex: one purchase unlocks the coach, Follow a live game and all 53 title matches (on iPhone, try Study free first). Playing the bots is free, with no account and no ads.