Lesson
White to move. Main line: 1. c4 e6 2. Nf3 d5 3. d4 Nf6 4. Nc3 Be7 5. Bg5 O-O 6. e3 h6 7. Bh4 b6 8. cxd5 Nxd5 9. Bxe7 Qxe7 10. Nxd5 exd5 11. Rc1 Be6 12. Qa4 c5 13. Qa3 Rc8 14. Bb5 a6 15. dxc5 bxc5 16. O-O Ra7 17. Be2 Nd7 18. Nd4 Qf8 19. Nxe6 fxe6 20. e4 d4 21. f4 Qe7 22. e5 Rb8 23. Bc4 Kh8 24. Qh3 Nf8 25. b3 a5 26. f5 exf5 27. Rxf5 Nh7 28. Rcf1 Qd8 29. Qg3 Re7 30. h4 Rbb7 31. e6 Rbc7 32. Qe5 Qe8 33. a4 Qd8 34. R1f2 Qe8 35. R2f3 Qd8 36. Bd3 Qe8 37. Qe4 Nf6 38. Rxf6 gxf6 39. Rxf6 Kg8 40. Bc4 Kh8 41. Qf4
Fischer’s 20.e4 is the strategic hinge. After 20...d4, Black’s central pawns become fixed targets while White gains space for e5 and f4-f5. The attack grows from the pawn structure rather than from a sudden tactical mistake.
The quiet manoeuvres from moves 29 to 36 are part of the point. Fischer improves the queen, doubles the rooks and waits until every attacking piece is ready. Black’s queen shuffles between d8 and e8 but cannot create counterplay.
Only then comes 38.Rxf6. The exchange sacrifice opens the g-file and leaves the remaining rook, queen and bishop around the king. Spassky resigned after 41.Qf4 because the attack continues with threats such as Qxh6 and Rg6+.
Why the opening was a surprise
Fischer was identified so strongly with 1.e4 that beginning Game 6 with 1.c4 changed the preparation problem immediately. The game soon transposed into a Queen’s Gambit Declined, allowing Fischer to contest a type of position that Spassky knew well while denying him a familiar forecast of Fischer’s own repertoire.
The surprise did not win the game by itself. Its value was practical: Spassky had to make independent decisions in a strategically rich position. By move 18, White had exchanged minor pieces, reduced Black’s control of the centre and left the c- and d-pawns as long-term targets.
20.e4 fixes the position
The move 20.e4 is the centre of the game. When Black replies 20...d4, the pawn on d4 gains space but also becomes fixed. White can build e5 and f4-f5 around it, while Black has no equivalent pawn break that frees the pieces or distracts White’s king.
This is a model of converting a structural advantage into an attack. Fischer does not rush toward the king because the board is not ready. He first restricts Black, improves the bishop on c4, places the queen on h3 and doubles the rooks on the f-file. The attack becomes dangerous because Black has no active plan elsewhere.
The quiet moves are the masterpiece
From moves 29 to 36, White’s queen and rooks improve while Black’s queen repeats between d8 and e8. Moves such as h4, a4, R2f3 and Bd3 are not decorative waiting moves. They remove counterplay, add one more attacker and make sure the eventual sacrifice cannot be answered by a tactical resource.
For players who associate brilliance only with checks, this phase is the most valuable part of the game. Fischer has the initiative but refuses to spend it early. Each move increases the number of threats Black must meet while reducing the number of useful defensive moves available.
38.Rxf6 turns pressure into a result
After 37.Qe4 Nf6, Fischer finally plays 38.Rxf6. The rook is exchanged for the knight, but 38...gxf6 opens the g-file and allows the other rook to capture on f6. White’s queen, rook and bishop then surround the king while Black’s heavy pieces remain tied to defence.
Spassky resigns after 41.Qf4. The threat is not a single hidden trick; Black must answer Qxh6, Rg6+ and mating ideas while lacking a satisfactory way to exchange the attacking pieces. The game is celebrated because the final tactic is the logical conclusion of twenty moves of restriction and improvement.
18.Nd4: Exchanges a defender and reduces the mobility of Black’s central pawns before White expands.
20.e4: Fixes the centre and creates the connected e5 and f5 space-gaining plan.
38.Rxf6: Only after every piece is ready does White give material to open the final lines around the king.
Opening surprise creates decision-making work; it does not replace accurate play after the surprise is over.
Fix a weakness before attacking it. A pawn that cannot move is easier to organize against.
When the opponent has no counterplay, improve the position of every attacker before sacrificing.
The strongest tactical finish is often the last step of a positional plan, not an isolated discovery.
Source: PGN Mentor: 1972 World Championship — https://www.pgnmentor.com/events/WorldChamp1972/
Source: ChessBase: Fischer–Spassky Game 6 at 50 — https://en.chessbase.com/newsroom/post/50-years-ago-today-fischer-spassky-game-six?page=0
Source: FIDE: the 1972 match as a television milestone — https://www.fide.com/images/stories/NEWS_2016/FIDE_News/GA_Agenda_2016/Annex_94.pdf