Tigran Petrosian vs. David Bronstein, 1956
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The final position after 36... Nxd6
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| White | Tigran Petrosian |
|---|---|
| Black | David Bronstein |
| Result | 0–1 |
| Date | 28 March 1956 |
| Event | Candidates Tournament |
| Round | 2 |
| Site | Amsterdam NED |
| Opening | E66 |
| Moves | 36 |
| Analysis | Stockfish 19, depth 22 |
| Critical moments | 1 |
Tigran Petrosian vs. David Bronstein is a chess game played on 28 March 1956 at Amsterdam NED, in round 2 of “Candidates Tournament”. David Bronstein, with the black pieces, won in 36 moves. The opening is classified as ECO E66. The engine found one critical moment, where a single move cost at least 20 points of winning chances or changed the expected result; it is a “what would you play?” question below.
The game
1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 c5 6. O-O Nc6 7. d4 d6 8. dxc5 dxc5 9. Be3 Nd7 10. Qc1 Nd4 11. Rd1 e5 12. Bh6 Qa5 13. Bxg7 Kxg7 14. Kh1 Rb8 15. Nd2 a6 16. e3 Ne6 17. a4 h5 18. h4 f5 19. Nd5 Kh7 20. b3 Rf7?! (An inaccuracy: Black's winning chances fall from 33% to 23%.) 21. Nf3 Qd8 22. Qc3 Qh8 23. e4 fxe4 24. Nd2 Qg7 25. Nxe4 Kh8 26. Rd2 Rf8 27. a5 Nd4 28. b4 cxb4 29. Qxb4 Nf5 30. Rad1 Nd4 31. Re1 Nc6 32. Qa3 Nd4 33. Rb2 Nc6 34. Reb1 Nd4 35. Qd6 Nf5
Show the answer
Best was 36. Qa3, the engine's line being 36. Qa3 b5 37. cxb5 Bb7 38. Ndc3 Rbc8 39. bxa6 Bxa6 +−. With it, White's winning chances stay at 90%.
In the game White played 36. Ng5??, a blunder that turned a winning game into a losing one. White's winning chances fell from 90% to 6%. The refutation: 36... Nxd6 37. Ne6 Qg8 38. Ng5 Nxc4 39. Rc2 Nxa5 40. Ne7 −+.
36. Ng5?? (A blunder that turned a winning game into a losing one: White's winning chances fall from 90% to 6%.) 36... Nxd6 0–1
Conclusion
The game ended 0–1 after 36... Nxd6. David Bronstein was clearly ahead: the engine gives 94% winning chances. In the engine's grading, White made one blunder, and Black made one inaccuracy.
PGN
[Event "Candidates Tournament"] [Site "Amsterdam NED"] [Date "1956.03.28"] [Round "2"] [White "Tigran Petrosian"] [Black "David Bronstein"] [Result "0-1"] [ECO "E66"] [PostmortemId "347a64e837"] 1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 c5 6. O-O Nc6 7. d4 d6 8. dxc5 dxc5 9. Be3 Nd7 10. Qc1 Nd4 11. Rd1 e5 12. Bh6 Qa5 13. Bxg7 Kxg7 14. Kh1 Rb8 15. Nd2 a6 16. e3 Ne6 17. a4 h5 18. h4 f5 19. Nd5 Kh7 20. b3 Rf7 21. Nf3 Qd8 22. Qc3 Qh8 23. e4 fxe4 24. Nd2 Qg7 25. Nxe4 Kh8 26. Rd2 Rf8 27. a5 Nd4 28. b4 cxb4 29. Qxb4 Nf5 30. Rad1 Nd4 31. Re1 Nc6 32. Qa3 Nd4 33. Rb2 Nc6 34. Reb1 Nd4 35. Qd6 Nf5 36. Ng5 Nxd6 0-1