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David Bronstein vs Karel Opocensky
Prague-Moscow (1946), Prague CSR, rd 3, Mar-??
Sicilian Defense: Najdorf. Opocensky Variation Modern Line (B92)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
Aug-14-07  wolfmaster: Opocensky plays the Opocensky Variation to the Sicilian Najdorf.
Dec-21-07  Arbitrarily0: This may have been the first time the Opocensky Variation had been recorded.
Dec-22-07
Premium Chessgames Member
  Gypsy: <Arbitrarily0: This may have been the first time ...> I vaguely recall reading that Opocensky experimented with Sicilians e7-e5 already in late 1930's.
Jul-23-13  MasterChessDotCom: The first game Karel played with ...e5 was in Prague, 1943 against Lokvenc - the pgn game can be found if googled but the game isn't in Chessbase either! See GM Daniel King's excellent historical preface in his book 'Winning with the Najdorf'.
Jul-23-13  nescio: [Event "Prague"]
[Site "Prague"]
[Date "1943.??.??"]
[Round "3"]
[White "Lokvenc, Josef"]
[Black "Opocensky, Karel"]
[Result "1/2-1/2"]
[WhiteElo "0"]
[BlackElo "0"]
[ECO "B92"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 b5 7. Bf3 e5 8. Nb3 Bb7 9. a3 Nbd7 10. O-O Qc7 11. Be3 Nb6 12. Na5 Nc4 13. Nxc4 Qxc4 14. Qd3 Qxd3 15. cxd3 Be7 16. Rac1 Rc8 17. d4 O-O 18. d5 g6 19. Be2 Nd7 20. Bh6 Rfd8 21. Bg4 Rb8 22. Bxd7 Rxd7 23. Be3 Bd8 24. b4 Rc7 25. Na2 Rbc8 26. Rxc7 Bxc7 27. Rc1 f5 28. f3 Kf7 29. Kf1 Ke7 30. Ke2 Kd7 31. g4 f4 32. Bf2 Ra8 33. Nc3 Bd8 34. h4 Rc8 35. Kd2 Rc4 36. Na2 Rxc1 37. Kxc1 h5 38. g5 Kc7 39. Kd2 Bc8 40. Ke2 Kb7 1/2-1/2

At about the same time (1943) Boleslavsky, having lost with the French several times to Botvinnik, switched to the Sicilian with ...e5, an idea he probably got from Opocensky. One of his first tries was against, of all people, Botvinnik. Botvinnik vs Boleslavsky, 1943
Stubborn as he was, despite the loss Boleslavsky continued to experiment with the system and he made it into a very reliable setup which Najdorf refined by playing 2...d6 and 5...a6 instead of Boleslavsky's 2...Nc6 and 5...d6

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