日語書寫系統

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Notes by Grandmaster Lubomir Kavalek

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Hikaru Nakamura – Sergey Alexandrovich Karjakin
4th Zürich Chess Challenge; Zürich, February 16, 2015
English Opening A33

1. Nf3 Nf6 2. c4 c5 3. Nc3 Nc6 4. d4 cxd4 5. Nxd4 e6 6. g3 Qb6. Although this attack along the diagonal a7-g1 was played in 1950, it was a big surprise for Donald Byrne during his game against [Efim Petrovich] Geller, played in the match USA–USSR in Moscow in 1955. Byrne took 75 minutes on his next move! 7. Ndb5 Ne5. Now it was Geller’s turn to think and he spent 30 minutes on his Knight move, threatening not only ... Ne5xc4 but also ... Qb6-c6. It had such a big influence on the opening theory that the variation has not been tried by White in two decades and only appeared in serious tournaments in 1989. 8. Bf4 Nfg4 9. Qa4!? It was only in 2008 when the Armenian players came up with this daring move, ignoring the threat to the Pawn on f2. 9. ... g5. This deflection became the main line. Other moves are risky. 9. ... Qxf2+ 10. Kd2 threatening Nb5-c7+ and h2-h3. 9. ... Bc5 10. 0-0-0 f6 11. b4±. 10. Bxe5 Qxf2+ 11. Kd1 Nxe5 12. Nc7+ Kd8 13. Nxa8 Qd4+ 14. Kc2 Nxc4. After some forced moves, we have reached a critical stage. At this point the game Magnus Carlsen – Leinier Domínguez Pérez, Linares 2009, was quickly drawn after 15. Kb3 Nd2+ 16. Kc2 Nc4 17. Kb3 Nd2+ 18. Kc2. 15. e4!? Karjakin didn’t expect this move and it confused him. Black is already a Rook down, but has to sacrifice the Knight to equalize. Computers can deal with that but Karjakin falters. 15. ... Ne3+? Black had to play 15. ... Qd2+ 16. Kb3 Qxb2+! 17. Kxc4 and now Black has two ways to continue: 17. ... Bg7! {17. ... d5+ [Nakamura expected this move] 18. Kd3! [Hikaru’s plan. 18. exd5?! Bg7 19. Qb3 exd5+ 20. Kc5 Qf2+ 21. Kb4 Bd7 22. Be2? (A blunder. 22. Bb5 a5+ 23. Ka4 Qd4+ 24. Ka3 Bf8+ 25. Kb2 Qd2+ 26. Qc2 Ba3+ 27. Kxa3 – 27. Kb3 a4+; 27. Kb1 Bf5! – 27. ... Qxc2 28. Rac1+/=) 22. ... Bf8+ 23. Ka5 Qc5+ 24. Nb5 b6+ 25. Ka4 (25. Ka6 Qc8+ 26. Kxa7 Bc6 wins) 25. ... Qd4+ 0 : 1 Ponkratov – Zablotsky, Voronezh 2009] 18. ... Bg7 19. Ne2! Qxa1 20. Bg2 Qe5 21. Qxa7 dxe4+ 22. Ke3 with White’s edge} 18. Qa5+ (18. Qb4 d5+ 19. exd5 b5+ 20. Kxb5 Bd7+ 21. Kc4 exd5+ 22. Nxd5 Qd4+ 23. Kb3 Qxd5+ 24. Bc4 Qf3+ 25. Kc2 Bf5+-+) 18. ... b6 19. Qxg5+ f6 20. Qb5 Ba6 21. Qxa6 f5 22. Qxa7 Qxc3+ 23. Kb5 Qc6+ leads to a draw by perpetual check. 16. Kb3 Qd2 17. a3! And just like that Black’s attack is over. The White King can nest on the square a2. 17. ... Qc2+ 18. Ka2 Qxa4 19. Nxa4 Nxf1 20. Rhxf1 b5

21. N4b6! Stronger than 21. Nc3 Bb7. 21. ... axb6 22. Nxb6 Bb7 23. Rxf7 Bc6 24. Rd1 Be7 (24. ... Ke8 25. Rfxd7+-) 25. Rf3! The Rook helps to hunt down the Pawn on d7. 25. ... Kc7. 25. ... Ke8 26. Rc3 Rf8 27. Nxd7 Bxd7 28. Rc7 and the light Bishop is trapped. 26. Nxd7! Rd8 (26. ... Bxd7 27. Rc3+ Bc6 28. Rdc1+-) 27. Rc3! The final nail. 27. ... Rxd7 28. Rdc1 Rd6 29. e5 wins. 1 : 0. (Lubomir Kavalek, The Huffington Post, February 23, 2015).