[Event "Brussels SWIFT"] [Site "Brussels"] [Date "1986.??.??"] [Round "?"] [White "Van der Wiel, John"] [Black "Kortschnoj, Viktor"] [Result "0-1"] [ECO "C07"] [WhiteElo "2555"] [BlackElo "2635"] [Annotator "Korchnoy"] [PlyCount "86"] [EventDate "1986.03.??"] [EventType "tourn"] [EventRounds "11"] [EventCountry "BEL"] [EventCategory "13"] [Source "Ohms"] [SourceDate "1999.07.01"] 1. e4 e6 2. d4 d5 3. Nd2 c5 4. Ngf3 Nf6 5. exd5 Nxd5 6. c4 $6 ({Theory gives} 6. Ne4 {as best, with a slight advantage to White.}) (6. Nb3 {would also be stronger than 6.c4 but to follow theoretical lines, it seems, is too boring for Van der Wiel.}) 6... Nf6 7. Nb3 cxd4 8. Qxd4 ({After this move White has no advantage at all.} 8. Nbxd4 {would be more promising.}) 8... Bd7 ({The simplest way to equalise was} 8... Bb4+ 9. Bd2 Bxd2+ 10. Qxd2 Qc7 {but Black prefers to avoid simplification.}) 9. Bg5 ({Optimistically played, but perhaps White missed Black's next move} 9. Bd2 Nc6 10. Qf4 {would yield a slight edge to White.}) 9... Bb4+ 10. Nbd2 h6 11. a3 (11. Bxf6 Qxf6 12. Qxf6 gxf6 {should lead to approximate equality.}) 11... Nc6 12. Qh4 Be7 {But now White, behind in development and with his queen awkwardly placed, is clearly worse.} 13. Bd3 {Diagram [#]} Rg8 ({Black, of course, could not castle now because of} 13... O-O 14. Bxh6 {with a winning attack. It was possible to simplfy the position with 13. .... Nh7 with about equal chances, but Black, rightly, has more ambitious ideas in mind..}) 14. Bxf6 ({Forced.} 14. Be3 {loses to} g5 15. Qg3 ( 15. Qxh6 Bf8 16. Qh3 g4) 15... g4 16. Ne5 Nh5 17. Nxc6 Bxc6 18. Qe5 Qxd3 19. Qxh5 Bg5 20. Qxg4 Qxd2+ $1 ({or} 20... Bxe3)) 14... Bxf6 15. Qe4 (15. Qg3 { forcing the reply} Qb8 {was somewhaat better.}) 15... g5 16. O-O ({After} 16. h3 Qc7 17. Rb1 (17. O-O Bxb2) 17... h5 {White would have had problems finding a shelter for his king.}) 16... g4 17. Ne1 Bxb2 ({Instead of this pawn grab,} 17... Nd4 18. Qe3 Bc6 19. Ne4 Be5 {looks very promising.}) 18. Rb1 Bc3 19. Qe3 Qc7 $6 ({An inaccuracy.} 19... Bd4 $1 20. Qe2 Qc7 21. Ne4 Be5 22. Kh1 Nd4 { would have led to a completely winning position.}) 20. Ne4 Bd4 21. Qd2 O-O-O ({ Unfortunately} 21... f5 {does not work because of} 22. Rxb7 $1) 22. c5 Be5 23. f4 {Diagram [#]} f5 $1 ({After the game I boasted about my subtle intuition which prevented me from playing the natural 23. .... gxf3 about which my opponent was in fact concerned. During the post-mortem he suggested the following line} 23... gxf3 24. Nxf3 f5 25. Nxe5 fxe4 26. Nf7 exd3 27. Nd6+ Kb8 28. Rxb7+ Qxb7 29. Nxb7 Kxb7 {and Black wins. But then it was my turn to find an improvement. After the interpolation of}) (23... gxf3 24. Nxf3 f5 25. Ba6 $1 bxa6 26. Nxe5 fxe4 27. Nc4 Be8 28. Nd6+ Rxd6 29. cxd6 Qa5 ({or} 29... Qg7 30. Qe2) 30. Qxh6 {Black's position, because of the insecure situation of his king, is suspicious.}) 24. fxe5 fxe4 25. Bxe4 Qxe5 26. Qe3 Rgf8 27. Nd3 Rxf1+ 28. Rxf1 Qc3 29. Rb1 {Diagram [#]} ({Obviously played in order to prevent the exchange of queens by .... Qd4. An alternative was} 29. Bxc6 Bxc6 30. Qxe6+ Bd7 31. Qe4 Bb5 32. Rf7 {when Black has to force an endgame.} Qa1+ 33. Ne1 Qd4+ 34. Qxd4 Rxd4 {because of his badly placed knight at e1. White has problems.}) 29... e5 $2 ({After} 29... h5 {preparing .... e6-e5, Black would have had a big advantage.} 30. Bxc6 {does not work because of} Bxc6 31. Qxe6+ Kc7 32. Qe5+ Qxe5 33. Nxe5 Rd2 {and Black is winning.}) 30. Qxh6 Qd4+ 31. Nf2 Qxc5 32. Rc1 ( {The best practical chance. if} 32. a4 Rf8 $1 {and White will not be able to gain the initiative.}) 32... Qxa3 33. Nd3 Qa4 {Diagram [#]} 34. Qg6 $2 ({ Time trouble! After the natural move} 34. Nc5 {Black would have needed to demonstrate his courage and skill in order to scatter the storm-clouds gathering over his king. So} Qd4+ 35. Kh1 Be8 {(the only move; the attempt to simplify the position by 35. .... b6 would fail to 36.Bf6! and 35. .... Kb8? does not work because of 30.Nxb7!) and now} 36. Qe6+ (36. h3 g3 37. Qe6+ Kb8 38. Qb3 b6) 36... Kb8 37. Qxg4 Qe3 {and Black wins;}) 34... Qd4+ 35. Kh1 Kb8 { But now White has no compensation for the two pawns, because the attacking move which he finally makes.} 36. Nc5 {.... is immediately refuted by} Qxc5 $1 37. Rxc5 Bf5 {White cannot defend his queen and the back rank at the same time. The game is over.} 38. h4 Bxg6 39. Bxg6 g3 40. Rc1 Ne7 41. Bf7 Rf8 42. Rf1 Ng6 43. h5 Nf4 0-1 [Event "Leningrad Interzonal"] [Site "Leningrad"] [Date "1973.06.27"] [Round "17"] [White "Kortschnoj, Viktor"] [Black "Huebner, Robert"] [Result "1-0"] [ECO "B37"] [WhiteElo "2635"] [BlackElo "2600"] [Annotator "Korchnoy"] [PlyCount "76"] [EventDate "1973.06.02"] [EventType "tourn"] [EventRounds "17"] [EventCountry "URS"] [EventCategory "12"] [Source "Ohms"] [SourceDate "1999.07.01"] 1. c4 Nf6 2. Nc3 c5 3. Nf3 g6 4. e4 Bg7 5. d4 cxd4 6. Nxd4 Nc6 7. Nc2 ({ Another popular continuation was} 7. Be3 Ng4 8. Qxg4 Nxd4 9. Qd1 {in my game with Petrosian in 1974 the variation underwent a serious testing} Ne6 10. Qd2 d6 11. Be2 Qa5 12. Rc1 Bd7 13. O-O Nc5 14. Bh6 $1 {White retained an opening advantage.}) 7... d6 8. Be2 Nd7 {For a long time it was thought that the side who allowed his opponent to set up a pawn stronghold in the centre (pawns at c4 and e4) was condemned to a difficult, unpromising defence. Several games won by Botvinnik in the 1930's, convinced the chess world of this. From the standpoint of chess logic, this was not altogether correct, after all while one side is erecting and reinforcing his pawn centre the other gains time for the comfotable deployment of his pieces. Nevertheless, Botvinnik's stratagem remained unshaken for more than 30years!. The manoeuvre of the king's knight, would appear to change the evaluation of the entire opening system.} 9. Bd2 Nc5 {Annotatimg this game in the Yugoslav Informator, grandmaster Kotov, the chief arbiter of the tournament gave an equality sign immediately after 9. .... Nc5. Meanwhile, Black's last move is questionable, since it allows the opponent to extend his control and to eliminate the possible threat to the e-pawn. Therefore 9. .... 0-0 was more subtle, with the intention of playing .... Nc5 on the next move. 9. .... a5 also came into consideration, for a long time preventing the advance of the b-pawn.} 10. b4 Ne6 11. Rc1 O-O 12. Nd5 Ned4 { Both here and on the previous move .... a7-a5 came into consideration, in order to open the a-file. Black has consistently carried out his idea of occupying the d4-square, but, as it later transpires, one well-placed piece is not very significant. Black does not in fact manage to equalise.} 13. Nxd4 Nxd4 14. Bg5 Re8 15. O-O Be6 ({Here too it was still possible to play} 15... a5 {After both} 16. c5 Be6 $1 {and}) (15... a5 16. a3 axb4 17. axb4 Ra2 {the activity of the black pieces woulld have sharply increased.}) 16. Re1 Nxe2+ { White was ready to withdraw his bishop to f1 and then to begin active play in the centre, after driving the knight from its central position by Be3.} 17. Rxe2 Qd7 18. Rd2 {White has a clear advantage in space. Now c4-c5 is threatened, and Black cannot withdraw his queen on account of the attack on his e7 pawn. However, with his next move he tries to solve the problem.} Bxd5 {Diagram [#]} 19. Rxd5 $1 {An unexpected decision in a position where either pawn capture would be ensured a slight, but enduring advantage. However, I quite quickly rejected the capture with the c-pawn : after} (19. cxd5 h6 20. Be3 a5 $1 {Black would have opened another file for his rooks and gained equal chances. The standard 19.exd5 would have given White a slight spacial advantage and pressure on the e-file. And the capture by the rook? In the absence of the knights and a light-squared bishop, the rook on d5 is invulnerable, and it will prevent the pawn thrusts .... a7-a5, .... f7-f5 and e7-e6.}) 19... Qe6 20. Qd3 Rac8 21. Be3 a6 22. h3 Rf8 23. g4 {White parries the attempt by Black to free himself with .... f7-f5, and has in mind a possible pawn offensive on the kingside. Such a committing advance of the pawn demands active play on the part of White as otherwise it will turn into an irreparable weakening.} Qf6 24. Bg5 Qb2 ({In the event of} 24... Qe6 { White was intending to play f2-f4-f5, further cramping his opponent. The queen on b2 hinders the coordination of the white pieces, but on the other hand it is away from the main battlefield and this will soon tell.}) 25. a3 Rc7 26. c5 $1 Rfc8 ({Taking on c5 would have led after} 26... dxc5 27. Rcxc5 Rxc5 28. Rxc5 {to a position where Black still has serious problems. Hubner tries to exploit this pin on on the c-file but this turns out unsatasfactorily, as he soon faces problems in defending his back rank. 26. .... h6 would also have left White with the advantage after 27.Bf4.}) 27. Kg2 {Diagram [#]} ({During the game and after it (for the next 27 years!) I thought that 27. .... Bf8 was a grave mistake and believed that instead Black should have continued} 27. Kg2 h6 28. Bf4 Kh7 {with a tenable position. Now I would say that Hubner understood the position better than I did, and that his move deserved an exclamation mark, since it was the best practical chance! Well, let me disclose the secret of the position : after}) (27. Kg2 h6 28. Rc2 $1 Qb1 29. Bxe7 $1 Rxe7 30. cxd6 $1 Ree8 31. d7 {White would win on the spot!}) 27... Bf8 28. cxd6 $1 exd6 ({If} 28... Rxc1 {then} 29. Bxc1 Qxc1 30. d7 Rd8 31. Rc5 -- { and} 32. Rc8) 29. Rxc7 Rxc7 {Diagram [#]} 30. e5 {Were it not for this move, it would have been unclear who was beating whom! But now White's heavy pieces break through onto the eigth ank or else he obtains a powerful passed pawn at d6.} Rc2 ({If} 30... Rc3 {then} 31. Qd4 dxe5 32. Qxe5 Rc2 33. Qxb2 Rxb2 34. Bf6 $1 ({not} 34. Rd8 Kg7 35. Be3 Ra2 36. Bd4+ Kg8 {when White wins a pawn but not the game.}) 34... Re2 35. Rd8 Re6 36. g5 {and the pin on the eighth rank must prove fatal for Black.}) (30... h6) 31. Bd2 {The most economic way of combining defence on the second rank with attack on the eighth! Other possibilities were less convincing.} dxe5 ({The attempt to seize the initiative with} 31... Bh6 {could have been parried either by a 'defensive' variation} 32. Bxh6 Rxf2+ 33. Kg3 Rg2+ 34. Kh4 Qf2+ 35. Kg5 {or by an attacking one}) (31... Bh6 32. Be1 dxe5 33. Rd8+ Kg7 34. Qd6 {with threats that can hardly be parried.}) 32. Rd8 Kg7 33. Qe3 Be7 ({Or} 33... Kf6 34. Rxf8 Rxd2 35. Qf3+) 34. Qh6+ Kf6 {Diagram [#]} 35. Qh4+ ({Of course not} 35. Qg5+ Ke6 36. Re8 f6 {when it is Black who wins.}) 35... Ke6 36. Re8 Rxd2 ({If} 36... Rc7 37. Bg5 {and Black loses a piece.}) ({or} 36... f6 37. Qxh7 Rc7 38. Be3 { and there is no satisfactory defence against 39.Bc5.}) 37. Qxe7+ Kd5 38. Rd8+ ( 38. Rd8+ {Now if} Kc4 39. Qc5+ Kb3 40. Qe3+) ({while if} 38. Rd8+ Ke4 39. Qxb7+ Kf4 40. Qf3+ Kg5 41. Qe3+) {Therefore Black played ......} 38... Kc6 (38... Kc6 {and without waiting for the obvious reply} 39. Qc5# {he resigned.}) 1-0 [Event "Stockholm Interzonal"] [Site "Stockholm"] [Date "1962.02.07"] [Round "8"] [White "Kortschnoj, Viktor"] [Black "Filip, Miroslav"] [Result "1-0"] [ECO "A30"] [Annotator "Korchnoy"] [PlyCount "81"] [EventDate "1962.01.27"] [EventType "tourn"] [EventRounds "23"] [EventCountry "SWE"] [Source "Ohms"] [SourceDate "1999.07.01"] 1. c4 Nf6 2. Nc3 c5 3. g3 e6 4. Nf3 b6 5. Bg2 Bb7 6. O-O Be7 7. d4 cxd4 8. Qxd4 O-O 9. Rd1 {Diagram [#]} ({Judging by the position, Black should aim to equalize by .....d7-d5, and White should prevent this In this sense, as I established after the game} 9. e4 {is stronger. In the event of} Nc6 10. Qe3 d5 11. e5 {and} d4 {will not be right because of} 12. Nxd4 {What is not altogether clear to me is how White gains an advantage after 9.e4 d5?, but for some reason no one has played the line.}) 9... Qc8 ({One of the games of Ulf Andersson, a great expert in this position, went} 9... Nc6 10. Qd2 (10. Qf4) 10... Na5 11. b3 {with approximate equality. True Andersson's game was played a quarter of a century after the present one, but the manouevre he employed is not too hard to find. But my opponent had something else in mind.}) 10. e4 d6 {Up to then no one had played this against me! For some reason I had not also come across this position in chess literature. Is not this game the ancestor of the hedge-hog positions that were so frequently analysed at the end of the 20th century!?} 11. b3 Nc6 {In the more modern interpretation of the hedge-hog position, in order to achieve a better coordination of the pieces, the queen's knight is developed at d7. In this case .... a7-a6 is sometimes played in advance. For a further discussion on this type of set-up, see my game with Greenfield (Beer - Sheva 1990)} 12. Qd2 Rd8 13. Qe2 {Diagram [#]} Nd7 14. Ba3 Qb8 15. Rd2 Nc5 16. Rad1 ({White's pieces have put intense pressure on the d6-pawn, but whether this set-up will bear any fruit is for the moment not clear. It would appear that White is now threatening b3-b4, e.g.} 16. Rad1 a6 17. b4 Nd7 18. b5 axb5 19. Bxd6 Bxd6 20. Rxd6 b4 21. Nb5 Nf6 22. e5 Ne8 23. Rxd8 Nxd8 24. Qd2 Nc6 25. Qd7 {with an overwelming advantage. White's superiority is less clear afer 21. ..... Nc5 22.e5 h6. But Black does not intend to open the opponent's line. He has his own plan which he began carrying out with .... Nd7, and which he now continues.}) 16... e5 {[%csl Yd6] Now Black too will have some fortifications in the centre, although not so powerful as White's. Experts on the Hedgehog do not make such a move.} 17. Nd5 Bf8 18. Bb2 Ne6 {Diagram [#]} 19. b4 {A committing decision, but resoluteness is not something in which I am lacking. Now in the future White will have to reckon not only with .... b6-b5, but also with the undermining move ..... a7-a5. But firstly, as I have already said, without pawn advances the hedgehog cannot be breached. And specifically, I did not want to allow Black to post his bishop at g7. That is, 19.b4 has the aim of preventing 19. .... g6.} Re8 ({Against} 19... g6 {after the game I gave the following variation:} 20. b5 Na5 21. Nf6+ Kg7 22. Nxe5 dxe5 23. Rxd8 Nxd8 24. Nd7 Qc8 25. Bxe5+ Kg8 26. Nxf8 Kxf8 27. c5 {with a strong attack. The Variation is not a bad one, but the move 26.Nxe8 causes serious doubts: how can White exchange such a powerful knight? Many yars later, I corrected the variation - White should play c4-c5 as early as the 22nd move! After}) (19... g6 20. b5 Na5 21. Nf6+ Kg7 22. c5 bxc5 {(it is difficult to think of another move here for Black)} 23. Nxe5 dxe5 24. Rxd8 Nxd8 25. Nd7 Qc8 26. Bxe5+ Kg8 {White wins by force.} 27. Bh3 Ne6 28. Bxe6 fxe6 29. Qg4 {and Black is unable to defend his king. The rook move to e8 is not a very happy one. Now Black will be unable to play g7-g6 because of Nf6+. But in a cramped position every move has its drawbacks.}) 20. a3 (20. Bc3 {was better, in order to be properly secured against a7-a5 and to clear the b-file for one of the roooks.}) 20... Bc8 21. h4 Qb7 22. h5 h6 {Diagram [#]} 23. Ne3 $2 ({After White has gained the f5 square for his pieces, his position has become completely won. The other knight should have been transferred to f5} 23. Qe3 Rb8 24. Nh4 $1 Ned4 ({after} 24... Ncd4 25. Nf5 Nxf5 $5 26. exf5 Ng5 27. Nf6+ { Black loses his queen.}) 25. b5 Na5 26. Bxd4 Nxc4 27. Qd3 Nxd2 28. Be3) 23... Qc7 24. Nf5 Rd8 25. Rd3 a5 26. Bc3 axb4 27. axb4 b5 $1 28. cxb5 {Diagram [#]} Na7 29. Qd2 $2 ({White was already in time trouble, and as a result he did not exploit all th possibilities of his position.} 29. Bb2 {was correct. For the moment Black cannot take on b5 in view of} Nxb5 30. Nxe5 dxe5 31. Rxd8 Nxd8 32. Qxb5 {He must play} Rb8 {Then the knight at f5 should return to d6}) 29... Nxb5 (29... Bb7 {is weaker in view of} 30. b6 Qxb6 31. Nxd6) 30. Bxe5 ({Now Black couls have equalised without difficulty and even gained a minimal advantage (!) , by continuing} 30. Bxe5 dxe5 31. Rxd8 Nxd8 32. Qxd8 Ra1 33. Kh2 Rxd1 34. Qxd1 Nc3 35. Qc2 Bxb4 {Perhaps Filip did not see in advance the rook move to a1? This is unlikely. With me in severe time trouble , he decides to play for a win He makes a move, after which White is forced to part with material.}) 30... Bb7 $1 (30... Bb7 {This loooks very strong. Now} 31. Nxd6 Nxd6 32. Bxd6 Bxd6 33. Rxd6 Rxd6 34. Qxd6 Rd8 {will not do, and if the bishop moves from e5, Black will take on e4.}) 31. Rc1 {Diagram [#]} Qb8 ({If} 31... Qb6 32. Bd4 { and White retains his extra pawn.}) 32. Bxg7 $1 {The piece sacrifice is forced, but fortunately it is very strong! The majority of the black forces are crwded togetheron the queenside and will be unable to take part in the defence of their king - White's attack is irresistible!} Bxg7 ({If} 32... Bxe4 { then White can gain an advantage in various ways, the most elegant being} 33. Nxh6+ Kxg7 34. Ng5 $1 Bxd3 35. Nxe6+ fxe6 36. Qxd3 {and Black has no way against the threat of 37.Qg6+ with mate}) 33. Nxh6+ Bxh6 34. Qxh6 Bxe4 35. Re3 d5 {Diagram [#]} (35... Qb7 36. Ng5 Bxg2 37. Qh7+ Kf8 38. Rxe6 fxe6 39. Nxe6+ ( {In fact White also has a forced mate by} 39. Qh8+ Ke7 40. Qg7+ Ke8 41. Qg8+ Kd7 42. Qf7#) 39... Ke8 40. Qg8+ Ke7 41. Nxd8 Rxd8 42. Qg7+ Ke6 43. Re1+ { and Black's queen is lost}) 36. Ng5 $1 Qe5 ({If} 36... Nxg5 37. Qxg5+ Kh7 ({or } 37... Kf8 38. Qh6+ Kg8 39. Bxe4 dxe4 40. Rc5) 38. Rxe4) 37. Rxe4 Qxg5 38. Rxe6 Qxh6 39. Rxh6 {The complications have ended - White is two pawns up. The time scramble is coming to an end.} Ra4 (39... Rab8 {was more tenacious. White would still have had to combat the passed d-pawn.}) 40. Rb6 Nd4 41. Rc5 ( 41. Rc5 {The sealed move. Black's position is hopeless. Two possible variations} Ra1+ 42. Kh2 Ra2 43. Rf6 Kg7 44. Rxd5 Kxf6 45. Rxd8 Ne6 46. Rg8 Rxf2 47. h6 Rf5 48. g4) (41. Rc5 Ne2+ 42. Kh2 d4 43. Rg5+ Kf8 44. h6) 1-0 [Event "Hoogovens"] [Site "Wijk aan Zee"] [Date "1997.01.21"] [Round "3"] [White "Kortschnoj, Viktor"] [Black "Onischuk, Alexander"] [Result "1-0"] [ECO "A85"] [WhiteElo "2635"] [BlackElo "2580"] [Annotator "Kortschnoj"] [PlyCount "67"] [EventDate "1997.01.18"] [EventType "tourn"] [EventRounds "13"] [EventCountry "NED"] [EventCategory "16"] [Source "Ohms"] [SourceDate "1999.07.01"] 1. c4 f5 2. Nc3 Nf6 3. d4 g6 4. f3 $5 {This idea occurred to me some time ago, some twenty years before the present game. In the Dutch Defence, Black takes control of the central e4 square, and bases his counterplay on the possession of this square. But how will Black feel if the e4 square is nevertheless controlled by White? I tried this idea in a game with Lombardy at Lone Pine. 1979. In a position with a great positional advatage, I blundered and lost the game. And as a result, for many years I discarded the essentionally quite good and logical opening idea that had been tested in that game. And now I returned to it, to the surprise of my young opponent.} Bg7 5. e4 fxe4 6. fxe4 d6 7. Nf3 {White develops his pieces in the most logical way. The set up with Be2 and Bg5 also comes into consideration.} O-O ({It would seem to be more difficult to retain an opening advantage after} 7... e5 {In the event of} 8. d5 Nh5 {Black has a good game. White can count on some advantage after}) (7... e5 8. dxe5 dxe5 9. Qxd8+) 8. Be2 c5 ({It would seem to be more difficult to retain an opening advantage after} 8... e5 9. dxe5 dxe5 10. Qxd8 Rxd8 11. Bg5 c6 12. O-O) 9. d5 Ng4 10. O-O Ne5 ({A year after this game, I again played the variation - in a rapid-play game against the young Polish player Miton. He very slightly improved Black's play -} 10... Nd7 11. Qe1 Nde5 12. Kh1 e6 13. Qg3 exd5 14. Bg5 Qd7 15. Nxd5 {but here too, after}) (10... Nd7 11. Qe1 Nde5 12. Kh1 e6 13. Qg3 exd5 14. Bg5 Qd7 15. Nxd5 {White gained a menacing initiative on the kingside.}) 11. Bg5 Nbd7 {Diagram [#]} 12. Kh1 $1 {The e5 square is the pride of Black's position, but it is overloaded with pieces aiming to occupy this square. Very often such a detail proves 0to be a serious drawbak to a position! Sooner or later Black will be forced to exchange on f3 and White is ready to recapture with the pawn!} h6 13. Bd2 a6 14. Qc2 Rb8 15. a3 Qe8 {The position is unusual - it is not often that one like this is encountered. It is clear that the a7 pawn divides Black's position in two, hindering the coordination of his pieces. This means that in the first instance Black must consider how it will turn out if he advances his e-pawn - one square or two.} 16. b4 Nxf3 17. gxf3 b5 ({Here} 17... e5 $5 { was possible, with a good game for Black. If White does not exchange on e6, then Black has chances os seizing the initiative on the kingside, while after dxe6 Black frees his position even more, by playing his queen to h3 and his knight - via e5 and c6 - to d4.}) 18. cxb5 axb5 19. f4 ({The advance of the f-pawn was planned by White , but it would have been better not to hurry with this move. Stronger was} 19. Rab1 c4 (19... Ne5 20. bxc5 dxc5 21. f4 {with a clear plus for White. or}) 20. Be3 Ne5 21. f4 Ng4 22. Bg1 {with advantage to White.}) (19. Rab1 Ne5 20. bxc5 Bh3 21. c6 $1 {with more than sufficient compensation for the exchange.}) (19. Nxb5 {also came into consideration -- after} Bxa1 20. Nc7 Qf7 21. Rxa1 Ne5 22. Bxh6 {White stands better.}) 19... Qf7 ({And here} 19... e6 $1 {was essential. In the event of} 20. dxe6 $6 Qxe6 21. Nxb5 Bb7 22. Bc4 d5 23. Nc7 Qh3 24. Nxd5 Bxa1 25. Rxa1 Qf3+ {Black gains a draw by perpetual check, but he can also sacrifice his queen}) (19... e6 20. dxe6 Qxe6 21. Nxb5 Bb7 22. Bc4 d5 23. Nc7 Qxe4+ 24. Qxe4 dxc4 25. Nd5 Nf6 26. Qxg6 Nxd5 27. Kg1 Kh8 {with a dangerous initiative. White should continue}) ( 19... e6 20. Nxb5 Bxa1 21. Rxa1 exd5 22. Nxd6 Qe6 23. e5 {or}) (19... e6 20. Nxb5 Bxa1 21. Rxa1 Qe7 22. Nc7 {with full compensation for the material sacrificed.}) 20. Rg1 Bd4 {Diagram [#]} ({This move (knowing the continuation of the game!) looks rather naive. But here the so long-waited .... e7-e6 would now have been clearly too late.} 20... e6 21. Nxb5 {(and here the book variation goes astray giving 21. ....Bxg1, but of course the bishop is on g7 and .... Bg7 has yet to be played.)}) 21. e5 $1 {Of course! Everything has long been ready for this move!} Nxe5 {Forced.} 22. fxe5 Bf5 23. Bd3 Bxd3 ({Or} 23... Bxc3 24. Bxf5 Qxd5+ 25. Be4 Qxd2 26. Rxg6+ Kh8 (26... Kf7 27. Qxd2 Bxd2 28. Rf1+ Ke8 29. Bc6+) 27. Rag1 Rf2 (27... Rg8 28. Qxc3) 28. Qxd2 Bxd2 29. Rg7 Bg5 30. Rh7+ Kg8 31. Rxh6 {and wins.}) 24. Qxd3 Bxg1 25. Rxg1 Kh7 26. bxc5 { For the moment White has only a slight material advantage. His trump cards are the mobile pawns in the centre, one of which may slip through to the queening sqaure.} dxc5 27. Ne4 Qf5 ({Here and on the following move Black could have exchanged queens. After} 27... Qf3+ 28. Qxf3 Rxf3 29. d6 {it is probable that he would soon have had to give up one of his rooks for the d-pawn and one of White's minor pieces. To avoid a technically lost ending, Onischuk seeks salvation in complications.}) 28. Qe3 Qh5 29. d6 (29. Nxc5 { was simpler.}) 29... Rf3 $2 {Diagram [#]} ({More tenacious was} 29... exd6 30. Nf6+ Rxf6 31. exf6 Re8 $1 32. Qf4 (32. Qxe8 Qf3+ {with a draw.}) 32... Re2 ({or } 32... Qd5+ 33. Rg2 g5 {when White still has to demonstrate the superiority of his piece over the pawns.})) 30. dxe7 $1 {The young player had not seen this move.} Rxe3 31. Nf6+ Kh8 32. Nxh5 Rd3 33. Rxg6 Rxd2 34. Rd6 1-0