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.d4 Nf6 2.Nf3 g6 3.c4 Bg7 4.Nc3 d5 5.cxd5 Nxd5 6.g3Diagram 149 Position after 6.g36.c5This move highlights the strategic idea of the Gruenfeld Defense: Blackwill emphasize the power of his g7-bishop on the a1-h8 diagonal.Hisattack will be supported by a pawn on c5, a knight on c6, and a queen ona5.7.Bg2 Nc68.0-0This move already intends a pawn sacrifice.8.Nxc39.bxc3129 Diagram 150 Position after 9.bxc3White has thrown up a fragile barrier on the a1-h8 diagonal, and with hisnext move Black could have destroyed it.After 9.cxd4 10.Nxd4! Nxd411.cxd4 Bxd4 (11.Qxd4 12.Rb1 0-0 13.Be3 Qxd1 14.Rfxd1) 12.Rb1, Black s attack on the a1-h8 diagonal wins a pawn.Meanwhile,however, White would have good play on the h1-a8 diagonal.9.0-0Black is not tempted by the above variation and makes a useful developingmove.10.dxc5!Instead 10.e3 would make White s position in the center stronger, but theprice would be the demise of the bishop on c1.Now after 10.Bxc3 11.Bh6 Bxa1, 12.Qxa1 takes control of the long diagonal and its darksquares.If 10.Qxd1 11.Rxd1 Bxc3 12.Rb1, the play on the longdiagonal would end there would be nothing remaining on the diagonalfor Black s bishop to attack.White, whose pieces would be betterdeveloped, would have easy targets.10.Qa5Now Black wants to take White s pawns in comfort.The queen has takenthe right position for interaction with the bishop and has freed a place foractivating a rook.11.Nd4!130 Diagram 151 Position after 11.Nd4!Once again White creates a temporary and unsteady barrier, and alsointroduces obvious counter-pressure on the h1-a8 diagonal.At thismoment Black can win the Exchange.However, after 11.Qxc3 12.Nxc6 Qxa1 13.Nxe7+ Kh8 14.Be3, and now, for example, 14.Qxd115.Rxd1, White gets strong threats such as 16.Nxc8 and 17.Bxb7.And the c-pawn supported by the two bishops would give White the betterchances.Notice that throughout this entire variation, the bishop on g7plays no active part.11.Rd8And why not? The rook is developed to an active position, it pins theknight, and the rest of Black s threats are still alive.But White also has auseful move.12.Be3!Diagram 152 Position after 12.Be3!Fortifying the knight on d4.The tension is growing and can t last long!Black must destroy the White knight s point of support at c3, since 12.131 Nxd4 13.cxd4 will just leave White with an extra pawn 13.Bxd4?14.Bxd4 e5 15.Bc3!, and on 12.Bd7, 13.Qb3 will follow.So:12.Qxc3All of the barriers on the long diagonal have been removed, and Black istruly the owner of the highway from h8 to a1! But.13.Nxc6!Diagram 153 Position after 13.Nxc6!Now Black gets the bill! He has declined an extra pawn, he has declinedan Exchange but now he must accept an extra queen!13.Rxd114.Raxd1White s plan is clear.His knight on c6 cannot be taken because of thevariation 14.bxc6 15.Bxc6! (but not 15.Rd8+ Bf8 16.Bh6 Bb7 andBlack wins), and Black s choices are unpalatable: After 15.Rb8 comesthe decisive 16.Rd8+ Bf8 17.Bh6; and after 15.Bh3 16.Bxa8, the c-pawn and the threats to the Black king make Black s position indefensible.14.Bf6132 Diagram 154 Position after 14.Bf6Supporting the pawn on e7 and opening the g7-square for the king.Itlooks like White s threats have subsided, and White has only a rook and aknight for the queen.15.Rd8+ Kg7What is going to happen next?16.Nxe7!A decisive blow.The knight that has traveled through the mine fields (d4,c6, and now e7) brings victory to White.How do you like the threat of 17.Rg8 checkmate? Black must play:16.Bxe717.Bd4+Now who owns the long diagonal?17.Qxd418.Bxc5Rxd419.Rd8 BlackResignsThe pin on the h1-a8 diagonal, the pin on the eighth rank, and theExchange make further resistance meaningless.133 So it turns out that reaping a rich harvest on the long diagonal is not thesame as winning the game!In the next example, the main action takes place on the long, lightdiagonal, h1-a8.Game 28Palatnik MestrovichAlbena, 19771.d4 Nc6Let s not be distracted by the unusual opening.2.Nf3 d63.d5 Ne54.Nxe5 dxe55.g3 e66.c4Diagram 155 Position after 6.c46.Bb4+Dubious.Better is 6.exd5 7.cxd5, which would open up the bishop onc8 and allow the dark-squared bishop to be placed on d6 (where it couldbe protected from White s knight by.a7-a6), with approximately equalchances.134 7.Nc3!Now Black has problems because of threats such as Qa4+ and Qxb4.Oneof those problems is how to deny his opponent the advantage of the twobishops and the domination of the h1-a8 diagonal.7.c68.Qb3 Qd6If 8.Bxc3+ 9.Qxc3, the pawn on e5 will be under attack and White willhave the advantage.9.dxc6 Ne7!?The alternative 9.Qxc6 would permit the promising Exchange sacrificewith 10.Qxb4.White would also have the simple 10.Rg1, with an attackon the bishop on b4, followed by Bg2 and a pawn advantage on thequeenside.Now White s acceptance of the pawn sacrifice after 10.cxb7Bxb7 would help Black develop, and would make it hard for White toactivate his pieces.10.a3!Diagram 156 Position after 10.a3!White wants to dictate the course of the events! Now 10.Bxc3+ 11.Qxc3 would leave White with the two bishops and a better pawn structure.Retreating the bishop is impossible because then 11.cxb7 wins a piece.The only thing left is the move made in the game:10.Qxc6135 Now it seems as if the attack on White s rook wins time for Black toretreat his bishop.11.Qxb4!Inviting the Black queen to travel the long light diagonal.11.Qxh112.Nb5Threatening Nc7+.Castling is impossible for Black because the knight one7 would be left unprotected.12.Qc6The Black queen takes the long-diagonal shuttle!13.Be3White simply plays a developing move.Now the pawn on a7 is underattack, and castling is still impossible for Black.With his next move Blacknot only moves his pawn out of the line of fire, but also tries to push theknight back from its active post.13.a6Diagram 157 Position after 13.a614.Bg2!The bishop nevertheless occupies the long diagonal and does it with atempo.This is an interesting example of decoy and deflection.If Black squeen once again rides the shuttle to take the bishop with 14.Qxg2,136 then the follow-up would be 15.Nc7+.Black could choose his poison: 15.Kd8 16.0-0-0+ Kxc7 17.Qd6 mate; or 15.Kf8 16.0-0-0 g6 17.Bh6+ Kg8 18.Rd8 mate; or in the last line, 16.f6 17.Rd8+ Kf7 18.Rxh8 and, with equal material, White still has an unstoppable attack.14.Nd5This weak attempt at covering up does not help.15.Nd6+ Kd716.cxd5 Qxd617.dxe6+Diagram 158 Position after 17.dxe6+17.Kxe6Also bad are 18.Kc7 19.Rc1+ and 18.Ke7 19.Bc5.The best try is18.Qxe6 19.Bxb7 Rb8 (19.Bxb7 20.Qxb7+ Ke8 21.Qxa8+) 20.Qa4+ Kc7 21.Be4, which would leave Black in a difficult position, but abetter one than in the game.18.Bh3+The bishop has changed its diagonal with decisive effect.Black resigns,because 18.f5 would be met by 19.Bxf5+; and 18.Ke7 loses to 19.Bc5, with the loss of the queen.137 In the next example, a spectacular rook sacrifice gives White rich play dueto the pin on the h4-d8 diagonal and to the weaknesses of the dark squaresin Black s position.Game 29Geller VelimirovichHavana, 1971Diagram 159 Position after Black s 13th move14.Ndxe4!! Nxe4 15.Nxe4 Bxa1 16.Bg5 Bf6 17.Nxf6+ Rxf6 18.Qa1Kf7 19.Re1Diagram 160 Position after 19.Re1Even though his queen s rook is missing, White has an advantage in forcein the main direction of the attack [ Pobierz całość w formacie PDF ]