A.Shashin - V.Korchnoi [E57]
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 c5 6.Nf3 d5 7.0-0 Nc6
One of the ways of discharging at the centre and dodging "the tabia".
An alternative is - 9. axb4 dxc3 10.bxc3 dxc4 11.Bxc4 Qc7 12.Qb3 with slightly better position of White.
Black voluntarily yields two Bishops to the rival. More often is met 9...dxc4 10.Bxc4 Be7.
10.bxc3 dxc4 11.Bxc4 Qa5 12.Bb2
Another possible aligument is 12.Qc2 e5 13.Be3.
12...e5 13.Re1 Bg4
Or 13...e4 14.Nd2 Bg4 15.Be2 Bf5 (more accurate 15...Bxe2 16.Qxe2 Rfe8) 16.Nc4 Qc7 17.Ne3 Bg6 18.c4 and White stands somewhat better. (Timman - Ligtering, Weik-ann-Zee, 1979)
14.h3 Bxf3 15.Qxf3 Rad8 16.Ba2!?
White withdraws a Bishop from under strike in advance.
It quite possible 16...ed4 17.cxd4 Nxd4. By 18. Qd3!? (but not 18.Qxb7? Rd7! (но не 18...Nc2 19.Re5 with initiative) 19.Qb4 Qxb4 20.axb4 Nc2 Black has superiority and White loses quality) Nc6 19.Qg3 White gets initiative for a Pawn's sacrifice. Black still prefers to fortily its position.
17.Re2 Rfd8 18.Rae1 exd4
Now Black ought to exchange pawns and White's potentional increases.
One more taking is not good of course: 19...Nxd4? 20.Bxd4 Rxd4 21.Re8+! with three move mate.
But nevertheless, White pressing make the rival take 'd4' Pawn open a big diagonal to the black Bishop and make possible a Rook invade the seventh horizontal.
Queen or Rook cannot take it: 21.Qg3, and White wins.
21...Kf8 deserves attention, forcing out White's daugerous Rook. For examples, 22.Rxd7 Rxd7 23. Qc8+ Rd8 24.Qc4 Rd7, and Black can hold.
In case of 22...Ne6 White can shift to a favourable ending: 23.Qb3! Qxb3 24.Bxb3 Nd5. True, after 25.Rxb7 Nc5 26. Rb5 (26.Bxd5? Nxb7 27.Bxb7 Rb8 -+) 26...Nxb3 27.Rxb3 f6 28. Rb5 White retain superiority.
If it had a move White would smash the enemy position into smithereens, so powerful its multi-barred battery looks. But the move belongs to Black.
23... Rd1+ 24.Kh2 Qd6+?
As the analysis shows this check is not good. It brings to draw 24...Ng4+! 25.hxg4 Qd6+ 26. Qg3 (the only defence otherwise mate) Nxg3 (it is not good 26...Qh6? 27.Qh3 Qf4 28.g3 Qxf2+ 29.Qg2 Qxg2+ 30.Kxg2 Rd2+ 31.Kh3 Rxb2 32.Be6 Nd4 33.Rxb7 Nxe6 34.Rxb2 and White wins) 27.Rd7+ Kf8 28.Bxg7+ Ke8 29.Rxd6 Nf1+ 30.Kg1 Nd2+ 31.Kh2 Nf1+ with perpetual checking. If White wish to continue struggle: 32.Kh3 Rxd6 33.g5, after 33...Rd2 (or 33...Rd3+ 34.Kg4 Rxa3 35.Bg8 a5 the play is not clear) 34.Bb1 Rxf2 35.Bxh7 Ra2 chanees are rather on the Black's side.
25.g3 Ng4+ 26.Kg2
If 26. hxg4?? Qh6 27.Kg2 Qh1 mate
26...Nh4+!? 27.gxh4 Qh2+ 28.Kf3 Qxf2+ 29.Ke4! Qe2+
White were more in trouble if 29...Re1+ 30.Kd5!, and after Nf6!? 31. Rxf6 gxf6 32.Qxf6 Qxf6 33.Bxf6. How one can estimate an ending in view? White's Bishops are very strong, but it has no men, so Black's chances for a draw are approximately equal, as White's for winning.
30...Rd1+!? A better chance. 31.Kc4 Kxf7! 32.hxg4 Ke8 with slight superiority (it is indicated by A.Khalifman).
Now the struggle is ended quickly.
30:Rf1+ 31.Kg5 h6+ 32.Kg6 Ne5+ 33.Qxe5 Rg1+ 34.Qg5 Qxb2 35.Rxg7+ 1-0
Commentaries to the game are taken from the book by S.Ivanov and others "Chess Week of St.Petersburg. Championships of the city. St.Petersburg, 2003, p288с.