Kortschnoj,Viktor - Spassky,Boris V [D31]
Candidates final Kiev (6), 1968
[lk]

1.d4 d5 2.c4 e6 3.Nc3 Be7 4.cxd5 exd5 5.Bf4 c6 6.Qc2 g6 7.0-0-0 Nf6 8.f3 Na6 9.e4 Nb4 10.Qb3 Be6 11.e5 Nd7 12.a3 a5! 13.axb4 axb4 14.Nb1 [After 14.Nce2 c5 15.Nh3 c4 16.Qe3 Nb6 black has a powerful attack.]

14...c5 15.g4 c4 16.Qe3 Ra2 17.h4 Qa5 18.Rh2 Ra1 19.Bd3 b3 20.Ne2
Black gets back the piece a should win.

20...Bb4
[Mikhail Tal recommended 20...cxd3 21.Qxd3 h5 ; Other good moves are: 20...Nb6 ; 20...0-0 ]

21.h5 0-0 22.hxg6 fxg6 23.Rdh1 cxd3 24.Qxd3 Qc7+ 25.Nec3 Nb6?
[25...Bxc3! 26.bxc3 (26.Qxc3 Qxc3+ 27.bxc3 Rxf4 28.Rxh7 Nf8-+ ) 26...Rxf4 27.Qxg6+ Kf8-+ ]

26.Qxg6+! hxg6 27.Rh8+ Kf7 28.R1h7+ Ke8 29.Rxf8+ Kxf8 30.Rxc7 Nc4 31.Rxb7 Bxc3 32.bxc3 b2+ 33.Kc2 Ke8 34.Bg5 Ra6 35.Nd2 Bc8 36.Re7+ Kf8 37.Nxc4 dxc4 38.Kxb2 Rb6+ 39.Kc2 Bb7 40.Rxb7 Rxb7 41.f4 Rh7 42.Kb2 1-0