Korchnoi - Kasparov, Olympiad, Lucerne 1982

After 23...Qb6-b2(xP)

After 23...Qb6-b2(xP)

24.fxe5. White finally captures the Knight (Kasparov: 'At the least suitable moment!'), which has been en prise for seven moves. Korchnoi undoubtedly overlooked that trapping the Queen with 24.Rfb1 is refuted by Nf3+!. If 24.Ra2, then 24...Qb8. Better might be 24.Nc2 Qb8 25.fxe5 Rxf1 26.Rxf1 Bxe5 27.Rf3.

24...Bxe5 25.Nc4. Forks the Queen and Bishop, but Black has a counterblow. 25...Nxg3! 26.Rxf8+ Rxf8 27.Qe1 Nxe4+ 28.Kg2 Qc2. 28...Rf2+ 29.Qxf2 Bxh3+ is faster, e.g. 30.Kxh3 Nxf2+ 29.Nxe5.

Index: Korchnoi - Kasparov, Olympiad, Lucerne 1982

1. Introduction
2. After 12...Ra8-b8
3. After 15.e2-e4
4. After 17.f2-f4
5. After 19...Na3-b5(xP)
6. After 22.Nb5-a3
7. After 23...Qb6-b2(xP)
8. After 29.Nc4-e5(xB)
9. After 32...Nf2-d3
10. Post Mortem