E Hf re g

After 86...2xg4 87 e7 figl the already familiar 88 2b4 would follow.

87 fib8 Black resigned.

Let us now return to the position which could have occurred after 65...f5 66 gxf5+ &xf5 67 g4+ ^g6.

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White wins in the following way:

68 2hl 2e8 O 69 Ibl @ 2e7 © 70 e4 2d7 © 71 2dl © 2c7 ©

72 d5! cxd5 73 exd5 fixc5 74 d6 Sc8

75 <±>e4 &f7 © 76 ^e5 Se8+ © 77 £>d5 2h8 78 2el h5 79 d7 hxg4

O 68...2f8+ 69 4>e4 2f7 70 <ie5 2e7+ 71 9t?d6 2xe3 72 Sbl 2e4

73 2xb7 2xd4+ (73...2xg4 74 d5 cxd5 75 c6) 74 <^xc6 Sxg4 75 2 b6! and so on. Instead of 70 "¿>e5, also possible was 70

If 69...2e8+ 70 3?d3 2f8 71 Sbl Sf7 72 e4 h5 73 gxh5+ ^>xh5 74 d5 cxd5 75 exd5 g4 76 «¿>e4 g3 77 <4>e5 <^g4 78 ri?e6 2f2 79 d6 with an easy win. Or 74...g4 75 d6 g3 76 e5 <4>g4

77 2gl! (77 e6? would be a serious error; after 77...2f3+ the white king can hide from the checks only on al, but then ...g3-g2 leads to a draw) 77...(;i?f5 (77...2f3+ 78 <i>c2 2f2+ 79 sfc»cl and the white pawns are irrepressible)

78 2fl+ it?g6 79 2xf7 g2 80 2f8 <^g7 81 d7 gilt 82 d8W and Black has no perpetual check. Finally, (after 69... 2e8+ 70 <4>d3 2f8 71 Sbl 2f7

72 e4) mention should be made of 72...2d7, when there would follow

73 e5 2f7 74 e6 2e7 75 d5 cxd5

76 9t?d4 2xe6 77 2b6 2f6 78 Ec6 79 &xd5 h5 80 2xb7 2f6

© If White plays 69 e4 immediately, then 69...2f8+ 70 ifc>e3 Sf4 is possible, with serious counterplay, for example: 71 2bl 2xg4 72 2xb7 2g3+ 73 4>e2 g4 74 2b6 <4>g5 75 Bxc6 <4>f4.

© 69...h5 70 gxh5+ <à>xh5 71 2xb7 g4+ 72 <É>f4 2f8+ 73 ^e5 g3 74 2g7. The activity of his king ensures a win for White.

© If 70...2c7, then 71 2dl is strong, with the intention of playing d4-d5 after 71.. .h5 72 gxh5+ '¿,xh5, as well as after 71...Sf7+ 72 <4>e3 2f4. Or, in the event of 70...h5 71 gxh5+ <4>xh5 72 d5, variations similar to those in note © arise.

© The best. 71 <i»e3 or 71 d5 is less convincing.

® 71...$f6 72 <É>e3 <È>e6 73 2bl 2h7 74 2b6 2f7 75 d5+ <&e5 76 d6 2f4 77 2b4 or 76...h5 77 gxh5 g4 78 2bl and White wins.

© Or 75...<4>f6 76 <É>d5 2d8 77 2fl+ <à>g6 78 2bl.

© 76...2c5+ 77 2d5 2xd5+78 <4>xd5 &f6 79 &d4! <àe6 80 <4>c5 h5 81 gxh5 g4 82 <£>d4 and White wins, or 76... 2 g8 77 2bl 2b8 78 <£f5 <i>f8 79 <à>e6 2e8+ 80 <S?d7 2e4 81 2xb7 or 81 2 fl+ with the same result.

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Karpov - Korchnoi Vienna 1986

This position, reached after White's 41st move, is a complicated ending with many possibilities for both sides. So let us be lenient on the grandmasters, who committed a number of errors playing this position, especially as the time control was 50 moves in two and a half hours, and each-player had only a few minutes left on his clock...

Let us assess the position: White is a pawn up, and he has an active rook and a fairly active king. The black king, on the contrary, is rather passively placed. Black's hopes of saving the game are associated with the limited material on the board; also, White does not yet have any dangerous passed pawn, and his king is still a long way from the kingside. Black therefore hopes to eliminate the white pawns on the kingside - to ex change them for the black e- and f-pawns, after which a draw is of course unavoidable. But even so, the black position is, to put it mildly, alarming...

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