Korchnoi vs. Hubner
Johannesburg 1981
Queens’s Indian Defense
1 e4 Nf6 2 c4 e6 3 Nf3 b6 4 Nc3 Bb7 5 Bf4 A distinctly unusual line. 5…Be7
6 Qc2 Nh5?! This loses time, and allows White to transpose into a
relatively favourable variation of the Queen’s Indian. 6…0-0 is better. 7
Bd2 d5 8 cxd5 exd5 9 g3 0-0 10 Bg2 Nf6 11 0-0
After 11 0-0
By means of an unusual move-order, we have reach a position
which more often arises after 4 g3 Bb7 5 Bg2 Bb4+ 6 Bd2 Be7 7 Nc3 0-0 8 0- 0 d5
9 cxd5 exd5 10 Qc2 (of course the move-numbers differ from one). This position
is thought to give White a slight advantage. 11…Re8?! A rather
artificial move. Of the various lines tried here, perhaps 11…c5 12 Rad1 Nbd7
offers the best chance of equality. 12 Ne5
After 12 Ne5
Coupled with Qb3, this set up a latent threat against f7 which
exploits the rook’s absence from f8. 12…a6 Black wants to play
…Ndb7 in a position where he can meet Qa4 by …b5, hence this preparatory move.
White is also better after 12…Nbd7 13 Qa4 Nxe5 14 dxe5 Ne4 15 Nxe5 dxe4 16
Rfd1, so 12…Bd6 was the best chance, intending to meet 13 Nc4 by 13…Be7. 13
Qb3 Nbd7 13…c5 14 dxc5 Bxc5 15 Nd3 favours White. 14 Rad1 b5
After 14...b5
15 Nxd5?! A
truly amazing combination. Objectively, it is not entirely correct, but it is
certainly hhard to find the correct reply from many plausible defenses.
Korchnoi recommended 15 Bg5 Nb6 16 Nd3, which is good enough for an edge, but
15 Bf4! Is probably objectively strongest. One variation runs 15…c6 (15…Nf8 16
e4 Ne6 17 exd5 Nxf4 18 d6! Nxg2 19 Nxf7 wins) 16 e4 Nf8 17 Nxc6! Bxc6 18 exd5
Bb7 19 d6 Bxg2 20 dxe7 Rxe7 21 Kxg2 and White has won a pawn in return for
minimal compensation. 15…Nxd5 16 Ba5
After 16 Ba5
The point of White’s play. By opening the d-file, White
threatens to take the d5-knight. 16 Bxd5 Bxd5 17 Qxd5 Nxe5 18 Qxd8 Bxd8 19 dxe5
Rxe5 is only equal. 16…N7f6?! 16…Bd6? 17 Nxd7 Qxd7 18 Bxd5
loses a pawn, and 16…N7b6 17 Bxb6 cxb6 18 e4 Bf6 19 exd5 Qd6 20 Nc6 is better
for White, so the best defense is 16…Bf6!. Then 17 f4 N7b6 18 Bxb6 (e4 Bxe5 19
dxe5 Nc4 20 Bc3 Nxc3! favours Black) 18…cxb6 19 e4 Qd6 (19…Nc7 is unclear after
20 Nxf7 Qd7 or 20 Qxf7+ Kh8 21 Qh5 Kg8) 20 exd5 Rad8 21 Nc6 Bxc6 22 dxc6 Bxd4+
23 Kh1 should be a draw. 17 e4 White’s threat is now so much
to take the d5-knight immediately, but rather to step up the pressure by Rc1
first. 17…Rc8 Black anticipates White’s attempts to exert
pressure along c-file. 18 Rc1!
After 18 Rc1!
Now White threatens to take on d5, when Black will be weak at
both c6 and c7. A further threat is simply to build up by Rfd1 before regaining
the piece. 18…Nxe4? Black panics and returns the extra piece
unfavourably. 18…Bd6! was best; after 19 exd5 Bxe5 20 dxe5 Rxe5 21 Bh3! Rh5 22
Bxc8 Qxc8 23 f3 Bxd5 24 Qc2 c6 25 Rce1 Black obviously has some compensation,
but it is not enough to compensate for his material disadvantage. 19
Bxe4 Now Black is in real trouble as c6 and f7 are serious
weaknesses. 19…g6
After 19...g6
19…Qd6 is no better, e.g. 20 Rc5 Rcd8 (or 20…c6 21 Bf5 Ra8 22
Bd7) 21 Rxc7! Nxc7 22 Qxf7+ Kh8 23 Bxb7 and wins. 20 Rc6! A
deadly move. One might have expected White to occupy the c6-weakness with his
knight, but the rook is even more effective as the knight can stay on e5 to
maintain the pressure against f7. 20…Nf6 The knight must move,
but now f7 collapse. 21 Nxf7 Qxd4 22 Ng5+ Kh8 23 Bc3 1-0 Total
destruction.
Source from:
GAMBIT: John Nunn’s 101 Brilliant Chess Miniatures (Pages 45 -
46)
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