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Florin Gheorghiu vs Viktor Korchnoi
Palma de Mallorca (1968), Palma ESP, rd 12, Dec-07
Queen's Indian Defense: Classical. Traditional Variation Main Line (E19)  ·  0-1

8
7
6
5
4
3
2
a
1
b
c
d
e
f
g
h
White to move.
ANALYSIS [x]
Notes by Stockfish 9 v010218 (minimum 6s/ply)better is 13...Na6 14.Qc2 Nb4 15.Qb1 Nc6 16.e3 cxd4 17.exd4 d5 = -0.01 (22 ply)better is 14.d5 exd5 15.Bxf6 Qxf6 16.Nh4 Re8 17.Rac1 Nc6 18.cxd5 ⩲ +0.52 (24 ply)= 0.00 (27 ply)better is 15.Kxg2 Nc6 16.Nf3 cxd4 17.Nxd4 Bxd4 18.Bxd4 Nxd4 = +0.19 (26 ply) 15...Nc6 16.d5 exd5 17.Bxf6 Qxf6 18.Qxd5 Nd4 19.Kf1 Nc2 ⩱ -0.53 (27 ply)= +0.30 (25 ply)better is 21...f5 22.Qb1 bxc4 23.Nxc4 d5 24.Nb6 Rc7 25.Rc2 Rb8 = 0.00 (28 ply) ⩲ +0.71 (26 ply) 30...Qb8 31.Re3 Na5 32.Rb1 Nc4 33.Rd3 Ne5 34.Rd4 Nc6 = +0.21 (25 ply) ⩲ +1.50 (24 ply) 33...Qa8 34.Qf6 Rf8 35.Qc3 Qc8 36.R7d6 Ne7 37.Qxc8 Nxc8 ⩲ +1.09 (23 ply)+- +2.53 (25 ply) 35.R7d6 Qa7 36.Ne3 Nb4 37.Qd4 Rb7 38.Qxe4 Na2 39.Qc2 Nb4 ± +1.89 (26 ply)= +0.17 (30 ply)better is 36.Nd4 Rxd7 37.Rxd7 Qe5 38.Qxe5 Nxe5 39.Rd6 Ra8 40.Kf1 ⩲ +0.58 (26 ply)= -0.17 (28 ply) after 36...Rfxf7 37.Qxg6+ Rg7 38.Qxe6+ Rbf7 39.Ne3 Ne7 40.Nd5 better is 38...Rff7 39.Ne3 Ne7 40.Nd5 Nf5 41.Rd7 Qf8 42.Nf6+ Kh8 ⩱ -0.69 (23 ply) 39.Qd5 Qa7 40.Rh6+ Rh7 41.Rxh7+ Kxh7 42.Qxh5+ Kg7 = -0.08 (29 ply) ∓ -2.36 (32 ply) 40.Kh1 Qf4 41.Qh6+ Qxh6 42.Rxh6+ Kg7 43.fxg3 Kxh6 44.Nd4 ∓ -2.17 (30 ply)-+ mate-in-543.Ke2 Qf3+ 44.Kd2 Rd1# -+ mate-in-20-1

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
FEN COPIED

Annotations by Stockfish (Computer).      [35434 more games annotated by Stockfish]

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Kibitzer's Corner
May-28-05  Caissanist: Could Korchnoi really have calculated 19 moves ahead when he played 20..b5? It's hard for me to believe that a human mind can do that. Yet if you take a look at any position before 39 .. Rxg3+ it seems like black is getting slaughtered, at least until you calculate it out.
May-28-05
Premium Chessgames Member
  beatgiant: <Caissanist>
I think Black was getting slaughtered.

What if White plays 35. b4! instead of the game line? If 35. b4 Nxb4 36. Nxb4 Rxb4 37. Rd8 wins immediately (e.g. 37...Qb6 38. Rxf8+ Kxf8 39. Rd8+), and otherwise White simply keeps advancing the queenside passers while still keeping much more active pieces.

May-30-05  Caissanist: bg - thanks, your analysis is quite convincing. I wonder what on earth Korchnoi was thinking when he embarked on the combination beginning with 20..b5. I sort of assumed that he knew what he was doing, I guess that was a wrong assumption.
Sep-11-21  Murky: If White plays 35. b4 Black's reply is 35...Qe5, and after 36 Qxe5 Nxe5 White is only slightly better. White's 2 Qside pawns do not roll forward so easily. Korchnoi was not "getting slaughtered" as was suggested in an earlier post.
Sep-12-21
Premium Chessgames Member
  fredthebear: Stockfish indicates 35.R1d6? was a case of the wrong rook. White collects three pawns and a knight for the rook sacrifice 36.Rxf7, but leaves Black a massive counterattack.

Man, what HEAVY ARTILLERY!!

Jun-23-24
Premium Chessgames Member
  WTHarvey: Black mates in 4.


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