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Viktor Korchnoi vs Henrique Mecking
Korchnoi - Mecking Candidates Quarterfinal (1974), Augusta, GA USA, rd 13, Feb-13
Benoni Defense: Classical Variation. Czerniak Defense Tal Line (A77)  ·  1-0

8
7
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2
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1
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h
White to move.
ANALYSIS [x]
Notes by Stockfish 9 v010218 (minimum 6s/ply)12.f4 was played in M Loiterstein vs A Hoffman, 1999 (1-0)better is 12...Bg4 13.Bb5 Bd7 14.Be2 Bg4 = 0.00 (35 ply) ⩲ +0.58 (19 ply) after 13.Rb1 h6 14.Bb2 Ng6 15.Nc4 Nf4 16.a4 a6 17.a5 Qe7 13...a6 14.Nd1 Ng6 15.Re1 Nf4 16.Ne3 b5 17.a4 Nxe2+ = +0.15 (20 ply) 14.Rae1 Nh5 15.g3 Bd7 16.Nd1 Qg5 17.f4 gxf3 18.Nxf3 ⩲ +0.96 (20 ply)= +0.09 (21 ply)better is 16...Bd7 17.Bxd7 Qxd7 18.Ne3 Nfd3 19.Nf5 Nxb2 20.Nxg7 = +0.30 (24 ply) 17.Bf1 Qg5 18.Rb1 Qh6 19.Ne3 Re8 20.b4 cxb4 21.Nec4 Nxc4 ⩲ +0.93 (21 ply)= -0.14 (23 ply) 18.Bf1 Ned3 19.Bxd3 Bxb2 20.Rab1 Bd4 21.Bf1 Bd7 22.g3 = +0.22 (24 ply) ⩱ -0.91 (26 ply) 19...Nf3+ 20.Nxf3 gxf3 21.g3 Bxb2 22.Qxb2 Qxf5 23.Re3 ⩱ -0.81 (24 ply)= 0.00 (28 ply)better is 25...Qxf5 26.Bxf5 Rae8 27.Rxe8 Rxe8 28.Bxg4 Nxd5 29.Kf1 = +0.14 (27 ply) ⩲ +0.77 (22 ply)better is 28...b5 29.Rxd4 cxd4 30.Qxd4+ Kg8 31.h4 Rfe8 32.Rd7 Qg6 = +0.22 (19 ply) 29.Qh3 Qxh3+ 30.Kxh3 b6 31.f4 Kg7 32.Rde1 Rh8+ 33.Kg2 a5 ⩲ +0.93 (21 ply)= 0.00 (24 ply) 31...a5 32.Re1 a4 33.bxa4 Rxa4 34.Rxe5 dxe5 35.d6 Rd4 = +0.08 (19 ply) ± +1.57 (23 ply) 32...Qh7 33.Re7 Rf8 34.Rxa7 Rg6 35.Re4 Rf6 36.Qe3 Bd4 ⩲ +0.97 (23 ply)+- +2.94 (24 ply)better is 34.Rxa7 Qb1 35.Rg4 Rxg4 36.Qxg4+ Qg6 37.Qxg6+ fxg6 +- +2.85 (25 ply) 34...Rxg4 35.Qxg4+ Qg6 36.h3 Bxg3 37.Kxg3 Kh7 38.Rxa7 ± +2.03 (25 ply)+- +17.90 (26 ply)+- mate-in-3 after 38.Qg5+ Kh7 39.Qh6+ Kg842...Qxf2+ 43.Kxf2 Ke5 44.Ke3 Kf6 45.Qg7+ Kf5 46.Rf7# +- mate-in-41-0

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
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Kibitzer's Corner
Nov-25-03
Premium Chessgames Member
  Benzol: Doesn't 40.Qh6 mate immediately. What am I missing?
Nov-25-03  technical draw: I dont' think you're missing a thing, but Korchnoi certainly did.
Nov-25-03  Spitecheck: Zeitnot
Nov-25-03  technical draw: Time trouble or not, he's still Korchnoi.
Nov-25-03  Spitecheck: I think Korchnois perpetual (habitual) time trouble cost him the world championship (acquiring). Fair enough he might be slower than Karpov and his mates. But there is such a thing as sensible management of the clock. There's not point playing near perfect moves for 30 odd moves then when you're flag's on a precipice play an absolute sham of move that costs the game. Atleast in this game the small blunder only mean't he had to wait longer to have a vodka after the game finished.

Spitecheck

Nov-25-03  tud: Let's not be sure he did not have a vodka before the game. In Bucharest tournament in the 60s he played drunk from round 1 to round 15, having a hat on his face to mask his eyes (the scent was however there). He did 13.5 out of 15. Probably the most interesting character in chess after Bobby.
Nov-25-03  Resignation Trap: This turned out to be the last game in the match. Mecking's move 19...Ned3? was a crucial error. Instead 19...Nf3+! was the right continuation.
May-01-04  vonKrolock: the Korchnoi i meet personally in 1979 was a tee or coffee drinker but a chain-smoker (once he smoke all his available cigarettes in a session, plus one that i offered him in the entrance-hall, while commenting something about the game whith him...
Feb-27-05  vonKrolock: Look also at Gligoric vs Book, 1948 and <capanegra>'s Game Collection "When masters overlook mate"
Dec-27-05  syracrophy: In the move 40. I suggest the simple and winning 40.Qh6++.....it's a hard move to see, is it?
Dec-27-05  HannibalSchlecter: I once read an interview with Korchnoi and he was asked what his secret was to being so unusally strong for his age, and he replied something like "I do have a secret but I'm not going to tell you." It's a pity because if he does have such a secret it would benefit many many people, not just chess players.
Jul-04-06  gmgomes: Korchnoi about this game....

In this altogether nervy match, the 13th game proved to be the most tense and nervy of all. Mecking, as black, played for a win. It may have been possible but I did not manage to punish such a treatment of the opening. He gained the advantage, and the storm clouds began gathering over the white position. A critical point was reached, where Mecking had several tempting continuations. Among them was one which, after a forced variation, led to a position with an extra pawn for him. I don't know what Mecking saw at the board - after the game we weren't up to discussing it - but possibly, after a series of unsuccessful attempts in the match to realize the advantage of an extra pawn, he had ceased to believe in his technique, and decides that he must take me 'alive'. After lengthy consideration (during which time I had to sit with a neutral expression on my face, as if my position was not in fact hopeless) of all the possible continuations Mecking chose to try to increase the pressure. This proved inappropriate and I succeeded in equalizing and since my opponent persisted in playing for a win, I seized the initiative, and won with a mating attack. Only one hour earlier, the result of the match had been unclear, and suddenly it was all over. Both Mecking and I were dissatisfied with the result of the match, and we were both justified in being upset. Throughout the match Mecking had outplayed me; the reasons for his defeat were lack of experience against strong opposition, and inadequate technique. To me, on the other hand, it was clear that, with the standard of play that I had just demonstrated, I wouldn't go far."

Does anyone knows when Mecking could have got the extra pawn?

Jul-04-06
Premium Chessgames Member
  offramp: Kortschnoi was upset when Mecking arrived for the game wearing a 'Café do Brasil' T-shirt. He said he thought about wearing a 'Drink Vodka Mockva' T-shirt in retaliation.
Aug-30-06  Albertan: <gmgomes: Does anyone knows when Mecking could have got the extra pawn?>

As Resignation Trap pointed out above the move 19...Nf3+! was better than 19...Ned3? because Black wins a pawn after:

19... Nf3+! 20. Nxf3 gxf3 21. g3 Bxb2 22. Qxb2 Qxf5 (White cannot play 23.gxf4?? because of 23...Qxg4+ 24.Kh1 (24.Kf1 Qg2#) 24...Qg2#).

In this game Korchnoi missed a forced checkmate starting on move 38 with 38.Qg5+ the game would have ended after ..

38. Qg5+ Kh7 (38... Kh8 39. Qh6+ Kg8 40. Ne7#) 39. Qh6+ Kg8 40. Ne7#)

Dec-07-08  WhiteRook48: 4 checks in a row!
May-20-09  WhiteRook48: maybe Korchnoi wanted a better finish
Sep-24-20  chessperson2222222: Here's another one where Korchnoi missed a mate in 1- he missed Qe1# on move 51. Interestingly, he covers this game in one of his books and doesn't even acknowledge this.

https://old.chesstempo.com/gamedb/g...

Jul-29-23  Saniyat24: Mecking mistake giving away victory...!
Apr-07-25
Premium Chessgames Member
  Knighthawkmiller: 34.Rh4 there may follow +2.83 (26 ply) 35...Rg5 36. Rg4 Rxg4 37. Qxg4+ Qg6 38. Qxg6+ fxg6 is also a rasonable response.

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