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Tom Wedberg vs Viktor Korchnoi
Haninge (1988), Haninge SWE, rd 8, May-??
French Defense: Classical. Steinitz Variation (C14)  ·  1-0

ANALYSIS [x]

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Given 32 times; par: 46 [what's this?]

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sac: 29.Qxg5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Apr-16-06  notyetagm: 21 ... ♕c7 threatens the diabolical <discovered deflection> 22 ... ♖xd4!. The tactical point is that the capture of the White d4-knight and White's subsequent recapture by the White d2-queen (22 ... ♖x♘! 23 ♕x♖?) removes not one but two(!) defenders from the c2-square, by <destroying> the d4-knight and <deflecting> the d2-queen.

Black would then have a classical back rank mate in three with 23 ... ♕xc2+ 24 ♔a1 ♕c1+! 25 ♖x♕ ♖x♖#. Hence White could in fact not recapture on d4 and would thus lose a piece for nothing.

Apr-16-06  notyetagm: My previous post is a good illustration of just how dangerous it is to defend with knights. <Knight defenders are often the basis of combinations using the REMOVE THE GUARD tactic.>
Mar-08-07  firefight: 35. Rf1+ Bf5 36. Rxf5+ leads to mate.
Feb-20-20
Premium Chessgames Member
  FSR: I just went as far as 29.Qxg5! Rxd4 30.Rg3! g6 31.hxg6 and concluded that Black wouldn't be able to survive the onslaught.
Feb-20-20  Granny O Doul: White does look pretty good there. For instance, 33. Qf6.
Feb-20-20  Walter Glattke: 29.e6!? allows Qg1+ later. 29.Qg5 Be6 30.h6 g6 31.h7+! wins, 31.-Kh8!? 32.Qf6+ Kxh7 33.Rh1# 31.-Kxh7 32.Rh1+ Kg8 33.Qf6 mate next 29.-f6 30.Qg6 Be8 31.Qxf5 Qe7 32.h6 g6 33.Rg1 Kh7 difficulty
Feb-20-20  saturn2: Black does not have to accept the sacrifice of the rook 29. Qxg5 Qb8 (Qb6 30 e6 wins) 30. e6 fxe6 31. Nxe6 Bxe6 32. Rxe6 Qf8 33. Re7 s- nd now?
Feb-20-20  saturn2: sacrifice of the knight
Feb-20-20  goodevans: <saturn2> If black refuses the N-sac white has plenty of other threats apart from pushing the e-pawn. Against 29...Qb8 he does better to focus on g7 first, e.g. <29...Qb8 30.h6 Qf8 31.Rg3 g6 32.e6>.
Feb-20-20  Lambda: If black has to play 29...Qb8, then 29.Qxg5 was clearly a good idea which has improved the white position.
Feb-20-20
Premium Chessgames Member
  offramp: Whereat Korchnoi said, "Well played, young man! You have taught me a lesson. I am always willing to learn from a superior. Go in peace."
Feb-20-20
Premium Chessgames Member
  chrisowen: Lamecore vinerung linerung qg5gecko gangvant reinvest rd4gecko dinkdang dunks it civvylung 29Qc5 reinvest dicerung ducklead clunkarm 4 it ok vowumump vimumump rg3gecko gangvant pg6gecko gangvant dunks its a 31.hxg6 reinvest resavow ladyrung ruggluv guffflag rebindum rebudums remater rehaver 9 resauldy ruggluv lamegore vinerung rejalopy its commotion reinvest ruggluv raggedit threwins vestibule yinyang yesrazit cavevint flipcox its minionus vestibule rehunger cavelung reinvest westritz poxcuffave its bionicvim qg5gecko gangvant reinvest resavow frackvam general negligent vintvant greenveg gunghoot guffrung gaffrung disguise twinkles totaddup changeum foodrung ievineum icicler geckobib its watches vestpave ruggluv lamecore qg5gecko gangvant?
Feb-20-20
Premium Chessgames Member
  chrisowen: Bridge?
Feb-20-20  saturn2: <goodevans> After your 29 ...Qb8 30.h6 Qf8 31.Rg3 <g6 > there is
32. Nxf5 Bxf5 33. Qxf5 Qxh6 34.e6 and the king is under attack
Feb-20-20  TheaN: Got this is one in its near entirety and have to be honest I'm happy with that. Though 30....g6 is a reasonable defensive idea, it's not what I pictured as main defense.

After <29.Qxg5!> White gives Black the choice of two evils in Rxd4 or otherwise defending against the attack immediately. The latter is stay of execution as White will be free to follow up with Rg1, Rg3 and even h6 and Black won't survive.

After <29....Rxd4> White has to be careful: Black isn't without threats. 30.h6? Rg4 -+ should be horrible and the careless 30.Rg1? Rg4 31.Rxg4 fxg4 and the back rank's undefended: 32.h6?? Qg1+ with mate. So we need a rook on the g-file and it isn't the first rank one: <30.Rg3>. From here on out, it plays itself.

I'd actually pictured Black still playing <30....Rg4> as 30....g6 looks innately lost. Granted, it may be better as after <31.Rxg4 fxg4 32.h6 g6> I saw <33.h7+!?>; practically it's worse, as of course after 33.Qf6 Kf8 34.h7! mates immediately, but after <33....Kxh7 34.Rh1+ Kg8 35.Qf6 +-> the only move that works against Rh8# is Qg1+, and at that point I was done; White still mates in 8.

Feb-20-20
Premium Chessgames Member
  agb2002: White has a knight for a bishop and two pawns.

The black castle looks weak and defenseless. Therefore, 29.Qxg5:

A) 29... Rxd4 30.Rg3

A.1) 30... Rg4 31.Rxg4 fxg4 32.h6 g6 (32... Kf8 33.h7 wins) 33.Qf6 Kf8 34.h7 and mate next.

A.2) 30... g6 31.hxg6

A.2.a) 31... f6 32.Qh6, followed by exf6 with the double threat f7+ and Rh3, wins.

A.2.b) 31... Kf8 32.g7+ Kg8 33.Rh1 f6 34.Qxf6 wins.

A.2.c) 31... Rg4 32.Rxg4 fxg4 33.Qf6 followed by Rh1 wins.

A.3) 30... Kf8 31.Qxg7+ Ke7 (31... Ke8 32.Qh8+ Ke7) 32.Qf6+ Kf8 (32... Ke8 33.Rg8#) 33.h6

A.3.a) 33... Qa6 34.h7 Qxf6 35.exf6 Rh4 36.Rg8#.

A.3.b) 33... Rg4 34.Rxg4 fxg4 35.h7 wins.

B) 29... Be6 30.h6 f6 (30... g6 31.Qf6 Kf8 32.h7 wins) 31.exf6 Rxd4 32.Rxd4 wins an exchange (32... Qxd4 33.Qxg7#).

C) 29... Qb6 30.e6

C.1) 30... Rxd4 31.h6 g6 32.Qf6 Kf8 33.h7 Rh4 34.Qxh4 wins.

C.2) 30... Bxe6 31.h6 as above.

D) 29... Be8 30.Nxf5 recovers the material with an overwhelming position.

E) 29... Bc8 30.h6 f6 (30... g6 31.Qf6 as above) 31.exf6 Rxd4 (31... Ba6 32.Re7 wins) 32.Re8+ Kf7 33.Re7+ Qxe7 34.Qxg7+ Ke6(8) 35.Qxe7#.

Feb-20-20  Diana Fernanda: Viva Venezuela
Feb-20-20  King.Arthur.Brazil: Firstly, I saw the sequence: 29. ♕xg5 ♖xd4 30. ♖g3 ♖g4 31. ♖xg4 fxg4 32. h6 g6 33. h7+ ♔xh7 34. ♖h1+ ♔g8 35. ♕f6 and the check mate is near. Since 33...♔g7} is even worst 34. ♕f6+ ♔xh7 35. ♖h1+ ♔g8 36. ♖h8# . However, after that, trying to improve black answers, I thought that was not a good idea to capture the ♘} immediately. I found the line: 29. ♕xg5 ♗e8 30. ♖g3 g6 31. e6 ♖xd4 32. exf7+ ♕xf7 33. hxg6 ♕g7. White keep on attack and black still fights to survive.
Feb-20-20
Premium Chessgames Member
  areknames: <29. ♕xg5 ♗e8 30. ♖g3 g6 31. e6 ♖xd4 32. exf7+ ♕xf7 33. hxg6 ♕g7. White keep on attack and black still fights to survive.>

After 29...Be8 Wedberg simply plays 30.Nxf5 f6 (forced) 31.exf6 and it's all over.

Feb-20-20
Premium Chessgames Member
  Breunor: Computer doesn't like 24... h6 which is where Korchnoi loses his advantage:

1) +0.55 (22 ply) 25.f5 exf5 26.gxf5 Rxd4 27.Rxd4 Bxf5 28.Ka1 Bxc2 29.Rc1 b3 30.Rxa4 Qxe5 31.axb3 Qf5 32.Ra3 Be4 33.Rxc8+ Qxc8 34.Ka2 Qb8 35.Ra4 Qe5 36.Qd4 Qxh2 37.b4 Qh1 38.Ra8+ Kh7 39.b5 Qf1 40.b6 f5

2) +0.23 (21 ply) 25.h4 Qd8 26.Rh1 Qb6 27.h5 Rc3 28.g5 Bb5 29.Rf3 Rxf3 30.Nxf3 b3 31.cxb3 axb3 32.gxh6 Qa6 33.a3 Be2 34.Nd4 Bd3+ 35.Ka1 Qc4 36.Rd1 Qxd4 37.Qxd3 Qxf4 38.hxg7 Rc1+ 39.Rxc1 advantage.

Better is Qc5:

1) -0.15 (25 ply) 24...Qc5 25.h4 Qe7 26.g5 Qc5 27.h5 Qb6 28.Ree3 Be8 29.Re1 Rc3 30.Ree3 a3 31.b3 R3c7 32.Re1 Qb7 33.Ka1 Bb5 34.Rh3 Ba6 35.g6 Rc3 36.Rxc3 bxc3

The losing move is 26 Ra8:

1) +2.11 (23 ply) 27.g5 hxg5 28.h6 a3 29.b3 Rc3 30.Rxc3 bxc3 31.Qe3 g6 32.fxg5 Qc5 33.Qf4 Qe7 34.Rf1 Rc8 35.Rf3 Be8 36.Ne2 Kh7 37.Rxc3 Rxc3 38.Nxc3 Qa7 39.Ne2 Qc5 40.Qf6 Qf8 41.Qd8

Holding the game is an immediate attack:

1) =0.00 (27 ply) 26...a3 27.b3 Rc3 28.Ree3 Rxd3 29.Rxd3 Qb8 30.Rg3 Kh7 31.Qd3+ Kg8 32.Qd2

2) =0.00 (27 ply) 26...b3 27.axb3 axb3 28.cxb3 R4c7 29.Rc3 Qa6 30.Rec1 Rxc3 31.bxc3 Bb5 32.Qa2 Qb6 33.Qd2 Qa6

Feb-20-20
Premium Chessgames Member
  mike1: best defence is not taking the knight.
28...a3 29. b3 Rxd4 30. Rxd4 exf5 is a hard nut to crack. 31. Rxd5 Bc6 is nearly even according to SF
Feb-20-20
Premium Chessgames Member
  areknames: <best defence is not taking the knight. 28...a3 29. b3 Rxd4 30. Rxd4 exf5 is a hard nut to crack. 31. Rxd5 Bc6 is nearly even according to SF> Not quite sure what you mean, in your line above after 29...Rxd4 White doesn't have to capture on d4 but plays 30.Qxg5 with a winning advantage.
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