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Viktor Korchnoi vs Miroslav Filip
Stockholm Interzonal (1962), Stockholm SWE, rd 8, Feb-07
English Opening: Symmetrical Variation. Hedgehog Defense (A30)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Given 4 times; par: 62 [what's this?]

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sac: 32.Bxg7 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
May-11-03  Fulkrum: Is this a combination or did black just let the position slip? I plugged this into Fritz 8 (since I'm not a strong player) to get get some answers and had it annotate the game. Fritz liked 30. .. dxe5 31 Rxd8 Nxd8 32. Qxd8 Ra1 with a slight advantage for black.
May-11-03
Premium Chessgames Member
  chessgames.com: It's a combination, and a very difficult one. This problem was taken from from "Anthology of Chess Combinations", Second Edition, (c) 2002 Sahovski Informator (Chess Informant), which presents the following analysis:

32. ♗g7! ♗g7 [32... ♗e4 32.♗f8 ] 33. ♘h6 ♗h6 [33...♔f8 34.♘g5! ] 34.♕h6 ♗e4 35.♖e3 d5 [35...♗h7 36.♘g5 ♘g5 37.♕g5 ] 36.♘g5 ♕e5 [36...♘g5 37.♕g5 ♔h8 (37...♔f8 38.h6 ) 38.♗e4 dxe4 39.♕f6 ♔g8 40.h6 ] 37.♖e4! ♕g5 [37...dxe4 38.♕h7 ♕f8 39.♕f7#] 38.♖e6! ♕h6 39.♖h6 ♖a4 40.♖b6 ♘d4 41.♖c5 1-0

May-11-03
Premium Chessgames Member
  Calli: I am with Fulkrum on this one. Can't see anything for White in the line he gives. Does Chess Informant cover 30. .. dxe5 ?
May-12-03
Premium Chessgames Member
  Calli: Yes, 32 Bxg7! is great and its very difficult to see to the end. White's combo, however, began with the sacrifice(?) 30. Bxe5?! . Fullkrum's question is whether this move is sound. Fair question since the Bishop can never go to g7 if Be5 is not played first.
Jun-27-04
Premium Chessgames Member
  patzer2: This combination (32?) is also listed as number 1666 in Chess Informant's "Encyclopedia of Chess Middle Games/Combinations," 1980 edition.

The 2002 informant analysis posted above by ChessGames.com is essentially the same as that in my 1980 edition. Hopefully, 32. Bxg7! was computer checked and is sound. Although it might be interesting to research 30...dxe5!?, I am primarily concerned with the soundness of 32. Bxg7!

In any event, this combination with 32. Bxg7! is a good example of the tactical theme "demolition of pawn structure" via "sacrifice on g7." In this case, Korchnoi is essentially simplifying to a won ending.

Jul-29-06  chessmoron: <patzer2:In any event, this combination with 32. Bxg7! is a good example of the tactical theme "demolition of pawn structure" via "sacrifice on g7." > And this is why is today's play of the day.
Jul-29-06  pebble767: I saw the first few moves but I didn't know how to continue =(
Jul-29-06  makaveli52: i got it im happy. Didnt calculate whole line, didnt even try to, but got first 3 moves right, and saw that theres a strong attack in all variations
Jul-29-06
Premium Chessgames Member
  dzechiel: Saw it all in a few seconds. NOT! It's not clear to me that there were forced lines at all. Perhaps one of you with some serious chess software can tell if Korchnoi's line was best or even winning in all or most variations.
Jul-29-06
Premium Chessgames Member
  jahhaj: 32.Bxg7 looked like the move, but I didn't see much after that.
Jul-29-06  coolzadar: I saw Bxg7 immediately but only as one of those "gut feel" sacrifices aimed at exposing the King and hoping for the best!
Jul-29-06
Premium Chessgames Member
  jahhaj: <dzechiel> Computers do say that White is better in all variations. If Black defends well he keeps his extra material but his king is so exposed and he's so many pawns down that the computer gives a better assessment for White. For instance after

32.Bxg7 Bxg7 33.Nxh6+ Bxh6 34.Qxh6

Black could try

34...Rd7 (aiming for Qf8) 35.Ne5 (threatening Ng4-f6) 35...Qf8 36.Qxf8+ Nxf8 37.Nxd7 Nxd7 with a better endgame for White (according to computer)

or

34...Rc8 35.Re1 Rc7 (again aiming for Qf8) 36.Ng5 (preventing Qf8 and threatening Nh7-f6) Nf8 37.Nxf7! Rxf7 (37...Kxf7 38.Qg5 followed by either Qxb5 or Rf3+ is worse for Black) 38.Qg5+ Kh8 39.Qxb5 Black still has his extra piece but he's four pawns down and his king is exposed.

Jul-29-06  EmperorAtahualpa: I did have a knight-bishop sac in mind, but was thinking of first moving Nxh6. And I also had no idea of how to continue. So in short, I didn't get it all. :(
Jul-29-06  Tariqov: i too pick 32.Bxg7(Trusted my intuition and a little calculation),but i calculated that after 32...Bxg7 33.Nxh6!Kf8 i chose Nxf7? thinking white only sac 1 piece,but it looks kind of nice,can anyone check whats wrong with it? i thought of 35..kxf7 36.Ng5+Nxg5 37.Qxg5Nc7 38.Rf3+ and stuff like the variation i pointed out and just trusted intuition, exposed king and passed pawn(h pawn).
Jul-29-06
Premium Chessgames Member
  kevin86: A nice finish! There's no way I can or could have seen the pieces fly in this one. Definitely worthy of a Saturday puzzle.
Jul-29-06  eainca: What I find interesting is that at move 30 only pawns are off the board. No minor pieces fall until Bg7.
Jul-29-06  builttospill: I didn't completely solve this, but I saw up to 34. Qxh6 and figured it would lead to a strong attack on the king after Ng5. I didn't look at all the possible moves for black, though, and I don't think i'd have the balls to play this in a real game. Trying to see beyond 3 moves hurts my brain.
Jul-29-06  Chess Lou Zer: Wow! That is some chess puzzle! There's no way I could have seen that in a thousand years! Are they always that hard? My first post on this fantastic site, by the way. Hi everybody!
Jul-29-06  Tariqov: Hello, not it isn't it depends what day it is.(Monday-easy but Sunday-Super hard)and it grow harder and harder until Sunday and goes back becoming easy(monday).
Mar-06-08  vescovifan: Can someone explain why 37. Bxe4 isnt better than Rxe4? i've been looking at it for hours.. theres probably an in between move im missing

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