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Milko Bobotsov vs Atanas Stefanov Kolarov
Varna (1971)
Queen's Indian Defense: Kasparov Variation (E12)  ·  1-0
ANALYSIS [x]

FEN COPIED

Annotations by Milko Bobotsov.

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+ sac: 15.Bxg6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Mar-18-07  benlude: After 16. ... Ne4. Im thinking of this: 17. Nxe4 Bxe4 18. Qxe4 Bxg5 19. Rxg6+ fxg6 20. Qxg6+ Kf8 21. Rxg5 Ke7 22. c5! (?) bxc5 23. Qg7+ Kd6 24. Qe5+ Kc6 25. Qxc5+ Kb7 26. Qb4+ Qb6 27. Rb5 Comment this please!
Mar-18-07  Billy Ray Valentine: <al wazir> I came up with the exact same lines you did (15. Bxf6 Bxf6 16 Rxh7 etc.) and thought I had solved the puzzle until I checked out the game... Guess I should have spent more than a few minutes on a Sunday puzzles.
Mar-18-07  WickedPawn: If 19. Kh8 then Bg7+! followed by ++.
Mar-18-07  goodevans: After 16. ... Ne4, does simply 17. Bxe7 followed by 18. Nxe4 give white enough attack? I have to admit that I'm usually out of my depth with these Sunday puzzles!
Mar-18-07
Premium Chessgames Member
  OhioChessFan: I've been playing with that, <goodevans> Here's the best I can find: 16....Ne4
17. Bxe7 Qxe7
18. Nxd4 Bxd4
19. Qc3
And the a1 diagonal looks strong. I can't find a good play for Black, though that doesn't mean anything.
Mar-18-07
Premium Chessgames Member
  OhioChessFan: Looking some more, with the piece up, 19...f6 might be sufficient.
Mar-18-07  kingsbishop304: Do you thing that 14...h5 could have saved black?
Mar-18-07  get Reti: <Al Wazir> 15...fxg6 16.Rh6 Kf7 17.Bxf6(It has to be on move 17 I think, threatens Rxh7+,Qxg6+, etc.)Kxf6 and the king is easily hunted down with 18. Rxg6+ Ke5 19. Qd3 Bg5 20.f4+ Bxf4 21. Qd4+ Kf5 Qxf4#
Mar-18-07
Premium Chessgames Member
  paulalbert: Good Sunday puzzle, which I couldn't solve correctly ( I wrongly thought Bxf6 was probably the start ). It's as Emanuel Lasker suggests, the possibility of a combination is clearly there: but it takes Emanuel Lasker or a GM, or even better a computer at the proper depth to explore all the move orders and defensive possibilities to separate the wheat ( if there is any! ) from the chaff.
Mar-18-07
Premium Chessgames Member
  playground player: I focused my attentions on Rxh7 instead of Bxg6. So many moves crying out to be made--and most of them are wrong. Add to the mix the fact that Black's replies are not forced, and you get a puzzle that's way over my head.
Mar-18-07  vesivialvy93: I found the first move 15.Bxg6 with 16.Bxf6 Bxf6 17.Rg6 then 18.Qxg6+ ....i thought the solution was aroud that ...better luck next time for me .
Mar-18-07  RandomVisitor: After 16.Rh6:
1: Milko Bobotsov - Atanas Stefanov Kolarov, Varna 1971


click for larger view

Analysis by Rybka 2.3.1 mp: 27-ply

1. (-0.89): 16...Ne4 17.Bxe7 Qxe7 18.Nxe4 Kg7 19.Rh3 Rh8 20.Qc3+ e5 21.Ng3 Kf6 22.Rxh8 Rxh8 23.Nf1

2. (0.43): 16...Be4 17.Nxe4 Nxe4 18.Bxe7 Qxe7 19.Qxe4 Qb4+

Mar-18-07  Marco5565: I was thinking of Rxh7 Kxh7 Bxg6 fxg6 Qxg6. Do you think White had any chance to force a mate?
Mar-18-07  anonymoose: I can't see the continuation if Black tries to block with 16...Ne4. Can someone help me out?
Mar-18-07  porc halal: 16 ..,Rh6 is wrong for black , analysis with fritz5 gives advantage after Bischop or knight to e4. so 16 ..,Be4 After exchange on g6 a couple of times there is a queen and a rook left on the g line but the rook has to take an interposing bishop first , which gives the king opportunity to escape via f8-e7-d6 Leaving white a rook down and lost. Or did I miss something?
Mar-18-07  Dr.Lecter: The killer move 15.Bxg6 was rather easy to find. It was the follow up which was harder to find.
Mar-18-07  MasterSavely: Doesn't
15.Bxf6 Bxf6 16.Rxh7 Kxh7 17.Bxg6 fxg6 18.Qxg6+ Kh8 19.Qg7++ Also Win?
Mar-18-07  brainzugzwang: Like a lot of you, I started with 15.Bxf6 to stop the possible interposition at e4, and also to clear the file for the Rg1. But after 15...Bxf6 16.Rxh7, what about Kf8 and trying to sneak away via e7?
Mar-18-07  micartouse: I knew the answer to this combo since by some strange coincidence I studied the game yesterday. If I hadn't studied the game, I certainly wouldn't have seen the full combo.
Mar-18-07  astaub: I explored the combination starting with 15 Bxg6 with the help of the chess program ChessMaster9000 supposedly playing at a rating of about 2670.

The program recommended 15 Kd2 indicating that it did not consider the sacrifice 15 Bxg6 to be correct. However, after 15 Bxg6 hxg6, it proceeded to win with 16 Rh6 Ne4 17 Bxe7 Qxe7 18 Nxe4 Bxe4 19 Qxe4 and proceeded to triple the heavy pieces on the h file.

I believe that the computer program Rybka improved on this defense by playing 18... Kg7 and moving the Black king rook to the h file to prevent the domination of the h file by White. My guess is that after this plan, Black has at least a draw and that the sacrifice was probably not correct, at least objectively speaking (over the board play may be a different matter, of course).

Mar-19-07
Premium Chessgames Member
  kevin86: Bobotsov plays a nice series of sacrifices to make this game come to its rapid conclusion. I especially like notes from players who are playing the game in question-they can be very instructive.
Mar-19-07  tor2ga: <OhioChessFan>: After your line -- up to 19.Qc3 -- e5 secures Black's position.
Mar-22-07  black knight c6: Wow so we have to effectively solve this puzzle with a precarious 12 moves in depth thought, with hardly any checks involved. Now THATS what I call tough. <RandomVisitor> Would you be kind enough to tell what rybka thinks after the line presented in commentary? E.G from your position, 16...Be4 17.Nxe4 Nxe4 18.Bxe7 Qxe7 19.Qxe4 Qb4+20. Kf1 Qxb2 - here does rybka agree with Rg3? If it does, does resulting lines have the advantage for white or black!? or what would the best line after Qxb2 be and who can be said to be winning maybe 5 or so moves after this? Many thanks if you could.
Apr-06-07
Premium Chessgames Member
  crafty: 16...♘e4 17. ♗xe7 ♕xe7 18. ♘xe4 ♗xe4 19. ♕xe4 ♕b4+ 20. ♔f1   (eval -1.19; depth 14 ply; 500M nodes)
Apr-07-07  black knight c6: thats interesting... Crafty thinks 19. Qex4 and after white is losing, the annotations think 19. Qxe4 and white is winning, and RandomVisitor's Rybka thinks black should play 18. ... Kg7. :S
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