Yuri Averbakh vs Viacheslav Osnos (1965)

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Yuri Averbakh vs Viacheslav Osnos
USSR Championship (1964/65), Kiev URS, rd 12, Jan-13
Sicilian Defense: O'Kelly Variation. Normal System Kan Line (B28) · 1-0

ANALYSIS [x]

FEN COPIED

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Mar-15-06		AniamL: I was expecting something a little more dramatic.

Mar-15-06		WannaBe: Just a little too difficult for me, perhaps this was better as Sunday's puzzle?

Mar-15-06		Skylark: I got this. With puzzles, you have to keep in mind that the solution can range from as small a thing as a winning yet minor material advantage to as large a thing as checkmate. Generally when you keep an open mind to what it is you're actually looking for, it makes finding the best line a lot simpler.

Mar-15-06		inad: I got this one, the main point is that the black king has to go to e7 regardless and that will cause the b4 bishop to be forked.

Mar-15-06		melianis: Yes, saturday or sunday, thought that this puzzle would end with a winning exchange B vs. R, but couldn't find a way to do it, and neither did Averbakh :-).

Mar-15-06		RandomVisitor: 19.Nf6+ Nxf6 20.Bf3 also wins.

Mar-15-06		melianis: Are we supposed to prove that the rooks can't win against B+N+R ??

Mar-15-06		al wazir: <AniamL: I was expecting something a little more dramatic.> I agree. White gains an advantage that might be enough for a GM to win with, but it isn't overwhelming. My idea wasn't any better, but I don't think it's any worse either: 19. Nf6+ Ke7 (19...Nxf6 20. Bf3 Rg6 21. Bxc6+ 21. Ke7 Bxa8) 20. Nxd5+ cxd5 21. Bf3 Rg6 22. Bxd5 Rb8. White picks up a ♙, both his ♗s are active, and black's ♖ on b8 is all but trapped.

Mar-15-06		JeffCollier: gee whiz. Even with "White to move and black to resign in 30" as a hint this would have been past me.

Mar-15-06		ice lemon tea: i was looking for checkmate, but couldn't find it. took me longer than expected to finally find the solution. <melianis: Are we supposed to prove that the rooks can't win against B+N+R ??> no need to prove. it's already a well known fact that normally double rooks stand a very little chance to win against R+N+B in endgame.

Mar-15-06		blingice: Yes, this was indeed a dull, anticlimactic puzzle. I'm expecting to see FASCINATING and INTERESTING puzzles EVERY DAY, <CG.com>. :)

Mar-15-06		Monoceros: <ice lemon tea: it's already a well known fact that normally double rooks stand a very little chance to win against R+N+B in endgame.> Well, it's not well known to me. Most of my games don't get anywhere near that far :( Is there an example in the database of such an endgame?

Mar-15-06		Capa15: 49. ... Rd8 50. Nd6+ and then Nc8 if not 50. ... Rxd6

Mar-15-06		peterk007: Posed as a puzzle it is not thaaat difficult. White can do only few dramatic moves, RxN is the most obvious. It frees f6 for the white N. Then thinking starts what to do with that. - In an OTB game, just to seriously consider this move, that's what I find damned difficult.

Mar-15-06		Hongkonger: Remarkably (for me) I got this one very quickly - but to be honest only because following the previous puzzles I was looking for a way of luring the Black king into knight forks.

Mar-15-06		majick: I got this as well - saw all the lines (even though it took me some minutes, but the first move, the exchange sacrifice, was really obvious to me), black's king will always end up on e7 to prevent even worse things (greater material losses) and that will invite White's knight to do that King and Bishop-fork. A little tricky for a Wednesday to see that the king won't really have any escape but great puzzle nontheless, chessgames.com!

Mar-15-06		wzeller: This is a pretty cool puzzle. After 19. rxd5! cxd5 20. nf6+ black will be forced to go to e7 regardless of where the king tries to retreat. As well as the line black took in the game (20. ... kf8), 20. ... kd8 also loses because white has 21. bb6+ ke7 22. nxd5+ forking the bishop. The key to this puzzle was seeing the final fork and that black's king can be forced to move to e7 -- a little tricky for a Wednesday puzzle but pretty forcing once you see the final position.

Mar-15-06		Soltari: Solved, but took pretty long. And if I can solve it, this puzzle is too easy for a saturday or sunday :).

Mar-15-06		Cryptic: <RandomVisitor: 19.Nf6+ Nxf6 20.Bf3 also wins> This is the line I saw too. I am surprised no one has commented for or against !?

Mar-15-06		OhioChessFan: What to do after 20...Kd8 was the only move I had to work at a little. The position after Nxb4 I passed off as winning for White, even though I would have a hard time winning it.

Mar-15-06		latebishop: Like RandomVisitor and Cryptic I also found 19.Nf6+. I didn't actually see the line Averbakh played. If 19...Kf8 (say) then 20.Nxd5 cxd5 21.Rxd5 f6 22.Bf3 looks very strong.

Mar-15-06		MaxxLange: Very logical combination! After move 18 White threatens mate in 2 with 19. Nf6 and 20 Bh6++. This works because the dark squares around the King are very weak. Black stops this threat with ...Nd5, shoring up those dark squares; so, chop off the Nd5.

Mar-15-06		ckr: Sorry to say that this point in the game it is unlikely that I would sac a rook for a knight when the fairly obvious Nf6+ line is available. Not to say the sac was a poor move, I considered it - but my mind immediately rejected it so I can't even say I looked at any of the games lines.

Mar-15-06		ckr: As it turned out the rook sac was excellent.

Mar-15-06		Fezzik: To our modern sensibilities, this may not seem terribly dramatic. However, this game serves as a precursor to understanding many of today's exchange sacrifices. (Topalov and his contemporaries in particular seem to have taken these lessons to heart.) This game was played before many of us were born, and yet it feels completely normal. Averbakh's sacrifice was spectacular precisely because it represents a great leap forward in our understanding of the relation between rooks and minor pieces. The great endgame virtuoso recognised as early as move 19 that the Black's Knight held Black's position together. He saw that by removing the centrally placed N+P for a rook, he was winning the game. Sure, it took him many more moves to prove his concept, but it was still "spectacular" both in 1964 and more than forty years later!

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