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Viktor Korchnoi vs Artur Yusupov
Lone Pine (1981), Lone Pine, CA USA, rd 7, Apr-06
Slav Defense: Quiet Variation. Pin Defense (D12)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Apr-19-12  Memethecat: 37Rxf6 Kxf6 38Qd4+

38...Qe5 39Be7+ Kf5 39g4# or

38...Kf5 39e4+ Kg5 40Bd2+ Kh5 41Qg7 mate next

38...Kg5

I gave up here & looked, couldn't see the finish. A lot of work for Thursday, I was going back & forth between 37Rxf6 & 37Rxb6 Qxb6 38Qe8. Both are winning. Korchnoi obviously found the quickest/stylish route.

Apr-19-12  VincentL: "Medium".

I think 37. Rxf6 wins the bishop, since if 37.....Kxf6 I believe white can mate or else gain more material.

38. Qd4+. Now if 38.....Qe5 39. Qxb6 winning the knight as well.

So 38.....Kf5/Kg5 and now the pawns come into play.

38.....Kg5 39. f4+ Kh5 40. g4+ Kh6 41. Bf8# (or 39....Qxf4 40. Qxf4+ Kh6 41. Qg5+ Kh6 42. Bf8#).

38......Kf5. I cannot see the mate immediately in this line and must stop.

Let΄s check quickly.

Apr-19-12  ventricule: I also went for the Rxb6 line. Does anyone with an acute eye or a silicon monster have a refutation to it ?
Apr-19-12  LIFE Master AJ: I did not have time for the full routine this AM ... gotta get my child ready for school.

Looked at the position, and thought after maybe just a few seconds that the sack on f6 (37.RxB/f6) was correct.

However, I want to make it clear that this is a far cry from analysis!!! I spent 2-3 minutes looking, and I saw (maybe) a few hasty lines, but I don't consider this real analysis or problem solving.

The follow-up sack of the Bishop on e7 is exquisite, and I did not even consider that (didn't get that far) when I made the decision to sack on f6. However, I tell my students - all the time - that once you start sacrificing material, you cannot draw back from the task at hand. (Sometimes - it takes several more sacks to finish the job.)

Apr-19-12  JG27Pyth: Ok, Korchnoi's sac of the exchange + bishop for mating net is great and I sure didn't find it (finding those second sac's is often where I drop out) but isn't my Qf4 crushing as well, and without mortgaging the house? I go now to the silcon Oracle for answers...
Apr-19-12  JG27Pyth: Oh hecky-poo, for reasons too complicated and dull to explain I cannot get computer analysis for the position myself... can someone please tell me what fritz, or stockfish, crafty, houdini, etc. makes of 37.Qf4
Apr-19-12
Premium Chessgames Member
  fm avari viraf: After, having a cursory glance at the position, the first thing that got into my mind was 37.Rxf6 eliminating Black's menacing Bishop ...Rxf6 38.Qd4+ & Black's King lands in a spider's web. The rest, I leave to our aficionados for their deep analysis.
Apr-19-12
Premium Chessgames Member
  kevin86: They exchange sac puts the king into the open. White will mate quickly.
Apr-19-12  cyclon: Oh - high-level contestants, but I dare to "proclaim" ; 37. Rxf6 Kxf6 ( what is the other choice? - I'd love to know the plan ) 38. Qd4+ Kg5 <( -Qe5 39. Be7+ wins the Queen and 38. -Kf5 39. Bd6 is similar than text, because in my view 39. e4+ is inconclusive )> 39. Bd6 <( other moves are "tempting" but quite doesn't seem to make the day )> and NOW if Queen moves White mates by 40. Qf4+ Kh5 41. g4+ Kh4 42. Qh6X, or else for example; 39. -Rc2+ 40. Kf3 Qc6+ 41. Kg3 Rc4 ( just for 'illustration' ) 42. h4+ Kh5 ( -Kf5 43. Qe5X ) 43. Bd1+ Kh6 44. Bf8X. This puzzle was more like a "medium/difficult" - at least in my opinion.
Apr-19-12  cyclon: Fantastic play by White! I completely overlooked the marvellous 39. Be7+!! - 39. -Kh6 <( -f6 40. Qxf6+/ -Kh5 40. Qg4+ both mates and 39. Kf5 40. g4X )> 40. Qh4+ Kg7 41. Qf6+ Kh6 <( or -Kg8 42. Qxf7+ Kh8 43. Qg8X/Qf8X/Bf6X/Qf6X )> 42. Bf8 Kh5 43. g4X. BUT, it seems to me that ( my ) 39. Bd6 wins as well.
Apr-19-12  cyclon: <VincentL:38.....Kg5 39. f4+ Kh5 40. g4+ Kh6 > ( 40. g4+ ) 40. -Kh5.
Apr-19-12  cyclon: I was wrong with 38. -Kf5 39. e4+! as shown by <Memethecat:>.
Apr-19-12  jhelix70: <gofer
Hmmm. I got this totally wrong.

I would still like to check whether taking the knight is winning....>

I did the same thing, choosing Nxb6. As it turns out, this move is only slightly less crushing than Nxf6. Black can defend against mate, but ends up at least a piece down and hopelessly lost.

So, I wouldn't consider us "wrong" in this case! In fact, I consider the lines starting with Nxb6 easier to analyze than the ones that follow Nxf6.

Apr-19-12
Premium Chessgames Member
  chrisowen: Sartorial one ever elegance displayed by Viktor in try it hope for queen mate the mind boggles over flummox rxf6 or rxb6 both a look good for white one muscling him jab in 37.rxf6 kxf6 or get rookxb6 qxb6 at tell qe8 ridge cresting should invigorate his surge staple diet. I pluck edge fishing queend4 and mate in 5. So bb4 end age double frontal assualt too much for AY searching counterplay in time rd6 rc1 endearment it be the

<effective 37.rxf6 stock to play kxf6 qd4 with check and black king rub>

off g5 then step up 39.be7+ as far as i got hairy it seeming for hud across in die cast le rook in sky mountain to climb in col it turbulent in dxf rumple it her d4 good enough.

Apr-19-12
Premium Chessgames Member
  benveniste: I missed 39. ♗e7+, going with f4+ instead. Full credit or not, judges?
Apr-19-12  bachbeet: I got the first 2 moves but didn't see an advantage in the bishop check at e7. Korchnoi sure did.
Apr-19-12  BlackSheep: Well is it Rxb6 , Qxb6 , Qe8 , Rc2 , Bxc2 , Qd8 , Qxd8 , Bxd8 , Bd3 . Or is it Rxf6 and then I think the rook is immune because of Qd4 which leads to mate in a few different variations but I'm not sure if I missed something , which means Nc4 would be needed giving the bishop up for nothing either way white is a bishop up . Aaaah I've just looked at the game and black did indeed capture the rook with his king and got mated (back in a min I have to put this to an engine), right then both are definitely winning by a big margin but on reflection I think the Rxb6 line is easier to calculate and also gets all the heavy pieces off making it easier to finish black without complications because if black realised the rook was immune and played Kg8 just letting the bishop go there would be more pieces on the board giving rise to a chance to go wrong . Viktor calculated perfectly that the rook was immune because after Qd4 its mate in every variation . I havent spent so long on a puzzle in a while I really enjoyed this one because I just wasnt sure which is better Rxb6 or Rxf6 and finding out wasnt so easy .
Apr-19-12  SuperPatzer77: After 40. ♕f4+, Black resigns in lieu of 40...♔h5, 41. g4+ ♔h4, 42. ♕h6# - Final position - see diagram below:


click for larger view

White's key move to deflect the Black Queen is 39. ♗e7+!.

SuperPatzer77

Apr-20-12  newzild: Friday: 12.11pm - 12.52pm

Took me ages today because I got distracted by my girlfriend and also by sacs on b6 and f6 and a check on e4. However, I now think I've spotted the winning move:

37. Qf4 Ba1 38. Rxb6 Qxb6 39. Qxf7+ Kh6 40. Qf4+ g5(40...Kg7 41. Qf8#; 40...Kh5 41. Qg4+ Kh6 42. Bf8#) 41. Bf8+ Kg6 (41...Kh5 42. Bxf7+ ) 42. Qxf7#

The only alternative I can see is for black to play 37...Bd8, but then 37. Rxd8 Qxd8 38. Qxf7+ wins quickly.

Time to check.

Apr-20-12  newzild: I missed 37...Nd7.

Grr!

Apr-20-12  TheaN: Thursday 20 April 2012

<37.?>

Material: White ♗ vs ♘

Candidates: <[Rxf6]>

The only reasonable puzzle move here for White is to pry open the kingside of Black with a sham exchange sacrifice.

<37.Rxf6> due to the threat of Rxf7, it is the question whether Black has an alternative to Kxf6. The only reasonable move that comes to mind is Nc4, but because this is not threatening White can play it slowly with Qd4, simply threatening to move the rook with discovered check. So:

<37....Kf6 38.Qd4†> Qe5 fails on account of 39.Be7† and Black loses the Queen.

<38....Kf5> 38....Kg5 gets punished with 39.Be7†! (39....Qxe7 40.Qf4† Kh5 41.g4† Kh4 42.g5† Kxh3 43.Qg3‡ 1-0).

<39.g4† Kg5 40.Be7†> and the same mating net unfolds.

Apr-20-12  sevenseaman: Crafty link to this puzzle as required by <gofer>. No problem, welcome.

http://www.chessvideos.tv/endgame-t...

Apr-20-12  bwarnock: <sevenseaman: .... 37. Nc4 (...blocks the B and attacks the R but also engenders Rd7). My collected thoughts; [37. Qe8 Nc4 38. Rd7 Nd6 39. Rxd7 Nxe8 (automatic) 40. Rxc1] and wins>.

It's dicier if Black plays 37... ♕e7 (!) -- White's winning after 38. ♕xf7+ ♕xf7 39. ♗xf7 ♔xf7?! 40. ♖xb6 when after 40... ♖b1 41. ♖b7+! ♔g8 42. ♖xb5 ♗e7 42. ♖b8+ ♔f7 43. ♗d6! wins.

But after 39... ♗e7! 40. ♖xb6 ♗xb4 41. ♖xb5 ♖c2+ !


click for larger view

Black appears to have (a few) drawing chances (although White's obviously better and MAY still be winning).

Much tougher to win than the game.
<>

Apr-20-12  sevenseaman: <bwarnock> Very incisive and detailed thoughts. I have had time to analyse against Crafty too.

I now see that my line is much tougher to execute. In comparison the text is clean and precisely surgical. I appreciate your kind cooperation.

I visited your forum and was unable to post there. You may have a classified policy about that.

Nonetheless you will always be welcome to my forum, 'A Close Call'. Thanks.

Apr-21-12  bwarnock: A better alternative for White is 37... ♕e7! 38. ♗xf7(!) when 38... ♖c8 39. ♕xe7 ♗xe7 40. ♖xb6 transposes to lines similar to the previous analysis, but White now has the alternative 40. ♕xb5 ! which should lead to a win.

Or 38.... ♕xe8 39. ♗xe8 ♗e7 when there are two good alternatives to 40. ♖xb6 -- 40. ♖d4 or 40. ♗d2.

<>

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