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Ratmir Kholmov vs Evgeny Sveshnikov
RUS-ch KO (1999), Moscow, rd 1, Dec-04
Semi-Slav Defense: Accelerated Move Order (D31)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Jul-23-06  LIFE Master AJ: Cool, first ... and I got it as well.
Jul-23-06  KingG: The first move is somehow 'obvious', but it's not easy to calculate everything after that.
Jul-23-06  NakoSonorense: Not so cool, second. didn't get it.
Jul-23-06  uscstudent: Yeap, I agree the first two moves are obvious, but the remaining combination requires a lot of computations.
Jul-23-06
Premium Chessgames Member
  chessgames.com: We had a lot of fun trying to verify this with computers. We're 90% sure that it wins in all variations but we've been proven wrong before.
Jul-23-06  Isolated Pawn: Well, if 46. bxc3, after the eventual exchange, I don't see anyway for the white king to protect the e pawn.
Jul-23-06  jahhaj: I saw the Nc3+, Nb1+ idea very quickly but then I didn't look hard enough at Nxa3, instead I wanted to leave the knight on b1 and play Kd3. That doesn't work unfortunately.

I don't think you need a computer to verify this. The position of the kings and pawns means it's clearly a win for Black. Once the minor pieces and b pawns have been exchanged he's never going to be able to defend the pawn on e3. In fact I'd say this is the easiest Sunday puzzle I've seen and I'm quite upset not to have got it.

Jul-23-06  OneArmedScissor: Sweet. I got it in about 30 seconds... same with yesterday's puzzle
Jul-23-06  jahhaj: Most Sunday puzzle are in complex positions where even if I can see the broad ideas the details are too much for me to calculate. This position I could have calculated to a win in all variations had I been a little more awake.

Or are there some subtleties I've missed?

Jul-23-06  LIFE Master AJ: <Nako> Not trying to tell anyone what to do ... (feel free to ignore this, if you like).

Starting on about Friday's puzzle, you can throw normal analysis out the windows, we are heading for "Sac City."

# 1.) Just look around, and find the most wild sacrifice you can see on the board. No matter how crazy it might appear at first, it should be the first thing you look at.

# 2.) Here the sac is very obvious, Black cannot take, as Black's Pawn will quickly cost White his Bishop. The resulting K+P endgame would be a very easy win for Black.

# 3.) In many endings, the key is usually a penetration square. One side guards this with all his might, for once the portal is breached, the game is lost. Here the d3-point is that magic square, White cannot lose control of it, and thus feels that he must walk into the fork when he goes to d2.

(Analysis next comment.)

Jul-23-06  dzechiel: Well, if you know your basic king-and-pawn endgames, then this puzzle was too easy for a Sunday.

If 46 bxc3 then ...Kxc3, you force the bishop to give itself up for the b-pawn and then you just move back and forth on the b-file (b2 & b3) until white has to give up coverage of c3, then you repeat on the c-file (c2 & c3) until white has to give up d3, then one last time on the d-file (d2 & d3) until white has to abandon e3. Take the e-pawn and win.

I had a game earlier this week on ICC that ended exactly the same way.

Jul-23-06  LIFE Master AJ: I pick up my analysis with move 45.

45.♔e2,
This was forced.


click for larger view

Now Black has a nice win.

<[ Much worse was: 45.Kf1? Kd3 46.Kf2 Nb6; ( ) (The Knight comes to c4 with a devastating effect.) ]>

45...♘c3+!!; 46.♔d2,
To protect the d3-square ... but White loses in all lines.

I have seen this before. Often times, a good player will spend all of his time looking at several different moves. He works out one or two very complicated lines, and then convinced that he is lost (no matter what), he plays an inferior move, one that he may not have worked out in every detail.

One could give this move a question mark ... if you really wanted to, but that would be like locking the barn door after the horse has been stolen. (Technically, White lost this game earlier, however - it is beyond my desire to fully annotate the game here.)

< [ The best line for White was: 46.Kf2 g6!; 47.bxc3,
This (now) looks forced, White is out of reasonable waiting moves.

< (47.Be7? Kd3!, and Black wins easily. (The coming fork on d3 is a killer, and is 48.PxN/c3?, then 48...b2 and Black promotes.) ) >

47...Kxc3; 48.Ke2 b2; 49.Bxb2+ Kxb2; 50.Kd2 Kb3; 51.h3 Kb2; 52.g4!? h5; 53.gxh5 gxh5; 54.h4 Kb3; 55.Kd1 Kc3; 56.Ke2 Kc2; ( ) Black has the opposition and the win is child's play from here.

***

The other line was:
46.bxc3 Kxc3; 47.g3,
White has few useful waiting moves, of course if something like 47.Bf8?? will allow Black to promote his pawn.

< (47.Kd1 b2; 48.Bxb2+ Kxb2; 49.Kd2 g6; 50.g3 Kb3; 51.h3 Kb2; 52.g4 h5; 53.gxh5 gxh5; 54.h4 Kb3, and Black wins as before.) >

47...b2; 48.Bxb2+ Kxb2; 49.Kd2 g6!;
and Black easily wins the K+P ending.

One line would be:
50.Kd1 Kc3; 51.Ke2 Kc2; 52.Ke1 Kd3; 53.Kf2 Kd2; 54.h3 h6; 55.h4 h5; 56.Kf1 Kxe3; 57.Ke1 Kd3!; 58.Kd1 e3; 59.Ke1 e2; 60.Kf2 Kd2; ( ) with mate in sight from here. ] >

46...♘b1+; 47.♔c1 ♘xa3; 48.bxa3 ♔d3!;
I really only had analyzed playing the King to c3, but that wins as well.

49.a4 ♔xe3; 50.a5 ♔d3; ( ) 0-1

Jul-23-06  LIFE Master AJ: .

< [The end of the game could be: 50...Kd3; 51.a6,
A race to Queen!

<(Fritz instead gives:
51.Kb2 e3; 52.Kxb3 e2; 53.Kb4 e1Q+; 54.Kb5 Ke4; ( ) when the win is simple if you know anything about K+P endgames.)>

51...e3; 52.a7 e2; 53.a8Q e1Q+; 54.Kb2 Qc3+; 55.Ka3, Maybe the best?

<(Or 55.Kb1 Qc2+; 56.Ka1 Qc1#)>

55...Qa1+; 56.Kxb3 Qxa8; ( )
when most human players would resign. ]>

0-1

Jul-23-06  RandomVisitor: Could Black also win with
45...h5 46.Kd2 h4 47.h3 g6 48.Be7 Nxb2 49.Bxh4
?
Jul-23-06  jahhaj: <RandomVisitor> I don't think White would ever move the bishop, because loosing the b2 pawn without any return is a clear loss. Instead he can just oscillate the king between d2 and e2. In which case you are forced to try the Nc3+ idea. A few extra pawn moves on the king side make no difference that I can see.
Jul-23-06  durnstein: <RandomVisitor> I think jahhaj is right.
Jul-23-06  khense: NC3+ Yet another move that I think most of us would have missed if we were not told there was a win to be had!
Jul-23-06  percyblakeney: This one was clean and straightforward for a Sunday, my immediate feeling was that Nc3+ must win thanks to a sooner or later following Kd3-Kxe3 and there aren't too many complications.
Jul-23-06  goldfarbdj: I agree, this is the easiest Sunday puzzle I've seen. I figured that bxc3 Kxc3 was an easy win, and so was Kd2 Nb1+; I spent most of my time analyzing Ke1 Kd3!. The point there is that 47. bxc3 transposes back to the original 46. bxc3 lines (the white king's being on e1 is if anything better for black) while on other moves black will win a pawn and with it the game -- e.g., 47. Kf2 Nd1+, 47. Bc5 Kc2 48. Ba3 Nd1.
Jul-23-06  makaveli52: I spent like 30 seconds looking at it, and decided Kc3 rather then Kd3 wins, the line i saw then doesnt work now that ive looked at it more carefully, but i think u can play Kd3 later and win the same way
Jul-23-06  Tariqov: <khense>I doubt that,i think some will find solution of this puzzle eventhough it was not told that there was a win,as Nc3 has forcing lines and seems to be the only way to breakthrough .
Jul-23-06  psmith: <RandomVisitor> Does Rybka find Nc3+ in this position, and if so, how quickly?
Jul-23-06
Premium Chessgames Member
  kevin86: White's king looks like the dog who try to catch two rabbits at once-in fact,it would become impossible to catch but one.

I got the first move,but this is not a true/false quiz,Sunday is an essay question.

Jul-23-06  EinZweiDrei: Like yesterday's puzzle, a surprisingly easy key, but with some depth to the continuation.
Jul-23-06  RandomVisitor: <psmith>Yes, Rybka finds 45.Nc3+, but the score is roughly -1.2 and it thinks that 46.bxc3 is White's best reply.

The next best move is 45...h5 at -1.0. Rybka has trouble seeing this all the way through to the end, but is helped a bit by endgame tablebases.

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