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Chanda Sandipan vs Fred Slingerland
2nd LCT (2008), Leiden NED, rd 4
Sicilian Defense: Nezhmetdinov-Rossolimo Attack. Fianchetto Variation (B31)  ·  1/2-1/2
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Feb-10-11  sevenseaman: <<PhonyBenoni> The White pawn must get on to the b-file and B has to be sacked to force Black K out of a8 haven.


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w

1. Kc5 b6+(forced, if Black K goes to or c8 White K takes command at b6.) 2. axb6+ K retreats to b7(best), d7 or c8. 3. Kb5 Ka8 4. Bb8 Kb7 5. Kc5 Ka8 6. Kc6 Kxb8 (forced)7. b7 Ka7 8. Kc7 and White wins

Feb-10-11  LoveThatJoker: <sevenseaman> After 2. ab+ Kb7 3. Kb5 Ka8 4. Bb8 Kxb8 secures the draw for Black.

This is according to Houdini.

I can't take credit for this.

LTJ

PS. Just so you know the winning idea is 1. Kd4 Kc6 2. Bb6

Feb-10-11  VincentL: I have looked at this for some ten minutes, and I cannot see the solution.

The move may be 61. Kc6, but I fail to see how to win with this.

I am not doing well this week; letīs check to see what happened.

Feb-10-11
Premium Chessgames Member
  kevin86: I was looking at d7+ but that went nowhere. The solution is to sac the other pawn.

61 a6 bxa6+ (otherwise white wins by 62 d7+ ♔xd7 63 axb7 and queens) 63 ♔c6 and queens the pawn.

or if 61...b6 62 a7 and queens

Feb-10-11  sevenseaman: <<LoveThatJoker> PS. Just so you know the winning idea is 1. Kd4 Kc6 2. Bb6 >

Thanks. A learning process for me, I'd appreciate a set of winning sequence.

Feb-10-11
Premium Chessgames Member
  doubledrooks: 61. a6! and after 61...bxa6 62. Kc6 the threat of the d pawn queening is too much for black to handle.
Feb-10-11
Premium Chessgames Member
  Jimfromprovidence: <Phony Benoni> <The full game is not available in the database, but here's the endgame I was thinking of:> <Metger v. L. Paulsen, Nuremberg, 1888 WHTIE TO PLAY>

The only winning move is 1 Kd4. (Thank You Mr. Nalimov).


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The position is quite tricky, but the gist of the position is that every other move by white allows black to force white to take his b pawn and allow black's king to reach the a8 square and white can't promote because he has the wrong colored bishop.

One solution is 1 Kd4 b5 2 a6!


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This line allows white's king to take the pawn and keep the black king away from a8.

Feb-10-11  mecking93: a6! it's the best move and a chess player with 2588 ELO would have to know it.
Feb-10-11  David2009: <Phony Benoni>: Thanks for posting Metger v. L. Paulsen, Nuremberg, 1888


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(Metger vs Paulsen 1888 White to play)<Jim: The only winning move is 1 Kd4. (Thank You Mr. Nalimov)> And thank YOU, Jim. Even knowing the first move, I struggled to win against Crafty EGT without looking it up on Nalimov. I SHOULD have been able to work it all out by logic - but I couldn't.Here's the link: http://www.chessvideos.tv/endgame-t... Enjoy! and enjoy finding out why the alternative first moves only draw.

Feb-10-11  alachabre: Situational assessment:
Black threatens to fork B and P, not a terrible thing; the B can move and I doubt black will find it worthwhile to give up N for P. However, harassment by the N will allow the h pawn to slowly advance. White's king can't make progress so long as black's king is camped out on c8.

Ok, the only thing that seems to make progress:
61. a6 bxa6
62. Kc6 Nf5
63. d7+ Kd8
64. Bc7+ and queens.

What's the best defense? Clearly 62. ...Nf5 fails.

61. ... Kb8 (or ...Kd8)
62. d7 (a7)

No knight move seems to work on move 62, and any move beside Kb8 or bxa6 allows a7 and queening.

So that's it then, 61. a6

Feb-10-11  LoveThatJoker: <sevenseaman: <<LoveThatJoker> PS. Just so you know the winning idea is 1. Kd4 Kc6 2. Bb6 > Thanks. A learning process for me, I'd appreciate a set of winning sequence.>

Hey man. No problem. All lines are my own with the exception of

1. Kd4 Kc6 2. Bb6 (Houdini)

and

1. Kd4 b5 2. a6 (Jimfromprovidence)

Let's get started:

1. Kd4 Kc6 2. Bb6


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VARIATION A: 2...Kb5 3. Kd5 Ka6/Kb4 4. Kd6 Kb5 5. Kc7 Ka6 6. Kc8 winning

VARIATION B: 2...Kd7 (trying to run to a8 along the back rank) 3. Kc5 Kc8 (3...Ke8 4. Kd6 wins) 4. Ba7! Kc7 (4...b6+ 5. Kxb6 wins; 4...b5 a6 and we get the position Jimfromprovidence mentioned and wins) 5. Kb5 Kd7! (5...Kc8 6. Kb6 wins; 5...b6 6. a6 wins)

Position after 5...Kd7!


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6. Bb8!


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(6. Kb6? deserves a question mark as it is inefficient and could potentially be at best a draw as 6...Kc8! stymies any idea of a comfortable win for White; even if White can still win, 6. Kb6? is a bad move)

6...Kc8 7. Bh2! wins


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(cont.)

Feb-10-11
Premium Chessgames Member
  fm avari viraf: End games need precise calculations as well as good tactics & techniques too. Even GMs have faltered on many occasions & missed the winning path. Here, I think, Black has a winning chance with simply 61...a6 if 62.bxa6+ Kc6 or 62.K or N moves then ...a7
Feb-10-11  LoveThatJoker: VARIATION C: 2...Kd6 (not running, just trying to be a hardass and not let White's K into the 6th rank

2...Kd6


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3. Kc4 Kc6 [3...Kd7!? 4. Kc5!


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4...Kc8 (4...Ke8 Kd6 wins; 4...Ke7!? 5. Bc7 Kd7 6. Kb6 Kc8 7. Bh2! wins) 5. Ba7! Kc7 6. Kb5 wins]

4. Kb4 Kd7


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(4...Kd5 5. Kb5 Kd6 6. Bg1! Kc7 7. Bh2+! Kd7 8. Kb6 Kc8 9. Bg3 wins; 4...Kd6 5. Kb5 Kd7 6. Kc5! sets up the diagrammed position directly above this one and White wins)

5. Kc5! (again setting up the diagrammed position before this one and White wins!)

I hope this helps, man!

LTJ

Feb-10-11  montyshoewalker: 61. Kc5! - isn't that a blunder?

I don't think that there's anyway 61. a6 wouldn't be considered the best move; nothing to debate here, in my opinion..

Feb-10-11  wals: It was over the hills and far away for me as regards solving this puzzle.

Rybka 4 x 64 : d 22 : 15 min :

1. (#13): 61.a6 Nf5 62.a7 Kd7 63.a8Q[] Nxd6+ 64.Kb6 h4 65.Qa4+ Ke6 66.Qg4+ Kd5 67.Qd1+ Ke4 68.Qe2+ Kd4 69.Bxd6 Kd5 70.Bf4 Kd4 71.Kb5 Kc3 72.Be5+ Kb3 73.Qb2#

61.a6 Nf5 62.a7 bxa7..

Analysis by Rybka 4 x64: d 25 : 5 min :

1. (#10): 62.Kc6 Kd8 63.Bh4+ Ke8 64.d7+ Kf7 65.d8Q Ng4 66.Kd6 Kg7 67.Ke6 Kh7 68.Qe7+ Kg8 69.Bf6 Nxf6 70.Kxf6 Kh8 71.Qg7#

Feb-10-11  Patriot: I started looking at some possibilities and completely missed the win. After seeing the solution I thought..."a6? OHHH! bxa6 Kc6 wins!" It just looked so drawish to me.
Feb-10-11
Premium Chessgames Member
  johnlspouge: It seems that today <LTJ> hasn't left much for the rest of us to analyze :)

I was curious as to where the game soured for Black and I spotted


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Toga evaluates the position at 0.00.

45.g4 (evaluation drops to -0.7 P: a lemon)

Strategically, this seems bad, because it accelerates Black's K-side Ps.

45...Kd8 (evaluation bounces back to +0.4 P: another lemon)

Toga recommends Nd2, gaining tempo with the threats 46...Nf3+ and 46...fxg4.

Feb-10-11  LoveThatJoker: <johnlspouge> Thanks for the kind words, John.

LTJ

Feb-10-11  Lennonfan: I cannot believe this game ended up a draw,as even though i didnt see all the way to mate,as i just glanced for a min,i can see the pawn promotion and white should win this easily
Feb-10-11  sevenseaman: Thanks <LTJ>, you are a sport. Chess at times approaches drudgery, but for the challenge.

Its now understandable why it was an agreed draw OTB.

I indulge in the game without the use of chess engines(obtusely perhaps)and have had to rely on sporadic help from good Samaritans owning appropriate machines.

Lucky, I have never had it refused!

Feb-10-11  WhiteRook48: I tried 61 d7+
Feb-10-11  jovack: i'm very good with promoting pawns and saw this almost immediately

remove the defender, push the king up so white's king cannot occupy the 7th rank

the answer was a giveaway because black was promoting on a black square and had a black bishop vs a knight...

if black doesnt capture the pawn, white simply has 2 pawns who will advance and one will queen

Feb-11-11  LoveThatJoker: < sevenseaman: Thanks <LTJ>, you are a sport. Chess at times approaches drudgery, but for the challenge. Its now understandable why it was an agreed draw OTB.

I indulge in the game without the use of chess engines(obtusely perhaps)and have had to rely on sporadic help from good Samaritans owning appropriate machines.

Lucky, I have never had it refused!>

My pleasure, sevenseaman!

See you on the next puzzles, I'm sure.

LTJ

Feb-11-11  turbo231: 4 in a row this week. I usually don't even look a Friday's puzzle, but I have to go for 5 in a row. Today's puzzle was an uninspiring dud.
Feb-11-11  turbo231: No I was wrong just like Sandipan was, houdini won easily with white @ chessvideos.tv/endgame-training. So 3 out of 4 puzzles this week.
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