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Sandor Kun vs Gabor Merenyi
Gyor Matrai Nyar op (1997), ?
Spanish Game: Exchange. Gligoric Variation (C69)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Nov-18-14
Premium Chessgames Member
  whiteshark: <jedibishop: This game proves that Carlsen had big chance in N vs 2P ending yesterday and unfortunately spoiled it.>

heh, great minds think alike. ;)

Nov-18-14
Premium Chessgames Member
  Honza Cervenka: I don't understand 41...Bxf3?? After 41...Bxa4 42.Kxa4 Kf4 black wins despite of white's extra Pawn due to hopelessly "offside" position of white King. After that the game was dead draw but black found a neat way to lose it. Already 46...h3? should lose after 47.Kd4 Kg2 48.Ke3 Kxh2 (other moves are not better as black must take Ph2 and then he gets a mate by the Knight and the King in the corner or Ph2 survives and decides the game in the end.) 49.Kf2 Kh1 50.Ng5 Kh2 51.Nf7 Kh1 52.Ne5 Kh2 53.Ng4+ Kh1 54.Kf1 g5 55.Kf2 h2 56.Nf6 g4 57.Nh5 g3+ 58.Nxg3#. But white played inaccurately and missed this chance (very difficult to find over the board) and the game was still draw until unfortunate 53...Kh2?? instead of elegant and simple 53...g4! 54.Nxg4 h2=. Lucky win for white.
Nov-18-14  dfcx: can't believe this would happen in a real game instead of composition.

54. Ng4+ Kh1
55. Kf1! h7 forced
56. Nf2#

Nov-18-14  morfishine: <Honza Cervenka> Excellent point about 41...Bxa4 and the offsides White King
Nov-18-14  Chess Dad: <Pedro99: Why the extra half star? This is routine.>

If it's the first time you've seen it, it's not routine.

I looked at the puzzle, and immediately thought to myself "White doesn't have enough material to mate, therefore he's trying to prevent pawn promotion and a loss. Play for stalemate."

The first two moves are exactly what I'd play if I were playing for stalemate. My error was on the third move. I was thinking Kf2 1/2-1/2.

Nov-18-14  zb2cr: As others have said, the key here is the zugswang to force Black to play ... h2. This blocks the King and makes mate with the Knight possible.
Nov-18-14
Premium Chessgames Member
  Penguincw: I've seen this endgame before, but can't quite remember where...

J Nogueiras vs M Gongora Reyes, 2001

Unfortunately, I didn't get it. :(

Nov-18-14  jdc2: There is a nearly identical position in
Alburt's 300 Essential Positions book
(without the g pawn).
Nov-18-14  patzer2: White finds mate-in-three with 54. Ng4+! for today's Tuesday puzzle solution:

<54. Ng4+! Kh1> White blockades the advance of the g-pawn, while forcing the King to h1 and away from h2.

<55. Kf1 h2> With the g-pawn blocked and immobile, White makes an in-between waiting move to force Black to make the h2 pawn advance.

<56. Nf2#> With all of the Black King's flight squares eliminated, 56. Nf2# completes mate-in-three.

Nov-18-14  greed and death: I've seen this as a puzzle frequently before, but I had no idea this rather amusing mating net had ever occurred in an actual game...

54 Ng4+ Kh1 55. Kf1 h2 56. Nf2#

Nov-18-14  Castleinthesky: <Honza Cervenka> Nice point about move 41., I agree that if there would have been a simple piece exchange, Black would have had an easily won game. Nice little zugzwang puzzle.
Nov-18-14
Premium Chessgames Member
  AylerKupp: <<Gregor Samsa Mendel> I think that black could have drawn after 53..g4.>

You are quite correct, per the Nalimov tablebases, the best White can do after 53...g4 is a draw after 54.Nf1, 54.Nf5, 54.Nc4, and 54.Nxg4.

But that's not the entire story. Per the FinalGen tablebase generator, White <loses> after 54.Nd1, 54.Nd5, 54.Nc2, 54.Ke1, 54.Ke2, and 54.Kf1. Another example of why one must stay alert until the very end.

Nov-18-14
Premium Chessgames Member
  AylerKupp: <<jedibishop> This game proves that Carlsen had big chance in N vs 2P ending yesterday and unfortunately spoiled it.>

A very different position. There never was a N vs. 2P ending in Carlsen vs Anand, 2014,. There were rooks on the board so it was properly a R+N vs. R+2P ending, not a N vs. 2P ending. Magnus would have had good chances in a N vs. 2P ending but he couldn't force the exchange of rooks.

Nov-18-14  patzer2: The shortage of Black moves in this combination made me think of a particular Chess set I have made of chocolate colored ebony wood for the Black pieces.

Then this morning I read an article at http://www.msn.com/en-us/news/world... about the coming world shortage of chocolate coming by 2020. As a chocolate lover this deeply concerned me, but was of little concern to my wife who can take or leave the stuff. Of course this has always perplexed me, since all of our children and grandchildren love the stuff.

Apparently a fungal disease known as "frosty pod" has greatly reduced supply in West Africa (particularly in Ghana and The Ivory Coast) where 70% of the World's supply of cocoa is produced.

On the demand side is a great increase in the number of people world-wide willing to pay for more of the stuff. Perhaps that's because the world's rising numbers of middle class (now put at 5 Billion) can afford more moderately priced luxury goods like chocolate. Also the increasing popularity of dark chocolate, which contains up to 70% cocoa as compared to milk chocolate with 10% cocoa contributes to the shortage.

Not really looking for rock stars to come out and do a benefit to fight frosty pod, nor would I dream of asking for the world to go easy on chocolate consumption. Just thought it was interesting how interrelated and connected the world has become on something of common interest and enjoyment (i.e. chocolate).

Nov-18-14  Chess Dad: <AylerKupp: There were rooks on the board so it was properly a R+N vs. R+2P ending, not a N vs. 2P ending.>

On move 77, Carlson had the opportunity to enter a N vs. 2P ending.

He declined.

And that's probably a good thing, since there were more opportunities for him to play a losing move than there were for Anand.

Nov-18-14
Premium Chessgames Member
  kevin86: Mate in three: 54 ♘g4+ ♔h1 55 ♔f1! h2 56 ♔f2# Two advanced pawns vs a knight and the knight wins!
Nov-18-14  DPLeo: <AylerKupp: <<jedibishop> This game proves that Carlsen had big chance in N vs 2P ending yesterday and unfortunately spoiled it.>

A very different position. There never was a N vs. 2P ending in Carlsen vs Anand, 2014,. There were rooks on the board so it was properly a R+N vs. R+2P ending, not a N vs. 2P ending. Magnus would have had good chances in a N vs. 2P ending but he couldn't force the exchange of rooks.>

It depends on whether either one of them could have traded down to the ending they wanted.

If Carlsen could have traded down to this ending with White to move he would have won.


click for larger view

If Anand could have traded down to this ending with Black to move he would have won.


click for larger view

Enjoy!

Nov-18-14
Premium Chessgames Member
  Once: The solution itself is one of those masonic handshake sort of jobbies. Dead easy when you know it, but a mystery otherwise.

So let's rewind to see what got us to this pickle. Here's the position after 50. Ne4


click for larger view

This looks drawn ... and indeed it should be with best play. Black can't get his king off the h file to crown his pawn and white shouldn't have enough material to mate.

But faint heart never won fair maiden and no-one has won a game by accepting a draw offer. Probably.

So black plays the sneaky 50...g5

And now if white plays 51. Nxg5 h2!


click for larger view

Black willingly stalemates himself. If white moves his king out of the way to anywhere other than f3 we would get 51 K moves Kg1 52. Nf3+ followed by Nxh2 and we only have kings on the board. Even 51. Kf3 is a draw - 51... Kg1 52. Nh3+ and 53. Nf2

Rewind. White can't take the g5 pawn if he wants to win. He probably ought to offer a paw at this point and suggest that they repair to the pub. But white decides to roll the dice with a mini knight tour:

51. Ng3+ Kh2 52. Nf1+ Kh1 53. Ne3


click for larger view

We've got a similar position to a few moves ago, only this time the white knight and g pawn are one move further down the board. And again black draws by sacrificing his g pawn - 53...g4! 54. Nxg4 h2

But now something odd happens. Black knows how to draw this game by sacrificing the g pawn. He's played that trick already. But for some reason he doesn't play it now. Instead he opts for 53...Kh2? and walks into a rare single knight mate.

Maybe black was in time trouble. White gave him a chance to make a mistake and he took it.

Nov-18-14  gars: Ladies and gentlemen! Let's not forget that tomorrow, November 19th, is Capablanca's Birthday!
Nov-18-14  rollingrook5: I can't help but feel for black in this one. I actually like the way he played against the Spanish. The B vs. N endgame looked better before the ill timed sac.
Nov-18-14
Premium Chessgames Member
  WannaBe: Somebody have to convince Google to implement a <chrisowen> translator...
Nov-18-14  MostlyWatch: I think those analyses are flawed. This is about the chocolate now. I think they are like news reports concocted by reporters who never finished high school because of too hysterical a personality. It seems to me the doomsday predictions assume fixed supply. If the demand for chocolate goes up and the supply goes down, then the price goes up, right? So the demand reduces a little, and entreprenuers (sp?) see the golden opportunity and plant more cocoa trees. So the supply increases. And they develop a hybrid that can grow in Antartica, turning it into a (somewhat) useful piece of ground. Good grief, if it were like in the news stories, we'd be out of 90% of all commodities already. Every so often there's a little shortage of wheat, or tin, or water, or whatever.
Nov-19-14  patzer2: <MostlyWatch> Good economic analysis! You explain how long term supply in a free competitive market adjusts to reduce temporary price increases as well as I've seen it done.

Trust we didn't get too far off topic in turning a Tuesday chess puzzle into a discussion of agriculture commodity economics.

P.S.: Hope climate change doesn't discourage investment in hybrid cocoa bean tree plantations in Antarctica.

Nov-20-14
Premium Chessgames Member
  sycophante: 54.Ng4+ Kh1
55.Kf1 h2
56.Nf2#
Dec-13-16  kereru: Honza's analysis is correct, after 41...Bxa4 42.Kxa4 Kf4 Black picks up all 3 of white's pawns for an easy win.

The move that turned the draw into a loss was 46...h3??

Black probably still thought he was winning or at least had a chance of winning, and forgot there was even a possibility of losing against a solo knight.

Only other game in the chessgames database where a player pulled off a solo knight mate in actual play was J Nogueiras vs M Gongora Reyes, 2001

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