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Gerardo Barbero vs Bent Larsen
Buenos Aires Najdorf (1991), Buenos Aires ARG, rd 2, Apr-??
Semi-Slav Defense: Stoltz Variation (D45)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Oct-19-21  mel gibson: Easy one.

Stockfish 14 says mate in 8.

33. Ng6+

(33. Ng6+ (♘h4-g6+ h7xg6 ♖e3-h3+ ♔h8-g8 ♖g1xg6+ ♕f8-g7 ♖g6xg7+ ♔g8xg7 ♕f4-g4+ ♔g7-f7 ♖h3-h7+ ♔f7-f8 ♕g4-g7+ ♔f8-e8 ♖h7-h8+) +M8/71 51)

Oct-19-21
Premium Chessgames Member
  drollere: trial and error, i found 33. Ng6+ hxg6, 34. Rh3+ Kg7, 35. Qh6+ Kf7, 36. Qxg6+ Ke7, 37. Rh7+
Oct-19-21  Brenin: White needs to open up the h-file, so 33 Ng6+ hxg6 (else 34 Nxf8) 34 Rh3+ Kg8 35 Rxg6+ Kf7 36 Qxf6+ Ke8 37 Rh8, or 34 ... Kg7 35 Qh6+ Kf7 (Kg8 36 Qh7 mate) 36 Qxg6+ Ke7 37 Rh7+ Qf7 38 Qxf7 mate.
Oct-19-21
Premium Chessgames Member
  al wazir: 33. Rh6 does the job equally well:

A) 33...Nd5 34. Ng6+ Kg7 35. Nxf8+ Kxf8 36. Qh6+ Ke8 37. Rg8+ Ke7 38. Qxh7#.

B) 33...Qe8 34. Ng6+ Kg7 35. Qh6+ Kf7 36. Qxh7#.

C) 33...Qf7 34. Ng6+ Qxg6 35. Rxg6 Ne8 (35...Nd5 36. Nxd5 cxd5/exd6 37. Qxf6+) 36. Qh6 Rxd4 37. Qf8#.

Oct-19-21  Cheapo by the Dozen: The whole thing is pretty forcing. And calculations don't have to be totally precise, because "Win the queen and probably also quickly force mate" is good enough for decision-making purposes. :)
Oct-19-21  Cheapo by the Dozen: That said, it's just a Tuesday puzzle. I did work things out exactly. Whether Black selects ... Kg8 or Kg7 determines which way White will soon check on g6, and mate ensues either way.
Oct-19-21  Brenin: <al wazir>: Did you mean 33 Rh3 ? That seems work as well as 33 Ng6+.
Oct-19-21
Premium Chessgames Member
  agb2002: White has a knight for a bishop.

The position of the white pieces and Black's defenseless second rank invite to play 33.Ng6+ hxg6 (else 34.Nxf8+) 34.Rh3+:

A) 34... Kg7 35.Qh6+ Kf7 (35... Kg8 36.Qxg6+ Qg7 37.Qxg7#) 36.Qxg6+ Ke7 37.Rh7+ and mate in two.

B) 34... Kg8 35.Rxg6+ Kf7 (35... Qg7 36.Rxg7+ Kxg7 37.Qg4+ and mate soon) 36.Rxf6+ Ke7 (else 37.Rg3+ and mate soon) 37.Rh7+ and mate in two.

Oct-19-21  saturn2: I took 34.Rxg6
Oct-19-21  TheaN: <33.Nxg6+ hxg6 34.Rh3+ +-> was good enough a solution for me, seen the followups with either Qh6-g6 or Rxg6 and deemed it disaster in all cases; and it is because it's #8 from the starting position.

Sometimes these clearance puzzles have a weird and dragged out king walk line, but because White's holding the line at the d-file, this never happens.

Oct-19-21  Whitehat1963: Easier than yesterday?s puzzle.
Oct-19-21
Premium Chessgames Member
  chrisowen: Quoshes aid i v Ng6+ hubbub abracadabra v baulk a hood road v quoshes aid i v rut jewellery jaw its moody i pebble beef its gack its hank v hack honors it slouch v quivver its wrath mock v candy pine vis it question guv gnaw it z flabbergasted goof bubble abracadabra v mob grafter fought ook gungho flush griffon i v candy fled its boom i v hit sig red its achtung foo c ai ha in hope o if reveal guvs desk raven as v carry on terrible i v hong japs tail i v c fog ebb body it in i fertile rad elf i tin i bed c fab its good aorta it de riguer cradle red fog it is c rog counted it in i curdle Ng6+ duck;
Oct-19-21  AlicesKnight: Found the game moves; ...Kg7 or ...Kg8 lead equally to rapid denouement. What was Larsen doing?
Oct-19-21  landshark: What I see here is W wants to play Ng6+ but if he does so right away it gives B time to involve his a7 R into the defense by moving the N on c7 out of the way. But if he plays Rh3 first, the threat of Ng6+ winning the Q+P with attack for R+N can only be defended by a Q move, and that gains the decisive tempo. Let's see how we did.....
Oct-19-21
Premium Chessgames Member
  keypusher: <AlicesKnight: Found the game moves; ...Kg7 or ...Kg8 lead equally to rapid denouement. What was Larsen doing?>

Playing chess, looks like. He was always inconsistent, and by 1991 he was well past his peak.

Oct-19-21  awfulhangover: <Whitehat1963: Easier than yesterday?s puzzle.>

Impossible

Oct-19-21  King.Arthur.Brazil: A solid win from Barbero. Let me tell some words about him. I knew him in 1978, he became the 2nd place in South-American Junior Championship that took place in my city (Belo Horizonte - Minas Gerais - Brazil), first time, in that year. In the beginning, he was already pointed as a genius, in that time, and run to the top, but he lost a complicated and risky game against the Colombian. A Paraguayan which tied to him in a round before and was fighting head by head all the journey, wan the championship. Although, I suppose, both had gone to the World championship. which Barbero finished ranked fifth. He shared a little his analysis with the Colombian and the judges of the Organizing committee, after this game, in some minutes and we could see his capacity of chess: he was very smart and deep in details. Today, when I read his name in the game, I was in doubt because his father also played chess, however, looking to his name in Chessgames database, his games were up to 2000. However, the evidence of "born on 1961" told that it was he. Searching in Google, I found his photo, he is that guy: simple, smiley, calm and very polite. He wedded an Hungarian lady, had a son and had a friendship with Bobby Fisher, according to Eugenio Torre; however, early died of cancer in 2001. God takes the angels to his side fast. About the game. the Black last moves are: 33. ♘g6+ hxg6 34. ♖h3+ ♔g8 35. ♖xg6+ ♔f7 36. ♕xf6+ ♔e8 37. ♖h8... check mate ahead.
Oct-19-21
Premium Chessgames Member
  whiteshark: <saturn2: I took 34.Rxg6> That was my first thought too, but after <34... Ne8> Black can secure the seventh rank with the rook.
Oct-19-21
Premium Chessgames Member
  al wazir: <Brenin: Did you mean 33 Rh3 ?> Yes. Thanks.

I have long suffered from chess dyslexia (mixing up the K-side and the Q-side), as a result of having learned the English system of notation before the algebraic. Apparently my condition has worsened. Now I seem to be confusing the black side of the board with the white side.

When I can't tell the dark squares from the light, I'll have to quit playing chess.

Oct-19-21
Premium Chessgames Member
  eternaloptimist: I solved this quickly since I saw the ♘ fork threat. <al wazir> Lol ? there is definitely no shortage of ppl that don’t like descriptive notation. It didn’t give me much of a problem but it’s normal for ppl to move the pieces to the wrong squares sometimes when they go old school & break out the old DN ?. Also like u said it’s still affecting u now even tho algebraic notation replaced DN a long time ago. <whiteshark> I hope your eyes are doing much better now which I guess they are b/c u mentioned that u were having problems w/ your retinas & didn’t expect to make many comments in the future on CG
Oct-19-21  Cibator: <al wazir: When I can't tell the dark squares from the light, I'll have to quit playing chess.>

If that happens, you could always take up its direct ancestor, "Chaturanga" instead. That didn't use a chequered board until after it arrived in Europe around the 11th century.

Oct-20-21  Brenin: <al wazir>: Like you, I grew up using the English descriptive notation, and only later switched to algebraic. And like you, I find that my mind occasionally reverts to the old system for a second or two, with the third and sixth ranks particularly prone to confusion. Oh, well, there are worse things that could go wrong.

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