Jon Gudmundsson vs Oleg Neikirch (1939)

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Jon Gudmundsson vs Oleg Neikirch
Buenos Aires Olympiad Final-B (1939), Buenos Aires ARG, rd 6, Sep-09
Torre Attack: Classical Defense. Nimzowitsch Variation (A46) · 1-0

White to move.

ANALYSIS [x]

1-0

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

FEN COPIED

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Nov-19-20		SpiritedReposte: <34. Nxe6+!> A destructive sacrifice. After <37. f5> it's clear blacks king has no respite.

Nov-19-20		saturn2: I deviated by 37 Qxe6 White has sacrificed N for 3 pawns and his pawns in the center should crush. However 37 f5 opening the file for the rook seems stronger

Nov-19-20		mel gibson: That was not too difficult to see. Stockfish 12 agrees with the first few moves: 34. Nxe6+ (34. Nxe6+ (♘g5xe6+ f7xe6 ♖h8xg8+ ♔f8xg8 ♕g4xg6+ ♔g8-h8 ♕g6-h6+ ♔h8-g8 ♕h6xe6+ ♔g8-g7 f4-f5 ♕d8-g8 f5-f6+ ♘e4xf6 e5xf6+ ♗e7xf6 ♗d4xf6+ ♔g7-h7+ ♕e6xg8+ ♔h7xg8 ♖f1-f2 ♖b2-b8 ♔g1-g2 ♖b8-e8 ♗f6-d4 ♖e8-e1 ♔g2-g3 a5-a4 ♔g3-g4 a4-a3 ♔g4-h5 ♖e1-e6 ♔h5-g5 ♖e6-e1 ♔g5-g6 ♖e1-g1+ ♔g6-h5 ♖g1-e1 h2-h4 ♖e1-h1 ♔h5-g5 ♖h1-g1+ ♔g5-f5 ♖g1-g3 ♖f2-h2 ♖g3-d3 h4-h5 ♖d3-g3 ♔f5-f4 ♖g3-d3 ♔f4-g5 ♖d3-g3+ ♔g5-h4 ♖g3-d3 ♖h2-g2+ ♔g8-h7 ♔h4-g4 ♖d3-d1) +8.74/38 131) score for White +8.74 depth 38.

Nov-19-20		Walter Glattke: I saw at the first website, white can liberate the bishop with e6, after 34.Nxe6+ fxe6 35.Rxg8+ Kxg8 36.Qxe6+ Kf8 37.Qxg6 e.g. -Qe8 38.Qh6+ Kg8 39.e6 Nf6 40.Bxf6 Bxf6 41.Qxf6 wins 36.-Kh8 37.Qh3+ Kg8 38.e6 Bh4 39.f5 g5 40.f6 Nxf6 41.Bxf6 Qe8 42.e7 Rxa2 43.Bxg5 Bxg5 44.Rg7+ Kh8 45.Rf8+ wins or several other possibilities after 34.Nxe6+ fxe6 35.Rxg8+ Kxg8 36.Qxe6+ B) 36.Qxg6+ ask stockfish, 34.-Ke8? 35.Rxg8+ Kd7 36.Nxd8+ Kc7 37.Nxf7 thanksgiving for the butcher!

Nov-19-20		Messiah: Not the most difficult puzzle ever seen, still, I contemplated a while exactly how to penetrate Black's defenses with the Queen. Well done, CG staff, this one was a valuable calculations lesson, at least for a patzer like me.

Nov-19-20		drollere: i had 34. Nxe6+ fxe6, 35. Rxg8+ Kxg8, 36. Qxe6+ Kf8, 37. Qxg6, winning three pawns for the piece and flushing out the K.

Nov-19-20		saturn2: <drollere 36. Qxe6+ Kf8> 36...Kg7 covers g6. So it should be 36.Qxg6

Nov-19-20		Brenin: I saw 34 Nxe6+ fxe6 35 Rxg8+ Kxg8 36 Qxg6+ (better than 36 Qxe6+ Kg7) Kf8 (Kh8 37 Qh6+ Kh8 38 Qxe6+ is no better for Black, with f5 and Kh1, Rg1 to follow) 37 f5, and concluded that none of Black's many possible responses was adequate. After 37 ... exf5, 38 e6 (threatening Qf7 mate and bringing the B on d4 into play) might have been even stronger than Rxf5+.

Nov-19-20		Walter Glattke: I tested 36.Qxe6+ Kg7! good move, after 37.Qh3? Bc5! 38.e6+ Bxd4+ 39.cxd4 Nd6 black stands better, so 38.Bxc5 Nxc5 39.f5 Qg5+ 40.Kh1 not easy for both then. 36.Qxe6+ Kg7 37.f5 Rb6 38.f6+ (or BxR) Nxf6 39.exf6+ Kh6 several ways, Qh3 or fxe7.37.-gxf5 38.Qxf5 Bc5 39.Qf7+Kh6 40.Qe6+ perpetual moves!? 37.-Bf6? 38.exf6+ Nxf6 39.fxg5

Nov-19-20		WorstPlayerEver: Also had 34. Qxe6

Nov-19-20		chrisowen: Welcome to the bungle

Nov-19-20		agb2002: Black threatens Rxh8 and B(N)xg5. White can resume the attack with 34.Nxe6+ fxe6 35.Rxg8+ Kxg8 36.Qxg6+: A) 36... Kf8 37.f5 A.1) 37... Qe8 38.fxe6+ A.1.a) 38... Nf6 39.Qh6+ Kg8 40.exf6 Bxf6 41.Bxf6 wins. A.1.b) 38... Bf6 39.Bc5+ Nxc5 40.Qxf6+ Kg8 41.Kh1 wins. A.2) 37... Bf6 38.fxe6 Qe8 39.Bc5+ transposes to A.1.b. A.3) 37... Nf6 38.fxe6 Qe8 39.Qh6+ transposes to A.1.a. A.4) 37... exf5 38.e6 Ne7(g5) (38... Qe8 39.Qg7#) 39.Bg7+ Kg8 40.Bh6+ Kh8 41.Qg7#. B) 36... Kh8 37.Qh6+ Kg8 38.Qxe6+ B.1) 38... Kh8 39.Qh6+ Kg8 40.Qg6+ B.1.a) 40... Kh8 41.Kh1 Qg8 42.e6+ B(N)f6 43.Bxf6+ N(B)xf6 44.Qxf6+ Qg7 (44... Kh7 45.Qh4+ and 46.Rg1+ wins) 45.Qh4+ Qh7 (45... Kg8 46.Rg1 wins) 46.Qxh7+ Kxh7 47.Re1 Rb8 48.e7 Re8 49.Kg2 with a won ending. B.1.b) 40... Kf8 40.e6 Nd6 41.Qg7+ Ke8 42.Qf7#. B.2) 38... Kf8 39.Kh1 with the threat Rg1-Rg8# (39... Bh4 40.Rg1 Bg3 41.hxg3 wins decisive material. B.3) 38... Kg7 39.f5 (39.Kh1 Ng3+ 40.hxg3+? Qh8+ and mate in two) looks very good for White (39... Qg8 40.f6+ wins decisive material). B.4) 38... Kh7 39.Qf7+ B.4.a) 39... Kh6 40.f5 Rb6 41.e6 wins. B.4.b) 39... Kh8 40.e6+ Nf6 (40... Bf6 41.e7 wins) 41.Kh1 Qg8 42.Bxf6+ as in B.1.a.

Nov-19-20		Cellist: I saw the first two moves but then deviated with 36. Qxe6+, which is -- sadly -- not a clear win. I wanted to liberate the B by allowing e6 and possibly discovered check.

Nov-19-20		landshark: I'm in good company with the mistake 37.Qxe6?? = Admittedly Haven't had my coffee yet, and seldom budget much time for late week puzzles here because they tend to be too tough to crack and a lot of time can go into that without a satisfactory end for me - But the line-busting 37.f5 is just staring you in the face, and with even a <modicum> of effort it's easy to assess that 37.Qxe6, Bc5! frees the black's Q for its own mating threats and the win is gone and I should have seen it.

Nov-19-20		paavoh: I saw 34.Nxe6+ fxe6 35.Rxg8+ Kxg8 36.Qxg6+ Kf8 quickly, but then needed a chess board to find 37.f5. Partial credit. In hindsight, Black should have taken the Knight with 32.- Bxg5.

Nov-19-20		TheaN: Now <this> is a good Thursday puzzle (perhaps slightly too hard for this day, but Thu-Fri at least) because there are plenty of variations to consider. Both in the correct line and besides it. I spotted <34.Nxe6+> almost immediately, and then discarded it as I had the feeling the king side destruction would not merit a piece per se, and got stuck after <34....fxe6 35.Rxg8+ Kxg8 36.Qxg6+ Kh8 (Kf8 37.f5 +-)> . Not getting this line to work, I started looking for alternatives. 34.Qh3? <almost> works, because White is threatening Rxg8+ with Qh7+, and after 34....Nxg5 35.Qh6+ +-. However, 34....Bxg5 wins, as White has no time for 35.fxg5 Qxg5+ 36.Kh1 Rxh8! 37.Qxh8+ Ke7 -+ and the Black king escapes, barely. Then I wasted time on the destruction alternative 34.Nxf7?! which is a draw apparently, after 34....Kxf7 35.Rh7+. If White attempts 35.f5? he misses that Black defends Rg8 with Ke7, as 35....gxf5 or exf5 -+ both win. So, back to <36....Kh8>. At this point I started realizing that the threat of f5, which is the point after 36....Kf8, is very real even with the f-file closed, and settled on <37.Qh6+ Kg8 38.Qxe6+ Kg7> all the alternatives follow a similar idea based on f5 (or e6 if allowed): 38....Kf8 39.f5 +-, 38....Kh8 39.Qh6+ Kg8 40.f5 +-. 38....Kh7 Qf7+ Kh8 (Kh6 40.f5 +-) 40.e6+ Bf6 41.e7 +-. <39.f5 +->: click for larger view Black has the outposted Knight for two pawns, but these killer passers determine the outcome. SF gives Black's best line as returning two pieces(!) immediately with 39....Qg8 40.f6+ Nxf6 41.exf6+ Bxf6 42.Bxf6 Kh7+ 43.Qxg8+ Kxg8 44.a4 +- and White has a rather straightforward endgame B+P up.

Nov-19-20		Walter Glattke: TheaN diagram: 39.-Qg8 40.Qxe7+?? Kh6+ 41.Kh1 Qg2# refined. 40.f6+ Kh7+ 41.Qxg8+ Kxg8 42.fxe7 Rb8 white advantage, 40.Qg6+ Kf8 41.Qxg8+ Kxg8 42.f6 Nxf6 43.Bxf6 Rb7 white advantage.

Nov-19-20		Honza Cervenka: 34.Qxe6 doesn't work for 34...fxe6 35.Nxe6+ Kf7 36.Nxd8+ Rxd8 and white is simply a piece down.

Nov-19-20		tivrfoa: hi! does 35.Qxg6 work?

Nov-19-20		Vegiraghav: 30 Rb2 looks completely unnecessary and takes the piece out of any sensible play give whites strong king side attack.

Nov-19-20		saturn2: <tivrfoa: hi! does 35.Qxg6 work?> 34. Nxe6+ fxe6 35. Qxg6 Rxh8 White has given two pieces for two pawns

Nov-19-20		scruggs: Who is me and I had 13 going in a row but we blew this one . Oh well what the hell

Nov-19-20		Who is me: i is SAD ! 13 by by

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