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Boris Spassky vs Ove Kinnmark
Gothenburg (1971), Gothenburg SWE, rd 8, Jul-??
Nimzo-Indian Defense: Leningrad Variation (E30)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Aug-09-20  mel gibson: I saw the first ply straight away -
but the follow up was tricky.
Aug-09-20  Walter Glattke: I just had the line 19.Nf7 Qxd3 20.Ng5+ Kg8 21.Me6 Kh7 22.Qh4+ Kg8 23.f5 Qxf1+ 24.Rxf1 Rxf5 25.Qd8+ Kh7 26.Rxf5 gxf5 27.Qe7+ Kh6 28.Qg7+ Kh5 29.Nf4+ Kh4 30.Qg3# black cannot mobilize his queen's wing pieces. 19.-Rxf7 20.Qxg6+ Kh8 21.Qxf7 Qxd3 22.Rf3 Qh7 23.Rh3 Rxh3 (Nf6? Qf8#) 24.gxh3 Nb6 25.Kf2 Bxh3 26.Rg1 mating 19.-Ne5 20.Bxg6+ Nxg6 21.f5 Bxf5 22.Rxf5 Qxe3+ white advantage, 23.Kh1 Kg7 24.Rg5 leads to decisive material.
Aug-09-20  mel gibson: Stockfish 11 took 24 minutes to solve this one. Answer - mate in 33.

19. Nxf7

(19.
Nxf7 (♘h6xf7 ♕a3xd3 f4-f5 ♕d3-a6 ♘f7-g5+ ♔h7-g7 ♘g5-e6+ ♕a6xe6 f5xe6 ♘d7-f6 ♕g4-h3 ♗c8xe6 ♕h3xe6 ♖f8-f7 ♖a1-c1 ♖a8-f8 ♖f1-f3 ♘f6-h7 ♕e6-e5+ ♔g7-g8 ♕e5xd5 ♔g8-g7 ♕d5-e5+ ♔g7-g8 ♖c1-c7 ♖f7xc7 ♖f3xf8+ ♔g8xf8 ♕e5xc7 ♘h7-f6 ♕c7xb7 a7-a5 ♕b7-b6 ♔f8-e7 ♕b6xa5 ♔e7-f7 ♕a5-c7+ ♔f7-e6 ♕c7-e5+ ♔e6-f7 d4-d5 ♘f6xd5 ♕e5xd5+ ♔f7-e7 ♕d5-e5+ ♔e7-f7 g2-g4 ♔f7-f8 ♕e5-f6+ ♔f8-e8 ♕f6xg6+ ♔e8-e7 ♕g6-f5 ♔e7-d6 g4-g5 ♔d6-c6 g5-g6 ♔c6-d6 g6-g7 ♔d6-c6 g7-g8♕ ♔c6-b6 ♕g8-b8+ ♔b6-c6 ♕f5-b5+) +M33/62 1410)

Aug-09-20
Premium Chessgames Member
  agb2002: I know this game.
Aug-09-20  jffun1958: nice finish
Aug-09-20  Brenin: I saw as far as 19 Nxf7 Qxd3 (what else? 19 ... Rxf7 20 Qxg6+ is hopeless) 20 f5, but was worried about Black playing 20 ... Qxe3+ 21 Kh1 Ne5, attacking the Q and defending g6. However, 22 Qh4+ seems adequate to deal with that, e.g. 22 ... Kg7 23 f6+, with mate to follow, or 22 ... Kg8 23 Qh8+ Kxf7 24 fxg6+ Kxg6 (or Ke6) 25 Rxf8, leaving Black helpless.
Aug-09-20  Walter Glattke: Brenin: 22.fxg6+ Kg7 23.Qh4+ Rxf7 (or mate next) 24.Qh7+ Kf8 25.Rxf7+ Nxf7 26.Qxf7# or 25.-Ke8 26.Qg8/h8# 22.-Nxg6 23.Qh5+ Qh6 24.Qxh6+ Kg8 25.Qh8# better than 22.Qh4+ I think.
Aug-09-20  cunctatorg: Bahhhhh....; only players of Spassky's -or Miles'- calibers can accomplish this combination including the 24. Nh7!! move...
Aug-09-20  Brenin: Thanks, <Walter Glattke>: After 19 Nxf7 Qxd3 20 f5 Qxe3+ 21 Kh1 Ne5 22 fxg6+ Kg7, 23 Qh4 isn't check, and it allows 23 ... Nxg6, though 24 Qf6+ and 25 Rae1 then has Black on the ropes. Similarly, 23 Qh5 allows 23 ... Nxg6. These lines give White a winning advantage, but I still think 22 Qh4+ is more direct.
Aug-09-20  saturn2: <Brenin 19 Nxf7 Qxd3 what else?> 19...Ne5 is a swindle worth looking at.The queen and Bd3 are under attack. White has 20 Qh4+ Kg7 or 20 Ng5+
Aug-09-20  Brenin: Thanks, <Saturn2>: After 19 Nxf7 Ne5 20 Ng5+ Kg7 White's Q must retreat (21 Qh4 Rh8) and Black survives, e.g. 21 Qg3 Nxd3, though 22 f5, threatening Qc7+, looks interesting. I think 20 Qh4+ followed by 21 fxe5 is the best response to the swindle attempt 19 ... Ne5.
Aug-09-20
Premium Chessgames Member
  Predrag3141: <saturn2: 19...Ne5 is a swindle worth looking at>

My concern with 19 ... Ne5 led me astray, and I guessed 19 f5 Kxh6.

Though Stockfish rated this 6 pawns weaker than actual play, the win is nice and clear because White has time to defend his bishop and press the attack with f6. This attack is worth more than a piece, since it continues even if Black returns the piece with ... Nxf6.

Aug-09-20  Walter Glattke: Nice, 23.f6+ Kxf7 24.Qh7+ allows Qe7#, really good analize! I always thought for fxg6 with line opening for the rook.
Aug-09-20  cormier: 10...c6? 10...Qe7 11.O-O f5 12.c5 g6 13.cxd6 cxd6 14.Rb1 Nd7 15.a4 = -0.21 (22 ply) 11. O-O ⩲ +0.72 (20 ply)
Aug-09-20  NBZ: I don't quite understand the discussion about 19. ... Ne5: can't White just play 20. Qh4+ Kg7 21. Nxe5 when the bishop is protected and White is completely winning? Or maybe I got the move number wrong.
Aug-10-20  Pedro Fernandez: I never saw the extraordinary move 19.Nxf7!! played by Boris. My modest move was 19.Qh4


click for larger view

which, I think, also wins with ease.

Remarkably, all Spassky moves were exactly equal as Stockfish 11, and not all those moves are trivial at all.

Aug-10-20  Brenin: <NBZ>: After 19 ... Ne5 20 Qh4+ Kg8 (or Kg7) 21 Nxe5 is certainly possible, and is enough to win, but in fact 21 fxe5 is even stronger, opening the f file for the rook(s): the hanging N on f7 and B on d3 are both poisoned, e.g. 21 ... Rxf7 22 Rxf7 Kxf7 23 Rf1+, while 21 ... Qxd3 leads to mate by 22 Qh6+ or Qh8+, as the K is on g7 or g8.

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