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Roderick M McKay vs Vlastimil Hort
Chess Olympiad (1982), Lucerne SUI, rd 2, Oct-31
Pirc Defense: Classical. Schlechter Variation (B08)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Sep-17-04  Jesuitic Calvinist: Well played by McKay against a very strong opponent. Even after 17.Bxg6, there was some work to do to secure the full point, but white held his nerve.
Sep-07-18
Premium Chessgames Member
  wtpy: I found 17 Bg6 but after 17 ..fg6 18 Qe6 Kh8 went 19 Nf7, which seems strong as well.
Sep-07-18  nalinw: I was working on Nxh7 followed by Rf6 but the engine shows that Black can break through in the centre and defend.
Sep-07-18  Walter Glattke: 17.Bxg6 hxg6 18.Qh5 f5 19.Qh7# / 17,Nxh7 Kxh7 18.Qh5+ Kh8 19.Rf6 Qe7 20.Bh6 cxd4 21.Bxg7 Kxg7 22.Bxg6 Qxf6 or mating 23.exf6+ Kxg6 24.Rf1 Rh8 25.Qg4+ Kh6 26.Qg7+ Kh5 27.Rf4 - 17.Bxg6 is very tricky, but wrong.
Sep-07-18  SpamIAm: <Walter Glattke>, after your line 17.Bxg6 hxg6 18.Qh5, I'm pretty sure that black can play 18...gxh5 safely. Perhaps you meant 18.Qh4 instead, which wins easily.
Sep-07-18  Walter Glattke: Of course, 18.Qh4.
Sep-07-18  Walter Glattke: Typing mistake, 18.Qh4+ also after 17.Nxh7 Kxh7 Ö 17.-Rfd8 18.Qh4 Qe7 19.Nf6+ Kf8 20.Bh6 / 19.-Bxf6 20.exf6 Qf8 21.Bh6 Qe8 22.Bg7 Ö 20.-Qe6 21-Bxg6 fxg6
22.f7+ Kf8 23.Bh6#
Sep-07-18  Whitehat1963: Maybe a Sunday puzzle? Just maybe.
Sep-07-18  Mayankk: The key to this puzzle was that after 17 Bxg6, hxg6 is not possible because of the Qh4 mate threat on h file.

Once we realise this, Bxh6 seems interesting since if nothing else, White can have a fork with 17... fxg6 18 Nxe6 and have a Rook and two pawns for a Bishop and Knight (I donít think that wins but at least is materially promising).

18 Qxe6+ and all the subsequent tactics are too difficult for patzers like me to visualise before 17th move itself. Maybe once you play 17 Bxg6 fxg6, all the tactics hit you suddenly and you decide on Qxe6+ instead of Nxe6! Ah well.

Sep-07-18
Premium Chessgames Member
  malt: Got the first few moves
17.B:g6 fg6
(17...hg6 18.Qh4 Rfe8 19.Qh7+ Kf8 20.N:f7 )

18.Q:e6+ Kh8 19.Nf7+ or 19.Rf7

Sep-07-18  lost in space: <<malt>: Got the first few moves 17.B:g6 fg6
(17...hg6 18.Qh4 Rfe8 19.Qh7+ Kf8 20.N:f7 )

18.Q:e6+ Kh8 19.Nf7+ or 19.Rf7>

Same here

Sep-07-18  WorstPlayerEver: 19... Rxf7 20. Nxf7+ Kg8


click for larger view

I missed 21. Nd8+ Kh8 22. Qe8+ Bf8 23. Qxf8x here.

----

SF gives 24. Qd7 Rb8 25. Nxg7 Qxg7 26. Qxd5 kind of an hilarious position:


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Sep-07-18  Everett: Isnít 19.Nf7+ better? For instance, <19.Nf7+ Kg8 20.Nd8+> cuts back rank communication and ends the game.
Sep-07-18  WorstPlayerEver: 19. Nf7+ Rxf7 20. Rxf7 Qc8 21. Qd6 bxc3 22. bxc3 Rb8 23. Raf1 Qg8 24. Rc7 Rd8 25. Qxc5 Ba8 26. Rff7 seems not too bad either.


click for larger view

Sep-07-18  WorstPlayerEver: 19. Nf7+ Rxf7 20. Rxf7 Qc8 21. Qd6 bxc3 22. bxc3 Rb8 23. Raf1 Qg8 24. Rc7 cxd4 25. cxd4 Rd8 26. Qc5 Ba8 27. Rff7 h6 28. Rxg7 Qxg7 29. Rxg7 Kxg7 30. Qb6 g5 31. Qxa6


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I'd say 19. Nf7+ is somewhat more forceful. But also harder to calculate.

Sep-07-18  cormier:


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Analysis by Houdini 4: d 21 dpa

1. = (0.00): 16...Qe7 17.Qh4 h6 18.Nf3 Qxh4 19.gxh4 c4 20.Bc2 Rab8 21.Nh2 h5 22.Bg5 Ba8 23.Rab1 Rb7 24.Nf3 Rfb8 25.Kh2 bxc3 26.bxc3 Rb2 27.Rxb2 Rxb2 28.Bd1 Ra2 29.Kg3 Kh7

2. = (0.00): 16...Bc8 17.h4 bxc3 18.bxc3 Qa5 19.Rac1 c4 20.Nxh7 Kxh7 21.Qh5+ Kg8 22.Bxg6 fxg6 23.Rxf8+ Kxf8 24.Rf1+ Kg8 25.Qxg6 Qxc3 26.Qf7+ Kh8 27.Qh5+ Kg8 28.Qf7+ Kh8

Sep-07-18  cormier:


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Analysis by Houdini 4: d 18 dpa done

<1. + - (2.11): 16.Nxh7> cxd4 17.cxd4 Kxh7 18.Rxf7 Rxf7 19.Qh5+ Kg8 20.Bxg6 Qc7 21.Qh7+ Kf8 22.Bxf7 Qxf7 23.Rf1 Qxf1+ 24.Kxf1 Bc8 25.Bh6 Bxh6 26.Qxh6+ Ke8 27.Qh5+ Kf8 28.Qh4 Ke8 29.Kf2 Ra7 30.Qh8+ Kd7 31.Qh7+ Ne7 32.g4 Rc7 33.Qd3 Rc4 34.h4 b3 35.Kf3 Rxa4 36.h5

Sep-07-18
Premium Chessgames Member
  agb2002: White can weaken the black castle with Nxh7, Bxg6 or Qh4.

In the case of 17.Bxg6:

A) 17... fxg6 18.Qxe6+

A.1) 18... Kh8 19.Nf7+

A.1.a) 19... Kg8 20.Nd8+ Kh8 21.Rxf8+ Bf8 22.Nf7+ Kg7 (22... Kg8 23.Nh6+ and 24.Qg8#) 23.Bh6+ (23.Qf6+ Kg8 24.Qh8+ Kxf7 25.Qxh7+ Bg7 26.Rf1+ Ke8 looks unnecessarily complex) 23... Kg8 24.Nd8+ Kh8 25.Qf6+ Bg7 (25... Kg8 26.Qxf8#; 25... Qg7 26.Bxg7+ Bxg7 27.Qf7 Nxd8? 28.Qe8+ Bf8 29.Qxf8#) 26.Nf7+ Qxf7 (26... Kg8 27.Qxg7#) 27.Qxf7 Bxh6 28.Qxb7 wins decisive material.

A.1.b) 19... Rxf7 20.Rxf7 Qc8 21.Rf8+ Kxf8 22.Nxh7#.

A.2) 18... Rf7 19.Rxf7 wins (19... Nd8 20.Rf8+ Kxf8 21.Nxh7#).

B) 17... hxg6 18.Qh4 Rfc8 19.Qh7+ Kf8 20.Rxf7+ Qxf7 21.Nxf7 Kxf7 22.Rf1+ wins decisive material.

Sep-07-18
Premium Chessgames Member
  agb2002: I mixed some lines in A.1.b, since the white knight was captured at move 19.

The simple 21.Qd6 followed by Raf1 should be winning.

Sep-07-18  Walter Glattke: 17.Nxh7 is not the only corect move, 17.Bxg6 is weaker, but 17.Nxf7! I testet it with 17.Nxf7 Rxf7 18.Rxf7 Qxf7 (not Qc8 as worst player) 19.Rf1 Qe8, but I see now, White wins then with 20.h4 Bc8 21.h5 Nd8 22.hxg6 hxg6 23.Bxg6 Qe7 24.Qh5 Bf8 25.Rxf8+!Qor Kxf8 Qh7# or Qh8# But the strongest seems to be 17.Nxh7.
Sep-07-18  cormier:


click for larger view

Analysis by Houdini 4: d 24 dpa done

<1. = (0.07): 15...cxd4> 16.cxd4 Qb6 17.Qe1 Na5 18.g4 h6 19.Nf3 Nc4 20.b3 Nxe3 21.Qxe3 a5 22.Rac1 Rac8 23.Bb5 Qe6 24.g5 hxg5 25.Rxc8 Bxc8 26.Qxg5 Bb7 27.Qf4 Qf5 28.Qxf5 gxf5 29.Bd7 f4 30.Kf2 Rd8 31.Bg4

2. + / = (0.33): 15...c4 16.Bc2 bxc3 17.bxc3 Qa5 18.Qe1 Bc8 19.g4 Nd8 20.Rb1 Ra7 21.Rb8 Qc7 22.Rb4 h6 23.Nf3 Nc6 24.Rb1 Rb7 25.Rxb7 Qxb7 26.Qc1 Kh7 27.Qa3 Bd7 28.Rb1 Qa7 29.a5 Rb8

3. + / = (0.33): 15...bxc3 16.bxc3 c4 17.Bc2 Qa5 18.Qe1 Bc8 19.g4 Nd8 20.Rb1 Ra7 21.Rb8 Qc7 22.Rb4 h6 23.Nf3 Nc6 24.Rb1 Rb7 25.Rxb7 Qxb7 26.Qc1 Kh7 27.Qa3 Bd7 28.Rb1 Qa7 29.a5 Rb8

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