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Jorden van Foreest vs Stephen Kutzner
28th Staufer-Open (2016), Schwaebisch Gmuend GER, rd 2, Jan-02
King's Indian Defense: Normal. King's Knight Variation (E60)  ·  1-0



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Kibitzer's Corner
Premium Chessgames Member
  al wazir: Got it.

39...Rb4 would have won for black.

Oct-26-17  theo77: Ive played 62.Rb4 just because of mating combination on h4 square and later realized that defensive black rook blocks kings escape... if white starts with 62.Rb7+ black king can avoid the worst
Oct-26-17  patzer2: For today's Thursday (62. ?) puzzle, I was close but yet so far away with 62. Rb7+ as it allows Black to escape after 62. Rb7+ Kh6 63.Rb8 Kh5 64.Rh8+ Kg4 65.Kxg6 h3 66.Kf6 Rc3 67.Bd7 Rc5 68.Ba4 Kg3 69.Bd7 h2 70.Rxh2 Kxh2 = (0.00 @ 38 depth, Stockfish 8).

The winning move 62. Rb4! entices 62...Rg4 which eliminates Black's escape square on g4 in the above 62. Rb7+ line. As such, 62. Rb4! is an in-between move which prepares 63. Rb7+ +- in the game continuation.

As <al wazir> so succinctly observes, Black missed a win with 39...Rb4! Our Stockfish application gives the winning continuation -7.47 (31 ply) 39...Rb4 40.Be4 Rxe4 41.h3 Re2 42.Kh2 Kg5 43.Kg3 Rd2 44.h4+ Kh5 45.Kf3 Kxh4 46.Rh1+ Kg5 47.Rc1 f5 48.Ke3 Rxg2 49.Kf3 Rh2 50.Kg3 Re2 51.Kf3 Rd2 52.Kg3 Rd3+ 53.Kf2 Rc3 54.Ke2 Rc8 55.Rg1+ Kf4 56.Rc1 Kg3 57.Rg1+ Kh2 58.Rc1 Kg2 59.Ke3 Kg3 60.Rg1+ Kh2 61.Rc1 Kg2 62.Kf4 Rc4+ 63.Ke3 -+.

Premium Chessgames Member
  Caissalove: The'solution' of 62.Rb4 would only have drawn if black had found 62...f4!
Oct-26-17  Walter Glattke: 64.-h3 65.Bxf7 h2 66.Rb8# or
65.-Rxf7+ 66.Kf7 h2 67.Rb8# or
63.-Kh6 64.Bg8 h3 65.Rh7#
Oct-26-17  saturn2: Too hasty today. I took 62 Bg8+ Kh6 63 Rb7 threatening Rh7++ but the black king escapes 63..Kh5
Premium Chessgames Member
  agb2002: White has a bishop for three pawns.

The black king can eventually use g4 a an escape square. This suggests 62.Rb4:

A) 62... Rg4 63.Rb7+

A.1) 63... Kh6 64.Bg8 and 65.Rh7#.

A.2) 63... Kh8 64.Rb8+ Kh7 65.Bg8+ Kh8 (65... Kh6 66.Rb7 as in A.1) 66.Bf7+ Kh7 67.Rb7

A.2.a) 67... Kh8 68.Bxg6 and mate in two.

A.2.b) 67... Kh6 68.Bg8 as in A.1.

A.2.c) 67... h3 68.Bxg6+ and mate next.

B) 62... g5 63.Bxf5+ Kh6 64.Rb8 and mate next.

Premium Chessgames Member
  agb2002: <Caissalove: The'solution' of 62.Rb4 would only have drawn if black had found 62...f4!>

I saw 62... f4 but forgot to analyze it. My impression is that after 63.Rxf4 g5 64.Ra4 White has f5 for the bishop to close the mating net.

Oct-26-17  Cybe: 61… Rg3 loses. 61… Rc2!
Premium Chessgames Member
  Caissalove: Yes agb. It does seem that even 62...f4 would also have eventually lost also due to the idea you give.
Oct-26-17  mel gibson: I didn't see it.
The computer says mate in 21:

62. Rb4 (62. Rb4 (♖b8-b4 f5-f4 ♖b4xf4 g6-g5 ♖f4-c4 ♖g3-a3 ♖c4-c7+ ♔h7-h6 ♖c7-c8 ♖a3-f3+ ♗e6-f5 ♖f3xf5+ ♔f6xf5 ♔h6-g7 ♖c8-c7+ ♔g7-h6 ♖c7-b7 g5-g4 ♖b7-b4 h4-h3 ♖b4xg4 ♔h6-h5 ♖g4-g8 ♔h5-h4 ♔f5-f4 ♔h4-h5 ♔f4-g3 ♔h5-h6 ♔g3xh3 ♔h6-h7 ♖g8-g5) +M21/24 22)

Oct-26-17  Kyudaime: I got it also <62. Rb4> leads to a win for White.
Premium Chessgames Member
  Jimfromprovidence: <agb2002> <I saw 62... f4 but forgot to analyze it. My impression is that after 63.Rxf4 g5 64.Ra4 White has f5 for the bishop to close the mating net.>

Good side puzzle after after 62... f4 63.Rxf4 g5 64.Ra4 Rc3, below

click for larger view

White to play and win.

Note: There is more than meets the eye to this line. After 65 Bf5+ Kh6, for example, the position looks even.

Oct-26-17  kevin86: White can set up a mate along the h-file
Oct-26-17  gars: I did not see it, but it is very elegant, anyway.
Premium Chessgames Member
  al wazir: <patzer2: As <al wazir> so succinctly observes...>. All right, it was a little more complicated than I realized.
Oct-26-17  goodevans: <Jimfromprovidence: ... Good side puzzle after after 62... f4 63.Rxf4 g5 64.Ra4 Rc3>

I'm pretty sure the winning move is <65.Ra5>. Black can't let the g-pawn drop as white will quickly force mate on the h-file. But <65...Rg3> also fails to <66.Bf5+ Kh6 67.Ra8> and <68.Rh8#>.

Oct-26-17  patzer2: <Jimfromprovidence> Our Stockfish application gives two solutions to your side puzzle.

1) +128.46 (66 ply) 65.Ra5 Kh6 66.Rxg5 h3 67.Rg8 Kh7 68.Ra8 Rc6 69.Ra3 Kh6 70.Rxh3#

2) +128.45 (65 ply) 65.Ra7+ Kh6 66.Ra8 Rc7 67.Rg8 Rb7 68.Rg6+ Kh7 69.Rxg5 Kh8 70.Rg8+ Kh7 71.Rg4 Rb4 72.Rxb4

My pick was 65. Ra7+ Kh6 66. Ra8 +- after which I got the gist of the rest of the Stockfish line with the 67. Rg8 and 68. Rg6+ +- follow-up.

Premium Chessgames Member
  Jimfromprovidence: <goodevans> <patzer2>. Yes there are two correct moves to the side puzzle.

The trick is not to play either 65 Bf5+ or 65 Ra8. (try to figure out why not).

Also note that on move 64 white can play Ra4, Rb4, Rc4 or Rd4.

Premium Chessgames Member
  FSR: 62.Rb4 Rh3 (62...Rg4 63.Rb7+ Kh8 (63...Kh6 64.Bg8) 64.Rb8+ Kh7 65.Bg8+ Kh8 66.Bf7+ Kh7 67.Rg8+-) 64.Bf7 intending Bxg6 wins.

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