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Vasilios Kotronias vs Loek van Wely
Munich op (1992/93), Munich GER, rd 6
Sicilian Defense: Najdorf Variation. English Attack (B90)  ·  1-0



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Kibitzer's Corner
Jun-09-19  R4f43l L3 M4550n: humm, knowing it is an insane puzzle the Rook sacrifice suggests itself.

In my opinion this problem is more about to identify that the quality sacrifice is ok because of the poor black King position than calculate several lines.

Premium Chessgames Member
  al wazir: After 17. Rxd5 Nxd5 I wanted to play 18. Bxe4, but 18...N7f6 holds.
Jun-09-19  Steve.Patzer: I figured it would be RxB but could go no further.
Jun-09-19  mike1: not much to do with " insane" though...
there is no win for white after 18...N7f6 (not N5f6).
Premium Chessgames Member
  An Englishman: Good Evening: Saw as far as 19.Nc5 and reached two conclusions.

1. If Black took the Knight, he won't castle and his Rooks might as well not exist. 2. If Black didn't take the Knight, the pin turns brutal when White piles on with Bb3-a4.

Therefore, this had to prove the correct line. If 18...N7f6; 19.c4 might keep some advantage.

Kotronias is a great attacker and might have seen as far as 25.Ne6!, but even so, this still qualifies as a speculative sacrifice because he could not have seen every variation. You have to trust your instincts and your tactical ability.

Jun-09-19  mel gibson: I wasn't sure but I saw the Rook move.

Stockfish 10 is calling it a draw.

17. Rxd5

(17. Rxd5 (♖d1xd5 ♘f6xd5 ♖h1-d1 ♘d7-f6
♘b3-c5 ♗f8xc5 ♗c2-a4+ ♔e8-f8 ♗e3xc5+ ♔f8-g8 ♗a4-b3 ♕d8-c7 ♖d1xd5 a5-a4 ♗b3-c4 ♘f6xd5 ♗c4xd5 b4xc3 ♗d5xa8 c3xb2+ ♔c1xb2 ♕c7xc5 ♕h3-d7 ♕c5-b4+ ♔b2-c2 ♔g8-h7 ♗a8-d5 ♖h8-b8 ♕d7-f5+ g7-g6 ♕f5xe4 ♕b4-b1+ ♔c2-d2 ♖b8-b2+ ♔d2-e3 ♕b1xe4+ ♗d5xe4 ♖b2xa2 ♘e2-c3 ♖a2-a1 ♔e3-d3 a4-a3 ♔d3-c4 a3-a2 ♔c4-b3 ♖a1-f1 ♘c3xa2 ♖f1xf4 ♘a2-c3 ♔h7-g7 h2-h3 ♖f4-h4 ♗e4-f3 ♔g7-f6 ♘c3-b5 g6-g5 ♗f3-e2 g5-g4 h3xg4 h5xg4 ♔b3-c3 ♔f6-f5) +0.09/34 187)

score for White 0.09 depth 34.

Jun-09-19  patzer2: For today's Sunday puzzle, I correctly guessed the game continuation 17. Rxd5! Nxd5 18. Rd1 ⩲ to =.

White is forced to play 17. Rxd5! Nxd5 18. Rd1 ⩲ to = not because it's a forced win. Quite the contrary, as Black equalizes after 17. Rxd5! Nxd5 18. Rd1 N7f6 = (0.00 @ 38 ply, Stockfish 10).

The reason 17. Rxd5! Nxd5 18. Rd1 ⩲ to = is necessary is the alternative is ugly and unappealing. Stockfish 10 gives the next best alternative as 17. Bd4 a4 18. Bxf6 axb3 ⩱ (-0.57 @ 39 ply, Stockfish 10) with Black stealing the attacking initiative.

Jun-09-19  morfishine: Whats the point of this puzzle? Black blundered and lost
Jun-09-19  jayfreeman: 17. Rxd5 is the best move here, but it is not leading to a win. Black should just take the knight on 25th move (25... fxe6) and he is even winning. Actually 25. Ne6 was a losing mistake from white, otherwise he should be able to draw as <mel_gibson> said.
Jun-09-19  sadmadbadcad: <jayfreeman><Black should just take the knight on 25th move (25... fxe6) and he is even winning> After 25... fxe6 26 Qxe6+ Kd8, then 27 Rc1 seems to win for White.
Jun-09-19  Hercdon: Is anybody able to decode chrisowen? I for one am not ashamed to admit that I cannot .
Premium Chessgames Member
  chrisowen: <Hercdon> Naritzwa machairika eidi
Jun-09-19  mel gibson: < Hercdon: Is anybody able to decode chrisowen? I for one am not ashamed to admit that I cannot .>

I placed him on ignore ages ago so I don't
even see his posts.

Premium Chessgames Member
  chrisowen: <mel gibson> Nine yard by far.
Premium Chessgames Member
  agb2002: Black threatens a4.

The knight on f6 protects the bishop on the d5 and the pawn on e4. This suggests 39.Rxd5 Nxd5 (39... a4 40.Rxd7) 40.Bxe4:

A) 40... Nxe3 41.Bxa8 Qxa8 (41... Ng4 42.Qf3 seems to win a pawn at least).42.Qxe3+ seems to win a pawn at least.

B) 40... Ndf6 41.Qf3

B.1) 41... Nxe4 42.Qxe4+ Qe7 (42... Be7 43.Rd1 wins decisive material) 43.Qxd5 Qxe3+ 44.Kb1

B.1.a) 44... Rd8 45.Qb5+ Rd7 (45... Ke7 46.Nxa5, threatening Nc6+, looks good for White) 46.Rd1 Qe6 (46... Qe7 47.Nc5 wins decisive material -47... Qxc5 48.Qxd7#-) 47.f5 Qe7 48.Nc5 as in the subline.

B.1.b) 44... Ra7 45.Qb5+ Ke7 (45... Rd7 46.Rd1 as in B.1.a) 46.Ned4, with the threats Nc6+ and Nf5+, looks good for White.

B.1.c) 44... Rb8 45.Qc6+ Ke7 (45... Kd8 46.Rd1+ and mate soon) 46.Qc7+ recovers material.

B.1.d) 44... Rc8 45.Qb5+ Ke7 46.Qb7+ looks similar to B.1.c.

B.2) 41... Rb8 42.Rd1 Rb5 43.Ned4 looks good for White (43... Nxe3 44.Qxe3 with the double threat Bc6# and Nxb5).

Premium Chessgames Member
  Breunor: After 25 Ne6:

1) +4.03 (20 ply) 25...Rc8 26.Nxg7+ Kd8 27.Be5 Ke7 28.Nf5+ Kf8 29.Bd6+ Ke8 30.Ka1 Rh7 31.Ba4 Qc4 32.Qa3 Qc3+ 33.Qxc3 Rxc3 34.Be5 Rd3 35.Rxd3 exd3 36.Bxf6 d2 37.Bc3 Kf8 38.Bxa5 Rh8 39.Bxd2 Ke8 40.g3 Rg8 41.Nh6 Rg6 42.Nf5

2) +4.70 (20 ply) 25...fxe6 26.Qxe6+ Kd8 27.Rc1 Qxd6 28.Qxd6 Rc8 29.Rd1 Rc7 30.Be6 e3 31.f5 Re8 32.Qd3 e2 33.Qxe2 Kc8 34.Ka1 Kb8 35.Qa6 Rb7 36.Rb1 Rxb1+ 37.Kxb1 Rc8 38.Qb5+ Kc7 39.Qxa5+ Kd6 40.Qa3+ Rc5 41.Qg3+ Kc6 42.Qxg7 Kd6 43.Qf7

Jun-09-19  cormier:

click for larger view

Analysis by Houdini 4

24.Kxb2 Qa6 25.Ne6 Rc8 26.Nxg7+ Kd8 27.Qf5 Rc7 28.Bxc7+ Kxc7 29.Ka1 Kb8 30.Ba4 Rd8 31.Nxh5 Nxh5 32.Qxh5 Qf6+ 33.Kb1 Rh8 34.Qxa5 Qb6+ 35.Qb5 Qxb5+ 36.Bxb5 Nc5 37.h3 Kc7 38.Bc4 Rh4 39.Rf1 f5 40.Kc2 Rh6 41.Kd2 Rg6 42.Rg1 Ne6 43.Bxe6 Rxe6 44.Rc1+ Kd6 45.Ke3 Kd5 46.g4 + - (1.59) Depth: 22 dpa done

<24.Kxb2 Qa6 25.Ne6 Rc8 26.Ka1> Rc6 27.Nxg7+ Kd8 28.Be5 Ng4 29.Bxf7 Kc8 30.Bd4 e3 31.Qf3 Ndf6 32.Nf5 Rd8 33.Ne7+ Kc7 34.Nxc6 Qxc6 35.Qxc6+ Kxc6 36.Rc1+ Kb7 37.Bc3 Rf8 38.Bc4 Nxh2 39.Bxa5 Ra8 40.Be1 Nhg4 41.Kb2 Kc6 42.Bb3+ Kb6 43.Bd1 Nd5 44.Bf3 Ngf6 45.f5 Rb8 46.Kb3 + - (1.86) Depth: 23 dpa done

Jun-09-19  cormier:

click for larger view

Analysis by Houdini 4 <d 20 doa done

1. = (0.00): 23...Qa6> 24.Nf5 cxb2+ 25.Kxb2 Qe2+ 26.Kb1 Qg4 27.Ba3 Qxh3 28.gxh3 Kd8 29.Rc1 Nb6 30.Nd6 Kd7 31.Nxf7 Rhc8 32.Ne5+ Ke8 33.Bf7+ Kd8 34.Nc6+ Kd7 35.Ne5+ Kd8 36.Nc6+

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