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Vasilios Kotronias vs Xiu Deshun
"Vas Right Wing Conspiracy" (game of the day Jan-19-2012)
Aeroflot Open (2011), Moscow RUS, rd 6, Feb-13
Sicilian Defense: Najdorf Variation (B94)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jan-19-12
Premium Chessgames Member
  Phony Benoni: Yes, 15...Be6 appears to be the fatal blunder, at least to us. But the move is understandable: you block a check by developing a piece and attacking the queen. The last thing you expect to see next is a rook dancing up and down the 7th rank.
Jul-06-12  choklat: The gambit is nice try if you don't use any prog, rights?
Jan-16-13
Premium Chessgames Member
  FSR: Houdini 3 also gives 12...Nxc3! as winning (-2.05). In the game continuation, it says that 15...Ke8! gives Black a large advantage (-.87), and 15...Kg6 also favors Black (-.50). After 15...Be6?, it instantly announces mate in 11 with 16.Rxb7+!
Sep-20-18  wtpy: Got this one much quicker than yesterday's and the game followed my analysis through 19 fe5+. Didn't anticipate 19 ..Bf6 but black had no better defensive options.
Sep-20-18
Premium Chessgames Member
  al wazir: This is "medium"?

I got the first move, but I expected black to play 16...Nxb7, so I didn't look at 16...Kg8.

Sep-20-18  Walter Glattke: White can play 18.Qxa8+ Kf7 19.Qa7+ Kg6 20.Nxd6+ Kh5 21.Qxg7 mating, but black then escapes with 19.-Bd7 20.Nxd6+ Ke6 or 20.fxe5 Qxe5 21.Nxd6++ Ke6. The match ends with 21.Qxd6+ Ke8 22.Rxe6++ Kf7 (NxR Qe7#) 23.Re7+ Kg8 24.Qd5+ Kf8 25.Qf7# or Qxa8# or 24.-Ne6 25.Qxe6+ Kf8 26.Qf7# or 23.Kf8 24.Qf6+ Kg8 25.Qg7#
Sep-20-18  Autoreparaturwerkbau: Jan-19-12 <Phony Benoni: Yes, 15...Be6 appears to be the fatal blunder>

Agreed. Computer says 15...Be6?? was the move that turned white's eval -2,10 nightmare (around two pawns behind) into mate-in-11.

Sep-20-18  Boerboel Guy: "He who takes the Queen's Knight pawn sleeps in the streets" (..or the gutter!).
Sep-20-18  gofer: It's only when you realise how much work Be6 is doing that it becomes a little clearer that it is significantly overworked. So this starts to imply that Qd6 doesn't need to defend Nf5, because in some scenarios Nf5 is immune!

<16 Rxb7+ ...>

White is already down a bishop and now throws a rook into the mixer too.

Refusing the sacrifice leads to mate in about 8 or 9 more depending on where the king wanders off to. The nicest is probably <16 ... Kg8 17 Rxg7+ Bxg7 18 Ne7+!!! Kf7 19 fxe5+ Bf5 20 Rxf5+ Ke6 21 Qd5+ Kd7 22 Qxd6+ Ke8 23 Qc6+ Kd8 (Nd7 24 Qxa8+ mating) 24 Nd5+ mating>

<16 ... Nxb7>

Okay, now I come to a slight cross-roads. Can I really risk going R+N+B down to open up black's king even more with Nxd6+??? Probably not, because that just brings Nb7 back into the action. But what about Nh6+!!!

<17 Nh6+!!! gxh6>

<18 fxe5+ Kg7>

<19 Bxh6! Kxh6>

<20 Qxe6+ mating>

~~~

Yep. Very Pretty!

Sep-20-18  mel gibson: What an amazing game.
The Black Queen got too greedy taking all those pawns - letting the b file open up for White's Rook was the killer.
Sep-20-18  patzer2: Completely missed this "medium" Thursday puzzle.

I considered 16. Rxb7!! Nxb7 17. Qxb7?+ Kg8 18. Qxa8 Qc5+! (not 18...Bxf5?? 19. Qd5+ Be6 20. Qxe6#) 19. Kh1 Bxf5 -+ (-4.52 @ 30 ply, Stockfish 9), but that's obviously winning for black.

What I missed was 16. Rxb7!! Nxb7 17. Nh6+! +- (mate-in-six, Stockfish 9) with a neat, 6-move or less mating web.

I also did not expect 16...Kg8, when 17. Rxg7+! (mate-in-10, Stockfish 9) forces mate.

P.S.: So where did Black go wrong? The losing move was 15...Be6?, allowing today's, Thursday solution 16. Rxb7+!! +- (mate-in-ten).

Instead, 15...Ke8 ∓ (-0.92 @ 34 ply, Stockfish 9) would have left Black with the better game.

Earlier, Black could have had winning chances with 12...Nxc3! 13. Nd4 Ne2+ 14. Bxe2 Qc5 15. Rfd1 f6 16. Rbc1 Qb6 17.Bh4 exd4 -?+ to -+ (-2.19 @ 34 ply, Stockfish 9).

Sep-20-18  dumbgai: <mel gibson: What an amazing game. The Black Queen got too greedy taking all those pawns - letting the b file open up for White's Rook was the killer.>

Not really. As others have pointed out, black was winning until 15...Be6.

Sep-20-18  Strelets: I really need to take a closer look at Kotronias' games. He's been in two puzzles this week and they've both been really impressive.
Sep-20-18  Walter Glattke: 15.-Ke8 16.Nxd6+ (BxN Qf7#) Kd7 17.Nb5+ Ke8/Bd6 18.Nxc3 did you mean 15.-Ke8, and 15.-Be6 is a blunder!?
Sep-20-18  Walter Glattke: Ah, I overlooked Pf4
Sep-20-18  Walter Glattke: 15.-Ke8 16.Nxd6+ Bxd6 17.Qxd6 Qd4+ 18.Qxd4 exd4 19.Rfe1+ Kf7!? 20.Re7+ Kf8 always better than 15.-Be6, The sac Bxf7+ seems to be incorrect.
Sep-20-18
Premium Chessgames Member
  Jimfromprovidence: FYI...There are two beautiful ways for white to mate after 16 Rxb7+ Kg6.


click for larger view

Sep-20-18
Premium Chessgames Member
  agb2002: White is one bishop and two pawns down.

Black threatens Bxd5.

The black knight protects b7 and e6. This suggests 16.Rxb7+:

A) 16... Nxb7 17.Nh6+ (17.Qxb7+ Kg8 -17... Ke8 18.Nxg7+ Bxg7 19.Qe7#- and the attack seems to vanish -18.Qxa8 Qc5+ 19.Kh8 Bxf5-) 17... gxh6 (else 18.Qxe6+ looks winning) 18.fxe5 followed by Qxe6 seems to win.

B) 16... Ke8 17.Qc6+ Bd7 (17...Nd7 18.Qxc3 wins) 18.Rxd7 Nxd7 (due to Re7+ etc.) 19.Qxc3 wins.

C) 16... Kg8 17.Rxg7+ Bxg7 18.Ne7+ Kf7(8) 19.fxe5+ Ke8 20.Qxa8+ Kd7 21.Qc6+ Kd8 22.Qc8#.

D) 16... Kh5 17.Nh4+ Kh5 18.g4+ Bxg4 (18... Kxg4 19.Qd1+ Kh3 20.Rf3+ and mate next) 19.Qf7+ g6 20.Qxh7+ Rxh7 21.Rxh7#.

Sep-20-18
Premium Chessgames Member
  agb2002: My line D should say 16... Kg6.

<Jim> I don't see the second way.

Sep-20-18
Premium Chessgames Member
  agb2002: I overlooked the black bishop in my line D: 21.Rxh7+ Bh6 22.Rxh6#.
Sep-20-18
Premium Chessgames Member
  Jimfromprovidence: <agb2002> <Jim> <I don't see the second way.>

It's really sublime, Antonio.

After 16 Rxb7+ Kg6...

1) mate-in-6 (21 ply) 17.Nh4+ Kh5 18.g4+ Bxg4 (18...Kxg4 19 Qd1+ etc.) 19.Qf7+ g6 20.Qxh7+ Rxh7 21.Rxh7+ Bh6 22.Rxh6#


click for larger view

Sep-20-18  BxChess: <agb2002> <Jim> There is a third line:
16. Rxb7+ Kg6
17. Nh4+ Kh5
18. Qd1+ Bg4
19. Qxg4+ Kxg4
20. h3+ Kg3
21. Nf5#
Sep-21-18
Premium Chessgames Member
  agb2002: <Jimfromprovidence: <agb2002> <Jim> <I don't see the second way.>

It's really sublime, Antonio.

After 16 Rxb7+ Kg6...

1) mate-in-6 (21 ply) 17.Nh4+ Kh5 18.g4+ Bxg4 (18...Kxg4 19 Qd1+ etc.) 19.Qf7+ g6 20.Qxh7+ Rxh7 21.Rxh7+ Bh6 22.Rxh6#>

That's the one I saw, except that Black's dsb disappeared momentarily from my mind!

<BxChess: <agb2002> <Jim> There is a third line: 16. Rxb7+ Kg6
17. Nh4+ Kh5
18. Qd1+ Bg4
19. Qxg4+ Kxg4
20. h3+ Kg3
21. Nf5#>

I discarded this one due to 20... Qxh3.

Sep-21-18
Premium Chessgames Member
  agb2002: <Jim> The second line you mentioned is the one I was unable to find.
Sep-21-18  mel gibson: <Sep-20-18 dumbgai: <mel gibson: What an amazing game. The Black Queen got too greedy taking all those pawns - letting the b file open up for White's Rook was the killer.>

Not really. As others have pointed out, black was winning until 15...Be6.>

Still - many a game was won by luring a Queen out to take pawns.

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