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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]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jul-06-12  choklat: The gambit is nice try if you don't use any prog, rights?
Jan-16-13  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
Premium Chessgames Member
  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
Premium Chessgames Member
  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
Premium Chessgames Member
  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
Premium Chessgames Member
  chrisowen: Blotch vinty cinch bindy linky lunkum rb7um blubbons blockvis lunks its a bivvin 16.Rxb7+ visage foody lunkum bunghost budum 11 ousty keyat blotch cuttle clung glock pudsy cover jilly jobum bowum vinty winum wonat nowum windy vinty boneyquery roxon dooty heavy fezum it's vasty vivar flavy heart knicks buffy puffs it's vasty heiry tensy vivar flavy cubby flippy waits visage prefab oveny vinty cabum fresh pinty brevity cowin vinty vowum vimum vetty ferny pithy pinky vehement firths branch rb7um blubbons vinty bindy keyat blockvis blotch vinty tucky cutty clung glock pukka vinty pudsy dupsy dusty dumby jilly jobum bowum wobble winum vinty neyer videy every query roxon dooty heavy hearty fezum it's vasty vivar flavy heart knicks buffy puffy vinty oveny lunks its a bivvin 16.Rxb7+ visage foody lunkum bunghost budum 11 ousty vinty found fondy fondue flood foody fundy guvnub doffy lunkum rb7um blubbons blockvis bloodlog bufflogs bonghood blushhog bullhood bombpods bondhood broughts cover lunkum bosslugs buntlong bowllogs vinty lunkum goofy guffy flung lunks its a evict 15Be6 visage cover vetsy effects budum 12 ousty lunks its a giver 15Kg6 visage keyat affect gufflog 3 4 it ok hover overt floggy grubby vueum keuco gobby vinty bungy boggy flubby bungys vinty bulky linky bully blond docky ducky dovey dusky dinky lowum mooty youth dutch commodore plummy humpive bunghive pound wound hound condiment vinty bouty dukey bindy bourbon huddle hoody dutch duddy cubby cobby clung cogum chuff goofy guffy flung foggy block bucky umsum joffy vinty abbey edits it was caitlins visage glamour cinch blotch rb7um blockhog?
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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