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Aleksey Dreev vs Luke McShane
Hastings 00 75th (2000), rd 5, Jan-08
King's Indian Defense: Saemisch. Bobotsov-Korchnoi-Petrosian Variation (E81)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Mar-28-21  Counterpoint: 19. Qh6!
Mar-28-21
Premium Chessgames Member
  An Englishman: Good Evening: Always strange when you solve a Sunday that the player did not. 5/7 for the week; maybe there's still hope for me three brain cells.
Mar-28-21  Walter Glattke: 19.d6+ Kg7 20.Nf5+ gxf5 21.Qg5+ Kh7 22.Qxf5+/Nd5/0-0/0-0-0 win, defence offside
Mar-28-21  Steve.Patzer: Oh yeah, I got that down to the last move....NOT. Qh6 wins.
Mar-28-21
Premium Chessgames Member
  al wazir: The puzzle position is move 19. I would have played 19. Qh6. If 19...Nf8, then 20. d6+ Be6 21. Bxe6+ Rxe6 22. O-O, with a view to 23. Nxh4.

But as the game went, after move 42 white is down two pieces for two ♙s. There's no way white should win.

And guess what? White lost.

Mar-28-21
Premium Chessgames Member
  carpovius: 19.d6+ Kg7 20. Nf5+ gxf5 21. Qg5+ Kh8 22. Qh6+ Nh7 23. Nd5 Qxb2 24. O-O Qg7
Mar-28-21
Premium Chessgames Member
  carpovius: Once I heard from Aleksey "I love insane positions"))
Mar-28-21
Premium Chessgames Member
  drollere: i went with 19. d6+ Kg7, 20. Nf5+ gxf5, 21. Qg5+ Kh7, 22. Bf7 Nf8, 23. Qxf6 Qxb2, 24. 0-0. if 19. Qh6 i'd try Nf8 20. d6+ Be6
Mar-28-21  mel gibson: Stockfish 13 chose the same move as me. 19.Qh6
(The text move is close to a draw
when Stockfish is forced to play it.)

19. Qh6

(19. Qh6
(♕d2-h6 ♘d7-f8 O-O ♕b6-d6 ♘c3xe4 ♖e8xe4 ♘g3xe4 ♕d6xh2+ ♔g1xh2 ♘f6-g4+ ♔h2-g1 ♘g4xh6 ♘e4xc5 ♗c8-g4 ♘c5xb7 ♘h6-f5 ♖a1-e1 ♖a8-b8 d5-d6+ ♔g8-g7 ♖e1-e7+ ♔g7-h6 b2-b3 h5-h4 ♖e7-c7 h4-h3 g2xh3 ♗g4xh3 ♖f1-f2 ♗h3-g4 ♖f2-h2+ ♔h6-g5 ♖h2-d2 ♘f5-h4 ♔g1-f2 ♘f8-d7 ♖d2-d5+ ♔g5-h6 ♔f2-g3 ♘h4-f5+ ♔g3xg4 ♘d7-f6+ ♔g4-f4 ♘f6xd5+ ♗c4xd5 ♖b8xb7 ♗d5xb7 ♘f5xd6 ♔f4-e5 ♘d6-f5 ♗b7-f3 ♔h6-g5 ♖c7xa7 ♘f5-e3 b3-b4 ♘e3-f5 b4-b5) +7.01/43 244)

score for White +7.01 depth 43

Mar-28-21  Brenin: I saw as far as 19 Qh6 Ne5 20 0-0, with the threat of 21 d6+, which seems a lot better for White than the line played.
Mar-28-21
Premium Chessgames Member
  carpovius: An instintinctive move 19.Qh6 wins.
Mar-28-21
Premium Chessgames Member
  malt: Would have played 19.Qh6 Nf8 20.0-0 (20.Rf1)

(20.d6+ Be6 )

Δ 21.d6+

Mar-28-21
Premium Chessgames Member
  chrisowen: Flick d6+ fond idle do arrive bob in i has Qh6 goof acrid ovid in flick dram in a hale heffalump flick again quagmire in oh bastion wobble juicy ovid viz its lid on maze vast hits in grew ein o add ghoul in edict difficult thaw it was warm air d6+ buff;
Mar-28-21  Walter Glattke: 19.Qh6 Ne5 20.0-0 Nfg4? 21.d6+ Nxc4 22.Qxg6+ Kh8 23.Rf7 Nf6 24.Qg7#, d6 disguards Pg6. 20.-Bf5 21.Nxf5 ++-.
Mar-28-21
Premium Chessgames Member
  agb2002: White is one pawn down.

Black threatens e3 and Ne5.

White has d6+, Qh6 and 0-0.

After 19.d6+ Kg7 20.Nf5+ gxf5 21.Qg5+ Kh8 22.Qh6+ Nh7 and White doesn't seem to have any compensation for the material.

In the case of 19.0-0 e3 blocks the weak diagonal, stopping White's attack. The alternative 19... Ne5 loses to 20.Qh6 Nfg4 21.d6+ Be6 (21... Nxc4 22.Qxg6+ Kh8 23.Qxe8+ and mate soon) 22.Rf8+ Rxf8 23.Bxe6+ Rf7 24.Bxf7+ Kxf7 25.Qh7+ Kf8 (else 26.Qe7#) 26.Rf1+ with a winning attack.

In the case of 19.Qh6:

A) 19... Ne5 20.d6+

A.1) 20... Nxc4 21.Qxg6+, followed by 22.Qxf6+ and Nxh5 or 0-0, looks winning.

A.2) 20... Be6 21.0-0 Bxc4 (21... Kf7 22.Ncxe4) 22.Rxf6, with the threat 23.Nf5 gxf5 24.Qg5+ and mate in two.

B) 19... Nf8 20.0-0 (20.d6+ Be6 helps Black) looks very good for White. For example, 20... Qd6 21.Ncxe4 Nxe4 (21... Rxe4 22.Nxe4 Nxe4 23.Rxf8+ as in the line) 22.Rae1 Nf6 23.Rxe8 Nxe8 24.Rxf8+ Qxf8 25.d6+ wins decisive material.

C) 19... Kf7 20.d6+ wins an exchange at least.

D) 19... Qxb2 20.d6+ and mate in two.

Mar-28-21  RandomVisitor: A deeper computer run shows Qh6, Qg5, 0-0 as the top 3 moves:


click for larger view

Stockfish_21032417_x64_modern:

<61/91 14:40:28 +7.97 19.Qh6 Nf8 20.0-0 Qd6 21.Nb5> Qe5 22.Nc7 Qd4+ 23.Kh1 Ng4 24.Qf4 Bd7 25.Nxa8 Rxa8 26.Nxe4 Qe5 27.Nxc5 Qxf4 28.Rxf4 Bf5 29.Re1 b6

60/104 14:40:28 +4.48 19.Qg5 Kh7 20.0-0 Re5 21.Qe3 Ng4 22.Qe2 Kg7 23.h3 Nh6 24.Qe3 Qd8 25.Ngxe4 Nf6 26.Rxf6 Qxf6 27.Qxh6+ Kxh6 28.Nxf6 Bf5 29.g4 hxg4

60/86 14:40:28 +2.00 19.0-0 e3 20.Qc2 Kg7 21.Rf4 h4 22.Nge4 Nh5 23.Rxh4 Ne5 24.Be2 Bf5 25.Rf1 Rf8 26.Nd1 c4 27.Qc3 Rae8 28.Nxe3 Nf6 29.Nxf6 Rxf6

Mar-28-21  olinart: 19.d6+ Kg7 20. Qg5 Ne5 21. Nf5+ Kh8
all forced
22. Qxg6 Bxf5 23. Qxf6+ Kh7 24. Qxf5+ Kh8 25. Qxh5+ Kg7 and white is up a knight with some attack
eg 26. O-O Nxc4 27. Qf7+ Kh8 28. Qxc4 Qxd6

If Stockfish didn't catch this I've missed some refutation

Mar-28-21  njchess: Wow. I got this really quickly. And given that it is move 19, I thought Dreev would have gotten it too (in other words, he's not under time control pressure). I'm not sure there is a defense for 19. Qh6! either. If there is, I suspect, as <agb2002> indicates, Black has a losing position. I bet McShane was sweating bullets!
Mar-28-21  Brenin: <Olinart>: If 19 d6+ Kg2 20 Qg5 then 20 ... Re5 21 Qe3 Qxd6 or 21 Qd2 e3 seem to refute White's attack.
Mar-28-21  alshatranji: That was really deep. I though of 19. Qh6. But I couldn't find a winning line after Ne5 20. d6+ Be6. The only move I could think of was 21. Nf5 gxf5 22. Qxf6, which doesn't go anywhere. But Stockfish has 21.O-O as wining at +4.84. I would not trust this quiet move in a real game attack. But of course I couldn't see that far ahead.
Mar-28-21  RandomVisitor: 19.d6+ Kg7 and there is nothing that leads to advantage:


click for larger view

Stockfish_21032417_x64_modern:

<68/57 2:23:26 -0.00 19...Kg7 20.Nb5 h4 21.Nc7> hxg3 22.Nxe8+ Nxe8 23.0-0-0 Nxd6 24.Qxd6 Qxd6 25.Rxd6 Ne5 26.Be2 gxh2 27.Rxh2 Nf7 28.Rd1 b6 29.Rh4 Bf5

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