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Sergei Rublevsky vs Carlo D'Amore
Istanbul Olympiad (2000), Istanbul TUR, rd 2, Oct-29
Modern Defense: Standard Defense (B06)  ·  1-0



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sac: 9.Bxg5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Premium Chessgames Member
  louispaulsen88888888: But what if you use _13680753_x65536_cv-1492 CNNennui ?
Sep-05-20  Socrates2: Very nice double sacrifice.
Sep-05-20  mel gibson: I saw that move.

Stockfish 12 says:

9. Bxg5

(9. Bxg5 (♗h4xg5 b6-b5 ♗c4-d5 b5-b4 ♗g5-e3 ♖a8-b8 ♘c3-e2 e7-e6 ♗d5-b3 ♗c8-b7 ♘e2-g3 ♘g8-f6 d4-d5 e6xd5 e4xd5 ♘f6-g4 ♗e3-d4 ♕d8-e7+ ♔e1-f1 ♗g7xd4 ♕d1xd4 ♘g4-e5 ♖a1-e1 a6-a5 ♘f3xe5 d6xe5 ♕d4-e4 ♘d7-c5 ♕e4-f5 ♕e7-g5 h2-h4 ♕g5xf5 ♘g3xf5 e5-e4 ♗b3-c4 ♔e8-f8 h4-h5 ♖b8-e8) +3.03/31 95)

score for White +3.03 depth 31.

But if we follow the text reply 9...hxg5 then

9. ..hxg5

10. Bxf7+ (10. Bxf7+ (♗c4xf7+ ♔e8-f8 ♘f3xg5 ♘d7-f6 ♘g5-e6+ ♗c8xe6 ♗f7xe6 ♕d8-e8 g2-g4 c7-c5 ♕d1-f3 c5xd4 ♘c3-e2 ♕e8-c6 ♗e6-d5 ♕c6-c8 ♘e2xd4 ♔f8-e8 ♗d5-c6+ ♘f6-d7 e4-e5 ♗g7xe5 ♘d4-e6 ♘g8-h6 g4-g5 ♘h6-f7 g5-g6 ♘f7-d8 g6-g7 ♕c8xc6 g7xh8♕+ ♗e5xh8 ♕f3xc6 ♘d8xc6 ♘e6-c7+ ♔e8-f7 ♘c7xa8 ♗h8xb2 ♖a1-b1 ♗b2-c3+ ♔e1-e2 b6-b5 a4xb5 a6xb5 ♖h1-d1 b5-b4 ♘a8-c7) +4.39/33 86)

score for White +4.39 depth 33.

Sep-05-20  morfishine: Bout as good as it gets
Premium Chessgames Member
  agb2002: Black threatens gxh4.

The weak light squares in Black's position, the defenseless rook on a8 and the lack of mobility of the black queen almost surely justify 9.Bxg5 hxg5 10.Bxf7+

A) 10... Kxf7 11.Nxg5+

A.1) 11... Kf6 12.Qg4

A.1.a) 12... e6 13.Nxe6 looks winning (13... Qe7 14.Qf5#; 13... Ne5 or Nh6 14.Qxg7+ Kxe6 15.d5#).

A.1.b) 12... Nf8 13.Nd5+ Kg6 14.Ne6+ and mate in two.

A.2) 11... Kg6 12.Ne6 Qe8 13.Qg4+ Kf6 14.Qxg7+ Kxe6 15.d5#.

A.3) 11... Ke8 12.Ne6 wins decisive material.

A.4) 11... Kf8 12.Ne6+ as above.

B) 10... Kf8 11.Nxg5 Ndf6 (due to Ne6+) 12.Qf3 with the threat e5 looks winning (12... Bb7 13.Ne6+; 12... e5 13.dxe5 dxe5 14.Rd1).

Sep-05-20  vajeer: Interesting final position where both of White's knights and Queen are under attack, but Black is helpless.
Sep-05-20  RandomVisitor: In this run black escapes at the cost of being down the exchange. That is better than being down a king...

click for larger view

NNUE evaluation using nn-308d71810dff.nnue enabled

<51/72 3:35:11 +3.82 9.Bxg5 b5 10.Bd5 b4 11.Be3 Rb8 12.Ne2 Ngf6 13.Bc6 Rb6 14.d5 Rxc6 15.dxc6 Nb8 16.Ng3 Nxc6> 17.0-0 h5 18.h3 Bb7

Sep-05-20  RandomVisitor: <louispaulsen88888888: But what if you use _13680753_x65536_cv-1492 CNNennui ?>In that case you get a different answer.
Sep-05-20  RandomVisitor: Some words of advice on Stockfish. The new Stockfish 12 contains the neural net evaluation file embedded in the binary - you no longer have to go find it and load it.

Stockfish is now compressed into a zip file - you have to unzip it before you can run it. It also can switch between neural net evaluation and "classical" evaluation according to whichever works better. I use arena 3.5.1 as my user iterface, and some of my computers now are linux based.

At arena 3.5.1, you just select "engine" and then "install new engine" and then point to the directory where you downloaded and uncompressed stockfish. If you want you can download and install syzygy tablebases.

Sep-05-20  cormier: ths <RV>
Sep-05-20  Honey Blend: Black played like NN in the 1800s.
Premium Chessgames Member
  chrisowen: Brickwalls no?
Sep-05-20  bigwhiskey: great line...but 11....f6?? is amateur hour. Correct?
Sep-05-20  drollere: i went with 9. Bxf7+ straightaway.
Sep-05-20  Brenin: <bigwhiskey>: 11 ... Kf6 is an attempt to save Black's Q, since 11 ... Ke8 and Kf8 lose the Q to 12 Ne6, leaving Black with 2N+B and a horrible position versus Q+3P, while Kg6 leads to mate by 12 Qg4+, e.g. 12 ... Kf7 13 Qxg7+ Ke6 14 d5 or 12 ...Kh6 13 Qg5+ Kh7 14 Qxg7. The only legal alternative is 11 ... Kf6, as played. No doubt, Black was hoping that White's attack would run out of steam, leaving him two pieces down.
Sep-05-20  TheBish: I knew this looked familiar. Posted over 11 years ago!
Sep-05-20  TheaN: As a Modern player, I'm more than familiar that an early Nd7 can be disastrous. That the attack is dangerous to execute for White I noticed here, as I screwed up.

I pictured the h6-pawn still there in the text, playing 12.Qf3+?! Kxg5 13.h4+ Kh6 (the escape I missed, as I thought 13.Qf5+ Kg4?? 14.h3#) 14.Qf4+ Kh7 15.Qf5+ =.

Other than that, realizing the king's so exposed allows the double bishop sac: the queen trap is a notorious trap with the Nd7 setup, which is the main idea of 11.Nxg5+: all responses but Kf6 allow Ne6 with a trapped queen (after 11....Kg6 12.Ne6 Qe8? 13.Qg4+ with mate).

The Bishop Attack is simply the best example of this: 1.e4 g6 2.d4 Bg7 3.Bc4 d6 4.Nf3 Nd7?

click for larger view

5.Bxf7+! Kf8 (Kxf7 6.Ng5+ Ke8 (Kf6?? 7.Qf3#; Kf8 7.Ne6+ +-) 7.Ne6 +-) 6.Ng5 Nb6 7.Qf3 Nf6 8.e5 +-. Good opening trap to know.

Sep-05-20  Shrinarayanan: To find such a dominating winning combination from move 9 is really impressive.
Sep-05-20  RandomVisitor: After 1.e4 g6 2.d4 could black be already down more than half a pawn?

click for larger view

NNUE evaluation using nn-308d71810dff.nnue enabled

<50/61 4:51:34 +0.61 2...d6 3.Bd3 Nf6 4.Nf3 Bg7 5.0-0 0-0> 6.Re1 Re8 7.e5 Nd5 8.Ng5 dxe5 9.dxe5 Nc6 10.Bc4 e6 11.Qf3 Qe7

Sep-06-20  Thomas Van Winkle: Chess and soccer, the beautiful games.
Sep-06-20  TheBish: "I hate this game!" said Black (whose name literally means "of love").
Sep-06-20  Everett: A really nice checkmate
Sep-06-20  TheaN: <RV> objectively perhaps, but exactly these positions is where 'horizon' computers fall short. The Modern/Robatsch can transpose into the Hedgehog, and that same Hedgehog has seen evaluations well above +4 for White, yet no way to 'retain' that advantage by any attempt of a breakthrough (any longer evaluations actually diminish the advantage to nearly non-existent). The difficulty for White is restraint and for Black patience, but the positions have not been solved per se (which one would expect close to +5, even in short evals).

As for the main lines of the Robatsch; White is better. But the counterattacks are looming everywhere, and Black's far from lost.

Sep-07-20  Everett: <TheaN> You’d be hard-pressed to find any of the many solid programs out there giving +4 to a hedgehog position.
Premium Chessgames Member
  WTHarvey: White mates in 2.

click for larger view

16. ?

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