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Suri Vaibhav vs Pavle Dimic
World Junior Championship (2017), Tarvisio ITA, rd 3, Nov-15
King's Indian Attack: Symmetrical Defense (A05)  ·  1-0



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sac: 19.Ndf5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Mar-10-19  mel gibson: I could see that one of the Knights had to move to f5 but which one?

Stockfish 10 chose the other one.

19. Nef5

(♘e3-f5 g6xf5
♘d4xf5 ♖e8-e5 ♘f5xd6 ♖e5-e6 e4-e5 ♘f6-e8 ♘d6xc8 ♘d7xe5 ♗b2xe5 ♖e6xe5 ♖e1xe5 ♗g7xe5 ♕d2-g5+ ♗e5-g7 ♘c8-e7+ ♔g8-f8 ♘e7-f5 h7-h6 ♕g5-g4 ♕c7-e5 ♖d1-d7 ♖a8-b8 ♗g2-h3 b7-b5 ♕g4-h5 ♕e5-a1+ ♗h3-f1 ♕a1-f6 ♗f1-d3 ♕f6-e6 ♖d7-e7 ♘e8-f6 ♕h5-d1 ♕e6-d5 a4xb5 c6xb5 ♕d1-a1 ♕d5-c5) +4.05/35 )

score for White +4.05 depth 35

Mar-10-19  Patriot: I chose 19.Nef5.
Mar-10-19  ChessHigherCat: I didn't know which knight to move either. Beautiful sac at any rate.

I would have played 27. Bd4 because it looks more forcing, but SF rates 27. Re2 a full point higher for some reason.

Premium Chessgames Member
  al wazir: To my surprise I actually had the right general idea.

However, as so often is the case in the more difficult puzzles, I didn't foresee the defensive moves that were played. As black I think I might have played 20...Bh8 instead of 20...Re5.

Mar-10-19  Steve.Patzer: Stockfish has black with an advantage with 18....Nfxe4.
Mar-10-19  Walter Glattke: 19.Nef5 Ne5 20.f4 is white advantage in all variations
Mar-10-19  Viennablue: @Steve.Patzer: I also don‘t see why Black played 18....Ncd7 instead of 18....Ncxe4 or 18...Nfxe4
Mar-10-19  MrMelad: It was pretty obvious which knight to move, as moving only one of them opened up the d file. I didn't see the continuation, more accurately I didn't bother to calculate as it was beyond my power. But I got the first move right, hurray!
Mar-10-19  erichbf: I was with Stockfish chose Nef5.
Premium Chessgames Member
  thegoodanarchist: I guessed correctly.
Premium Chessgames Member
  agb2002: Black threatens Nxe4.

The move that catches the eye is 19.Nef5:

A) 19... gxf5 20.Nxf5

A.1) 20... Bf8 21.Qg5+ Kh8 22.Bxf6+ Nxf6 23.Qxf6+ Kg8 24.Qg5+ (24.Rxd6 Bxf5; 24.Nxd6 Re6 25.Qg5+ Rg6) Kh8 25.Nxd6 wins two pawns (25... Bxd6 26.Qf6+ Kg8 27.Rxd6).

A.2) 20... h6 (to stop Qh5) 21.Nxh6+

A.2.a) 21... Bxh6 22.Qxh6, with the ideas g4-g5, Bh3-Bxd7, Re3-Rf3, looks very good for White.

A.2.b) 21... Kf8 22.Nf5, with the threats Nxg7, Qg5 and Nxd6, also looks very good.

A.2.c) 21... Kh7(8) 22.Nf5 is similar to A.2.b.

B) 19... Bf8 20.Nh6+

B.1) 20... Bxh6 21.Qxh6 and the black castle is irremediably weakened.

B.2) 20... Kh8 21.Nxf7+ wins an important pawn.

B.3) 20... Kg7 21.Ndf5+ Kh8 (21... gxf5 22.Qg5+ Kh8 23.Qg8#) 22.Nxf7+ Kg8 23.Nxd6 wins two pawns.

Mar-10-19  landshark: I got the first 2 moves - the obvious ones - right but would have hesitated to do it in a real game. Then after 20... Re5 I deliberated between 21.Qg5 and 21.Nxd6 and chose the Q move on general principles of developing more of a menace on the K-side. I wonder how much worse of a move it is compared to what was played....
Mar-10-19  devere: <mel gibson: I could see that one of the Knights had to move to f5 but which one?>

19.Ndf5 is supported by the tactical calculation ...Nxe4 20.Nxg7 Nxd2 21.Nxe8 and White has winning compensation for his Queen. But 19...Bf8 is a slightly more effective reply to Ndf5 than it is to Nef5, which explains SF's choice. White has a winning advantage with either knight move.

Premium Chessgames Member
  whiteshark: Knife f5!

<19.Ndf5 gxf5 20.Nxf5 Re5 21.Nxd6>

click for larger view

Black to move

1) +3.00 (30 ply) 21...Re6 22.e5 Nxe5 23.Bxe5 Rxe5 24.Rxe5 Bg4 25.Rg5 h6 26.Rxg7+ Kxg7 27.Qf4 Rd8 28.Qe5 Be6 29.Rd4 Kf8 30.Qf4 Rd7 31.Bh3 Ke7 32.Bxe6 fxe6 33.Qxh6 Rxd6 34.Qg7+ Kd8 35.Qxf6+ Kc8 36.h4 Rxd4 37.Qxd4 Qd8 38.Qxd8+ Kxd8 39.h5 Ke7 40.f4 Kf6 41.Kf2 Kg7 42.g4 b5

2) +3.07 (29 ply) 21...h6 22.Nf5 Rxf5 23.exf5 Qd8 24.Bxf6 Qxf6 25.Re8+ Kh7 26.Rxc8 Rxc8 27.Qxd7 Rf8 28.Qxb7 Qxf5 29.Bxc6 Kg8 30.Be4 Qc8 31.Qb5 Rd8 32.Rxd8+ Qxd8 33.Qf5 Qg5 34.Qd7 Bf8 35.Kg2 Be7 36.Bd5 Qf6 37.c4 Bb4 38.Qg4+ Kh8 39.Be4 Qe6 40.Qh4

3) +3.14 (29 ply) 21...Rh5 22.Bf3 Re5 23.Qf4 Re7 24.Nf5 Qxf4 25.Nxe7+ Kf8 26.gxf4 Kxe7 27.f5 Bf8 28.Bd4 Ne8 29.e5 Nc7 30.Bh5 Bh6 31.Bb2 Nc5 32.e6 Bxe6 33.Kh1 Rg8 34.fxe6 N7xe6 35.Bf3 Rg5 36.Bc1 Rf5 37.Bg4 Rf6 38.Bb2 Rf4 39.f3 Kf8 40.Kg2

6.0 minute analysis by Stockfish 9 v010218

= = =

Know yer patterns: Game Collection: 70f5_middlegame N-SACS on f5

Mar-10-19  Cheapo by the Dozen: It was obvious how the answer had to start, but otherwise I whiffed on the puzzle completely. I didn't even stick with it long enough to see why the ... Nh5 defense didn't work.
Mar-10-19  Olavi: Te text of the game must be wrong. A far more plausible way to reach the diagram is 15.Ne3 Bg7 16.Rad1 Ned7 and 17.Ndf5.
Premium Chessgames Member
  PawnSac: < ChessHigherCat: I didn't know which knight to move either. Beautiful sac at any rate. >

I instinctively chose the E knight for the simple reason that it opens the c1-h6 diagonal for the Q. If black accepts the sac, it matters not which knight moves first as the remaining one ends up on f5 (and yes the D file is opened). I was just as interested in what would happen if the sac was refused. But admittedly it is very complex, with lots of possibilities.

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