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Nathan Birnboim vs Roman Dzindzichashvili
Netanya (1977), Netanya ISR, rd 8, May-31
King's Indian Defense: Orthodox Variation. General (E91)  ·  1-0



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sac: 25.Ne4 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Premium Chessgames Member
  GrahamClayton: 26. e6 completes a pawn chain that completely splits the Black position in two.
Jul-09-16  Kashew: Nice game by NB - I've been looking at his quite brilliant Catalan v Shternberg, Israel 1982 in Informator 35.
Sep-12-20  Walter Glattke: At the first website I found a perpetual with 25.Ng3 bxc3 26.Nxf5 gxf5 27.Rg3+ Ng6 28.Rxg6+ hxg6 29.Qxg6+, therefore, 25.Ne4, threatens Ng5. 25.-fxe5 26.f5 gxf5 27.Nf4 e6 28.Rg3+ Ng6 29.Nxg6 Qc7 30.Ne7++ Kf7 31.Qg7# or 25.Ne4 e6 26.Nf6+ Kf7 27.Qxh7 Nxh7 28.Rxh7# or 26.-Qxf6 27.exf6 mate next. They played 25.Ne4 fxe4 26.e6 so they black defense is closed out. 26.-Nc6 27.f5 Ne5 28.fxg6 Ng4 (28.-Nxg6 29.Rf1 a5 30.Rf7) 29.gxh7+ Kh8, and now the incredible queen sac 30.Qg7+ could follow 30.-Kxg7 31.h8Q+ Kg6 32.Qg8+ Kf5 33.Rf1+ Nf2 34.Rxf2#25.Ne4 Nc6 26.Ng5 also wins.
Sep-12-20  mel gibson: Didn't see it.
I thought g2-g4 but that is about even according to Stockfish 12.

Stockfish 12 agrees with the text and says:

25. Ne4

(25. Ne4 (♘c3-e4
d6xe5 ♘e4-g5 ♕d8-d6 ♘g5xh7 g6-g5 ♕h6xg5+ ♕d6-g6 f4xe5 ♕g6xg5 ♘h7xg5 e7-e6 ♖h3-g3 e6xd5 c4xd5 ♘f8-g6 e5-e6 ♖a8-d8 ♘g5-f7 ♖d8xd5 ♖g3xg6+ ♔g8-f8 ♘f7-h6 ♘a5-c6 ♘e2-f4 ♘c6-e7 ♖g6-f6+ ♔f8-g7 ♘f4-h5+ ♔g7-h7 ♖b1-e1 f5-f4 ♘h5xf4 ♔h7-g7 ♘f4xd5 ♘e7xd5 ♖f6-f5 ♘d5-e7 ♖f5-h5 c5-c4 b3xc4 ♖e8-d8 ♘h6-g4 ♖d8-d6 ♖h5-g5+ ♔g7-f8 c4-c5 ♖d6-d3 ♔g1-f2 ♖d3-a3 ♖e1-e2 ♘e7-c6) +9.25/39 135)

score for White +9.25 depth 39

Sep-12-20  Brenin: After e6, Black was helpless: getting the N on a5 across to help defend the K was ingenious, but it was a lost cause, and White could just ignore it. 30 Qg7+ was a pretty end to the attack: after 30 ... Kxg7 31 h8=Q+ Kg6, White has at least four mates in 3, by 32 Qh5+, Qg8+, Rh5 and Rf1.
Premium Chessgames Member
  agb2002: Black threatens Bxc3 and e6, enabling the second rank for the defense.

These details suggest 25.Ne4:

A) 25... e6 26.Nf6+ wins an exchange at least.

B) 25... fxe4 26.e6

B.1) 26... Nb7 (with the idea Qc8-Nd8-Ndxe6) 27.f5 gxf5 (due to fxg6, winning) 28.Rg3+ Ng6 29.Nf4 wins.

B.2) 26... Nc6 27.dxc6 Qc8 (27... Nxe6 28.Qxh7+ Kf8 29.Qxg6 wins) 28.f5 gxf6 (28... Qxc6 29.fxg6, followed by g7, wins) 29.Nf4, with the threat Rg3+, looks winning.

C) 25... dxe5 26.Ng5 e6 27.Nxh7 exposes the black king (27... Ra7 28.Nxf8 Rxf8 29.Qh8+ Kf7 30.Qh7+ Ke8 31.Qxa7 wins).

Premium Chessgames Member
  thegoodanarchist: 25.Ne4 really is the only decent try.
Sep-12-20  saturn2: I went with 25 Ne4 fxe4 (pretty forced)  26. f5 gxf5 27. e6 black has a knight more but seemed lost to me. How tio defend against Rg3 Ng6 Nf4?
Premium Chessgames Member
  Predrag3141: I expected 25 Ne4 fxe4 26 e6 Nc6 27 Ng3, figuring there is no limit to the time White has to press his attack, and I didn't like 27 f5 allowing Black's knight into the defense.

But Stockfish agrees with 27 f5 as played, because it also allows White's rook into the attack, should Black recapture 28 ... Nexg6.

After my 27 Ng3, Stockfish gives White only a pawn advantage and suggests 27 ... Qa5. Can harassing a2 gin up enough counterplay? Really? Well it's Stockfish saying this, so it probably does, though I didn't delve further.

Sep-12-20  morfishine: The maneuver <25.Nd1> - <26.Ne3> looks playable
Premium Chessgames Member
  Predrag3141: < saturn2: I went with 25 Ne4 fxe4 26. f5>

It is important for White to prevent ... e6, which allows Black to defend along his second rank. 25 Ne4 and 26 e6 both prevent ... e6, but 26 f5 doesn't.

Sep-12-20  drnooo: doesnt knifht to g3 also work
Sep-12-20  drnooo: after pawn takes knifht then knifht at g3 takes at f 5 pawn takes rook checks knight interposes rook takes knight pawn takes rook queen takes pawn check king moves rook to b 1 and theres no stopping to rook lift to mate
Sep-12-20  TheaN: Had the feeling it had to be <25.Ne4 +-> but I didn't spend enough time to calculate the 26th move. Wanted to play 26.f5 ±, which isn't terrible but 26.e6 +- is completely done.

<drnooo: doesnt knifht to g3 also work (..._) after pawn takes knifht then knifht at g3 takes at f 5 pawn takes rook checks knight interposes rook takes knight pawn takes rook queen takes pawn check king moves rook to b 1 and theres no stopping to rook lift to mate>

Not preventing e6 means no quick win. After 25.Ne4 fxe4 26.Ng3 (which I assume you mean) e6 ⩲ White is quite a bit better but not won just yet.

Worth of note: presenting a line like this is very exhausting to go through. In fact, I think you miss Black's 26th move: "after pawn takes knifht then knifht at g3 takes at f 5 pawn" 25.Ne4 fxe4 26.Ng3, 27.Nf5 (which is not a capture), so I'm not sure if I'm reviewing the correct line.

Sep-12-20  messachess: Got the first move, but not the last!
Sep-12-20  MostlyWatch: White's attack works because Black's heavy pieces are mostly bottled up on the left while his king's on the right with a light defense and White has worked to get his queen and rook over there. There's even a song about that diagonal wall of pawns! Why We Build the Wall by Anaïs Mitchell, It's on YouTube

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