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Karen H Grigoryan vs Tigran L Petrosian
77th ch-ARM HL (2017), Yerevan ARM, rd 3, Jan-14
Caro-Kann Defense: Advance. Tal Variation (B12)  ·  1-0



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sac: 23.Ncd6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Apr-26-18  ChessHigherCat: Well I got the first couple moves and then outfoxed myself with an overly ambitious plan. It really was about trapping the queen after all.
Apr-26-18  RKnight: The queen "trap" 23 Nc3, which costs a N and R is not a clear win, Engine doesn't think so either. But I guess it's best play in this position.
Premium Chessgames Member
  al wazir: The black ♕ clearly had few safe squares, so I looked first for a way to trap it.

And missed it.

But I think black should still have been able to draw. After 37. Qe3 c5, white can win a ♙ with 38. Nxc5 Rxc5 39. Qxd4, but now black connects the ♖s with 39...Rfc8, and the position looks blocked:

click for larger view

Apr-26-18  diagonalley: <al wazir> ... me too (as usual!)
Premium Chessgames Member
  agb2002: Black threatens Nxd4 and Nxh4.

The black queen looks nearly trapped. This suggests 23.Ncd6:

A) 23... Nxd6 24.Nc3

A.1) 24... Qb(c)4 25.Ra4 wins the queen for a rook and a knight.

A.2) 24... Nef5 25.Nxb5 (25.exd6 Qb4) 25... Nxb5 26.Qxc6 wins decisive material.

B) 23... Qb4 24.Ra4 Nxd4 25.Rxd4 wins decisive material.

C) 23... Qd5 24.Nc3 Nxd4 25.Nxd5 Nxc2 26.Nxe7+ Kh7 27.Ra6 wins decisive material.

Apr-26-18  patzer2: I could see White's Queen was nearly trapped, but it took me a while to find 23. Ncd6 Nxd6 24. Nc3 ± (+1.25 @ 36 ply, Stockfish 9 analysis of move 23.?) and exploit this weakness.

If 23...Qd5, then 24. Nc3 +- (+2.46 @ 23 ply, Stockfish 9 analysis of move 24...?) looks to be decisive.

Apr-26-18  patzer2: Black's mistake appears to be the recapture 22...axb6?, which allows today's Thursday puzzle solution 23. Ncd6 ± to +-.

Instead, 22...Nxd4 gives Black good practical counter chances at stealing the initiative. It (i.e. 22...Nxd4) also forces White to find many difficult moves, starting with 23. Qd3 = to ⩲ (+0.20 @ 33 ply, Stockfish 9 analysis of move 22...?), just to hold the balance slightly in his favor.

Premium Chessgames Member
  whiteshark: <al wazir: ... But I think black should still have been able to draw. After 37. Qe3 c5, white can win a ♙ with ...>

After <37.Qe3 c5> white can also switch for the kingside and go after black's ♔ with <38.Qg5>

click for larger view

b e.g. <38...Ra8 39.Nf6+ Kf8 40.Nxh5 g6 41.Nf6>

click for larger view

Nothing decisive after e.g. <41...Nc6 42.Qh6+ Ke7 43.Qe3 Raa2 44.Ne4>, but all a worthy alternative to think of.

Apr-26-18  ndg2: What's wrong with 22.Nc3 Qxc4 23.Ra4? Doesnt that ein the same amount of Material?
Apr-26-18  newzild: <ndg2>

Unfortunately, the Black queen can escape with 23...Qa6.

Apr-26-18  latebishop: I also thought that 22. Nc3 Qxc4 23.Ra4 wins but unfortunately 23...Nxd4 complicates things.
Apr-26-18  saturn2: Saw this one. 23 Ncd6 and the two subsequent moves catch the black queen at the price of N+R
Apr-26-18  mel gibson: I didn't know what to play.

Stockfish 9 follows the same line
but gives less than a 1 pawn advantage.

23. Ncd6

(23. Ncd6 (♘c4-d6 ♘f5xd6 ♘e4-c3
♕b5-b4 ♖a1-a4 ♕b4xa4 ♘c3xa4 ♘d6-f5 ♘a4xb6 ♘f5xh4 ♖d1-d3 ♘h4-f5 ♕c2-d2 ♖f8-e8 g2-g3 ♖d8-b8 ♘b6-d7 ♖b8-d8 ♘d7-c5 ♖d8-d5 ♘c5-e4 ♖e8-d8 ♕d2-g5 ♖d5xd4 ♖d3xd4 ♖d8xd4 ♘e4-f6+ ♔g8-f8 ♘f6-h7+ ♔f8-e8 ♕g5xh5 ♘e7-g6 ♘h7-g5 ♔e8-e7 ♕h5-e2 ♖d4-d5 ♘g5-f3 c6-c5 ♕e2-a6 ♘g6xe5 ♘f3xe5 ♖d5xe5) +0.81/33 163)

score for White +0.81 depth 33

Premium Chessgames Member
  malt: Gathered todays POTD was to trap the Queen.
23.Ncd6 N:d6 (23...Qd5 24.Nc3 R:d6 25.N:d5 R:d5 )

24.Nc3 Qc4 25 Ra4

Premium Chessgames Member
  malt: Missed
23...Qd5 24.Nc3 N:d4 25.N:d5 N:c2
26.N:e7+ Kh7 27.Rac1 Nb4 28.N:c6
Apr-26-18  njchess: I got the queen trap, but I wasn't sure that was a winning strategy given the material exchange and the resulting position. I thought Black should be able to hide behind his pawns, apply pressure to White's queen, while keeping his knight's out of harms way. I was wrong.
Apr-26-18  saturn2: I played over the game now. 34 Qb3 seems a serious mistake.
Apr-26-18  Reisswolf: I don't think it was a good puzzle. I got the general idea, but I feel that a good puzzle should have a more forcing continuation.
Apr-26-18  messachess: Tough one.
Apr-26-18  swclark25: <saturn2> 34.Qd3 also looked odd to me. What would you think better? 34.Qxc6 or exchange Knights with 34.Nxc3 ?
Apr-26-18  cormier:

click for larger view

Analysis by Houdini 4
16...f6 17.Be3 Rd8 18.Qd3 Nb4 19.Qb3 Nd5 20.Qd3 = (0.00) Depth: 22 dpa

Apr-26-18  mel gibson: < Reisswolf: I don't think it was a good puzzle. I got the general idea, but I feel that a good puzzle should have a more forcing continuation.>

Yes a gain of less than a pawn in 33 plies is hardly a chess puzzle.

Apr-26-18  lost in space: missed this
Premium Chessgames Member
  al wazir: <whiteshark: 37. Qe3 c5 38.Qg5.>

That's certainly an improvement. But after 38...Nf5 39. Nf6+ Kh8 40. Qxh5+ Nh6, what does white do?

Premium Chessgames Member
  whiteshark: <al wazir: 37.Qe3 c5 38.Qg5. But after 38...Nf5 39. Nf6+ Kh8 40. Qxh5+ Nh6, what does white do?> 41.g4 followed by 42.g5. You can't take ♘f6 due to #. Thus you'll drop ♘h6. You may hope for a ♖♖'7th heaven perpetual' but I don't see it after a Ne4 (or Ng4) retreat.
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