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Konstantin Klaman vs Alexander Chistiakov
URS-ch sf Tbilisi (1949), Tbilisi URS, rd 2, Apr-??
French Defense: Advance Variation. Paulsen Attack (C02)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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Jan-21-16  Steve.Patzer: I saw the first move, but there are so many options for black's response.
Jan-21-16
Premium Chessgames Member
  al wazir: I don't understand 39...Qc6. If instead 39...Rc6, the f-♙ is pinned and white has to use a tempo to play 40. Kh5. Then after 40...Qc3 41. h4 Qc5 42. f5 Qe7, I think black's chances are pretty good.
Jan-21-16
Premium Chessgames Member
  al wazir: <Fish55>: OK, I see. 40. Kh6 threatens mate.
Jan-21-16  The17thPawn: <al wazir> - how do you respond to white just marching the h pawn straight away?
Jan-21-16  The17thPawn: Nevermind missed Kh6 also.
Jan-21-16  patzer2: Got the first move of today's Thursday puzzle with 39. Ng7!

However, after 39...Qc6, I missed the winning follow-up 40. f5! (+7.60 @ 20 depth, Deep Fritz 15).

My planned 40. h5? is too slow as it allows Black to survive with a draw by perpetual after 40. h5 Qd7 41. f5 (41. h5 Qe7 ) 41... exf5 42. Qh6 Qe7+ 43. Kh5 Qxe5 44. Nxf5+ Kg8 45. Qg5+ Kf8 46. Qh6+ Kg8 47. Qg5+ Kf8 48. Qh6+ =.

Black's decisive mistake is the not-so-obvious 34...Qxd4?

Instead, 34...Qd1 forces a draw by perpetual after 34... Qd1 35. Qg5+ Kf8 36. Qg7+ Ke8 37. Qg8+ Ke7 38. Qxc8 Qe1+ 39. Kf4 Qd2+ 40. Kg3 Qe1+ 41. Kg2 Qe2+ 42. Kg3 Qe1+ =.

Jan-21-16  patzer2: <Ron>'s 2007 comment about 29. Ra1? = is correct. Objectively, 29. Rd1 or 29. Re1 are better.
Jan-21-16  nalinw: LTJ I also thought of Ng7 and pushing the h pawn - but thought that Black has time to bring the Rook and Queen and attack from the rear.

If Black tries to exchange Queens White takes exf6 and the Blank King is still trapped and now the h pawn strolls home.

Jan-21-16
Premium Chessgames Member
  dorsnikov: If that puzzle was of "medium" difficulty, then I'm Bobby Fisher !
Jan-21-16
Premium Chessgames Member
  LoveThatJoker: <nalinw> Thanks for the mention. It was a tough puzzle for sure. So many possibilities for Black here.

LTJ

Jan-21-16  PJs Studio: This took some thought. I got whites moves but kept thinking blacks responses were inferior. 39...Rc6 looked better but 40. Kh6 is crushing. I do think 40...Re8 seems a bit more resolute. But then white wins easily by taking the rook and winning blacks f pawn with Qh8+ and Qf8! +\-
Jan-21-16  BOSTER: The Q is: can white win after 39...Re8?
The d5 pawn as strong as h3.
Jan-21-16  saturn2: Intuition or luck? I would also have played 39 Ng7
Jan-21-16  AvidChessMan: I struggled with this puzzle too. The key was to reposition the knight. I didn't see that and that black's best response was to shift the queen into king-protect-mode, to no avail.
Jan-21-16
Premium Chessgames Member
  Jimfromprovidence: It's not easy to see, but with the position after the text 39 Ng7, below, white threatens a beautiful forced mate.


click for larger view

For example purposes, if black plays 39...a5, white forces mate beginning with 40 Nxe6+ Ke8 41 Ng7+ Kf8 42 Nf5!


click for larger view

So black plays the text 39...Qc6 to prevent the forced mate.

FWIW, after 40 f5, black also has 40...Qc1+ as a defense.


click for larger view

Jan-21-16  kevin86: I was looking at a QUEEN check at g7...so I missed it.
Jan-21-16  agb2002: White has a knight and a pawn for a rook.

Black threatens to push the d-pawn.

The first idea that comes to mind is 39.Ng7:

A) 39... Rc6 40.Kh6 Rc8 41.Nxe6+ Ke8 (41... Kg8 42.Qg7#) 42.Ng7+ Kf8 (42... Kd7 43.Qd6#) 43.Nf5 wins.

B) 39... Qc6 40.f5

B.1) 40... exf5 41.e6 Qc7 (41... Rc7 42.e7+ Rxe7 43.Qxc6 wins) 42.Nf5 wins.

B.2) 40... Qd7 41.Nxe6+ Ke8 42.Ng7+ Kf8 43.e6 looks winning. For example, 43... Qe7 44.Qxe7+ Kxe7 45.f6+ results in a won pawn ending.

B.3) 40... Re8 41.Nxe8 with a much better Queen and pawn ending.

Jan-21-16  morfishine: <39.Ng7>
Jan-21-16  Tiggler: 39.Ng7 is the only move that threatens anything, But after that I missed the continuation f5.
Jan-21-16  Cheapo by the Dozen: Count me among those who went with Ng7 followed by an h-pawn march.
Jan-21-16  transpose: <Fish55> I am with you. I saw 39 Ng7 Rc6 then 40 Kh6 as the way to go.
Jan-21-16  TeaChess: 39. …… Re8 is the best defense
Jan-22-16  CHESSTTCAMPS: White has a material disadvantage of knight plus pawn for a rook, but the combination of N+Q often works well against a lightly defended king. Also, the advanced white king is well protected by a splendid pawn and piece shelter that is positioned to escort the passed h-pawn to promotion. Black's biggest threat appears to be the advance of the passed d-pawn.

white has one move that serves multiple purposes:

39.Ng7! Removes the knight from the promotion path of the h-pawn, keeps the black king from escaping from prison via e8, and threatens 40.Nxd6+.

A.39... d4 40.Nxd6+ Ke8 (Kg8 41.Qg7#) 41.Ng7+! (the pawn grab Nxd4 is unnecessary) Kf8 (Kd7 42.Qd6#) 42.Nf5 with no good defense to 43.Qh8# e.g. 42... Ke8 44.Qe7# or 42... Kg8 44.Qg7#)

B.39... Kg8 40.Kh6! Kf8 41.Nxd6+ Ke8 42.Ng7+ Kf8 (Kd7 43.Qd6#) 43.Nf5 Rc6 44.Nd6 Rxd6 45.exd6 wins

B.1 40... Qc3/e3/f1/h1 41.h4

B.2 40... other 41.Ne8 wins

B.3 43... Qc6 44.Nd6 Rc7 (Qb7/c7/d7 45.Qh8+ then 46.Qxc8; otherwise Qxf7#) 45.Qh8+ Ke7 46.Qe8#

Time for review....

Jan-22-16  CHESSTTCAMPS: Should have covered the game defense (39.Qc6).
Jan-23-16  Let The Wookiee Win: If black played 39...Re8, I would recommend 40.Qh6. That practically forces Ke7, after which I would play 41. Nf5 (if ef, then 42.Qd6#), with the idea of Nd6 to eventually win the f-pawn.
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