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Igor Viktorovich Kovalenko vs Laurent Fressinet
European Individual Championship (2016), Gjakova KOS, rd 10, May-22
English Opening: King's English. Four Knights Variation Fianchetto Lines (A29)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jan-26-18  actinia: <areknames>, 31. Bxc5 might be a tempo more murderous
Jan-26-18
Premium Chessgames Member
  wtpy: I saw the game solution, but Bc5 seems winning as well. Since Bc5 is also the most obvious move, I think that makes this a problematic problem.
Jan-26-18  mel gibson: <Jan-26-18 actinia: I went with 31. Bxc5 and do not see much of a difference as of yet...>

You're right -
only half a point less than the solution.

Stockfish 8 says:

(31. Bxc5 Ra5
(♖a4-a5 ♖b1-c1 e5-e4 ♕g6xe4 ♖a5-a6 ♗c5-b6 ♖a6xb6 ♖b8xb6 ♕f7xh5 ♔g1-g2 ♕h5-e5 ♕e4xe5 f6xe5 ♔g2-f3 ♘d8-f7 ♔f3-e4 ♔g8-h7 f2-f3 ♘f7-g5+ ♔e4-e3 ♖d7-a7 ♖c1-c5 ♖a7-e7 g3-g4 ♘g5-f7 ♖c5-b5 ♘f7-g5 ♖b6-a6 ♔h7-g8 ♖a6-a5 ♘g5-f7 ♖a5-a8+ ♔g8-h7 ♖a8-a6 ♔h7-g8 ♖b5-b8+ ♔g8-h7 ♖b8-b6 ♘f7-g5 ♖a6-a5 ♘g5-f7 ♖a5-c5 ♖e7-d7 ♔e3-f2 ♖d7-e7 ♖b6-c6 ♔h7-g8 ♖c5-b5 ♔g8-f8 ♖c6-c8+ ♖e7-e8) -3.41/37 65)

score for Black -3.41 depth 37

Jan-26-18
Premium Chessgames Member
  patzer2: For today's Friday puzzle (31. ?), I correctly played guess-the-move with the game continuation.

However, I wasn't sure whether 32. Kh2! +- was that much better than 32. Kg2 +-. I went with 32. Kh2! just to avoid the complications of the Queen check that would follow. I guess that was correct as the computer favors 32. Kh2! as winning by seven pawns as compared to about three and one-half pawns for 32. Kg2 +-.

P.S.: Black's game starts to go bad with 23...c5? allowing White to play the obvious 24. dxc5 ± and gain control of the b file for a near decisive advantage. Instead, 23...Re8 ⩲ would have kept it near level.

According to the computer, the losing move was 31...Rxa4? allowing our winning puzzle solution 32. R1b7! +- (+3.56 @ 34 ply, Stockfish 8). Instead, 30...Rxb8 31. Rxb8 ± to +- (+1.75 @ 37 ply, Stockfish 8) puts up much more resistance.

Jan-26-18  actinia: <mel gibson> after 10 or 20 more ply?
Jan-26-18  AlicesKnight: 31.R1b7 looks interesting. Let's see - yes, the pin is inescapable.
Jan-26-18
Premium Chessgames Member
  agb2002: White has a bishop for a knight and a pawn.

The rook on d7 protects the knight. Therefore, 31.Rb7:

A) 31... Qxg6 32.hxg6 Rd1+ (32... Rxb7 33.Rxd8#; 32... Ra7 33.Rxa7 wins) 33.Kg2

A.1) 33... c4 34.Re7 Kf8 35.Bc5 wins (35... Ra5 36.Rd7+ and mate next).

A.2) 33... Ra5 34.Rc7 c4 35.Rcc8 Rad5 36.Bb6

A.2.a) 36... c3 37.Rxd8+ Rxd8 38.Bxd8 and mate in two.

A.2.b) 36... Kf8 37.Rxd8+ Rxd8 38.Bxd8 Ke8 39.Bxf6+ Kd7 40.Rd8+ and 41.Rxd1 wins.

B) 31... Rd1+ 32.Kg2 Qxg6 transposes to A.

C) 31... Ra1+ 32.Kg2 Rad1 33.Rxd8+ wins.

Jan-26-18
Premium Chessgames Member
  gofer: My only concern was whether there was something I was missing...

<31 R1b7 ...>

31 ... Rxb7?
32 Rxd8+ Qf8
33 Rxf8+ Kxf8
34 Bxc4+ Kg8
35 Qd8+ Kh7
36 Qxa4 +-

So perhaps move the Ra4 first!?

<31 ... Ra1+>
<32 Kh2 ...>

32 ... Rxb7?
33 Rxd8+ Qf8
34 Rxf8+ Kxf8
35 Bxc4+ +-

Better, but still not great, perhaps black might survive this in the short term, but once white's pawns start rolling its not looking good for black. So perhaps supporting the poor pinned rook might help?!

32 ... Rad1
33 Rxd8+! +-

<32 ... Qxg6>
<33 hxg6 Rad1>
<34 Rxd7 ...>

When the dust settles, black can resign, his king won't be able to come across to defend the knight.

34 ... Rxd7
35 Bxc5 +-

~~~

Yep.

Jan-26-18  JohnBoy: <FSR>: while having potentially racist undertones, Cordoned Negro is a great pun. Freixenet is a wine maker in Barcelona, with a sekt - cordon negro - widely available in Europe & the US. If black had a great escape (and I intend to search Fressinet ‘s games), “I am not your Cordoned Negro” would be really quite funny.

Can’t we all just get along?

Jan-26-18  mel gibson: < actinia: <mel gibson> after 10 or 20 more ply?>

Yes - depth 37 means 37 plies.

Quote
<score for Black -3.41 depth 37>

Jan-26-18  saturn2: Had 31 Rb7
a ..Rd1 32 Kh2 Qf8 33 Bc5 loss of queen
b ..RxRb7 32 RxNd8 loss of queen
c ..Ra1 32 Kh2 Rd1 33 RxN loss of queen
d..QxQ 32 hxQ Ra1 33 Kh2 Rd1 34 RxRd7 RxR 35 Bxc5 and the knight will be pinned
Jan-26-18  actinia: <mel gibson> after that
Jan-26-18  WorstPlayerEver: Oh well... I wondered how many saw 31. R1b7 Ra1+ 32. Kh2 Rh1+ 33. Kxh1 Qd5+ 34. Kh2 Rxb7 35. Qxb7 36. Qe8+ Kh7 37. Qxd8 wins
Jan-26-18  diagonalley: hmmmmm... (not that difficult for a friday)... 31.R(1)-N7 is an elegant exploitation of the pin on the black knight and the black king's cramped quarters
Jan-26-18
Premium Chessgames Member
  Once: Not too hard today. The trick is to pile up on the pinned knight. White doesn't mind the exchange of queens as this brings a pawn to g6 and keeps the black king pinned down.

In the final position ...


click for larger view

... the killer sequence (for white) is Be7, Bxd8 and Bxf6#. Black can't do a great deal to stop this.

Jan-26-18  NBZ: Ah silly me. I saw Rb7 Rxb7 Rxd8+, but was thrown off by the sequence Rb7 Ra1+ Kh2 (Kg2 Qe4+ wins outright for Black) Qxg6 hxg6! (for some reason I only calculated Rxd7 which leads to Qxh5+ and mate).
Jan-26-18
Premium Chessgames Member
  Jimfromprovidence: I don't think anyone has analyzed this variation yet, which I found a bit tricky.

31 R1b7 Qxg6 32. hxg6 Rd1+ 33. Kg2 Rc4.


click for larger view

White to play and win.

Jan-26-18  saturn2: <Jimfromprovince> In your diagram I would play 34 Rc7
Jan-26-18
Premium Chessgames Member
  Check It Out: I saw 31.Rb7 - what I didn’t foresee was that in the final position the white bishop controls f8 so the black monarch cannot come to the aid of his desperate pieces.
Jan-26-18  lzromeu: The final position is a zugzwang, any other move and can't stop to lose the knight
Jan-26-18
Premium Chessgames Member
  Jimfromprovidence: <saturn2> <In your diagram I would play 34 Rc7>

I thought that white could answer 31 R1b7 Qxg6 32. hxg6 Rd1+ 33. Kg2 Rc4 34 Rc7 with 34...Kf8, below.


click for larger view

So if 35 Rcc8, then 35...Ke8 stops the attack.

I did not realize that if white instead tries 35 Bc5+, black cannot follow with 35...Ke8, because of 36 Re7+!, below, a forced mate.


click for larger view

So after 35 Bc5+, black has to give up a rook for a knight and is also left with the vulnerable pawn on g7.

Jan-26-18  Rama: It was tough to see through to the pattern of Pg6 restricting the King and the move Be7 after capturing on c5, winning material at least.
Jan-26-18  njchess: Brutal ending by White. I looked at this for a minute, only to be amused by the implications of 31. ♖1b7!. The final insult is ♗xc5 effectively pinning the king, and therefore Black's rook. I haven't looked at the game line, but Black's rook is condemned to the d-file no matter what happens.
Jan-26-18
Premium Chessgames Member
  FSR: <JohnBoy> It may well be a fine pun for those aware of the facts you cited (which I was not - I only knew that "Cordon Negro" was a kind of wine), but I suspect that the "potentially racist undertones" you mention will cause chessgames.com to reject it as a pun.
Jan-26-18  stst: Too busy .... Just try the first instinct...
Rb7 and that's it...
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