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Ray Robson vs Yuri Vovk
World Cup (2015), Baku AZE, rd 1, Sep-11
French Defense: Steinitz. Boleslavsky Variation (C11)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Sep-12-15
Premium Chessgames Member
  whiteshark: GM <Jan Gustafsson> takes a look at the most spectacular Round 1 game: http://www.youtube.com/watch?v=ZO0O...
Sep-14-15  AdolfoAugusto: Indeed a great Game. Robson was totally surprised and put to the defensive. Somehow I feel that Wei Yi wil be ready and stop Vovk and his french Defence.
Sep-14-15  dumbgai: <Somehow I feel that Wei Yi wil be ready and stop Vovk and his french Defence.>

Prophetic words: Wei Yi vs Y Vovk, 2015

Nov-26-16  YouRang: Saturday 26...?


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I went with the mundane but effective <26...Bxc2>.


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I get a pawn, and white practically has to take with the queen to avoid nasty tactics (e.g. 26...Kd2? 27.Bf5 threatens both ...Bxh3 and ...Rc2+ skewering Q).

So if <26...Qxc2 27.Rxc2 Kxc2>


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How best for black to continue? White's Be5 is causing the greatest problems by blocking my (black) central pawns and guarding that Pg7 that has paralyzed by king. Hence, I don't feel bad to spend a rook to exchange it: <28...Rc7+ 29.Bxc7 Qxc7 30.Kb1 Qxf4>


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Now white needs a rook to guard Pg7, and I would be happy with my chances with two connected passers and a fairly exposed white king.

In other words, 26...Qg5 never occurred to me.

Nov-26-16
Premium Chessgames Member
  scormus: <YouRang .... In other words, 26...Qg5 never occurred to me>

It didn't occur to me either. It looks such an unobvious move. In fact I went though the same thought processes as you with 26 ... Bxc2. I'm sure it's what I would play in a game but for today's puzzle I had a feeling it wasn't quite adequate.

Nov-26-16  wrap99: What is wrong with Rxc2?
Nov-26-16  paavoh: Followed the footsteps explained by <YouRang>
Nov-26-16  TheBish: Never even considered 26...Qg5!! This is what I would call Insane. Why is this not a Sunday puzzle? I was trying to make moves like 26...b3 and 26...Qa5 work. I bet Sunday's is easier.
Nov-26-16  morfishine: Silly me, in my hasty review, I thought White's rooks were doubled lol

*****

Nov-26-16  RKnight: Joining the chorus, I also never even considered 26...Qg5. It takes a grandmaster or dose of insanity to think like that.

But I did come up with a likely winning line different from <YouRang>'s: 26...d4, 27. Rd1 Qd5, 28. Qe2 Qxa2 (if 28. Kb1 Qxe5), and White cannot stop 29...Rfc2 or b6.

It would be interesting to see which line an engine likes best, or whether all three work: this one, YouRang's and the game.

Nov-26-16  lost in space: I also went for ...Bxc2
Nov-26-16  bubuli55: I agree. That's very difficult.
Nov-26-16  YouRang: <wrap99: What is wrong with Rxc2?>

Nothing. It probably amounts to the same as 26...Bxc2.

The difference? ...Rxc2+ forces white to capture with the queen, whereas ...Bxc2 gives white the option to blunder by not capturing with the queen.

Nov-26-16
Premium Chessgames Member
  Jimfromprovidence: <YouRang> <Now white needs a rook to guard Pg7, and I would be happy with my chances with two connected passers and a fairly exposed white king>.


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Just a note. In your final diagram white will lose the g pawn because he has to play Ka1 first to avoid ...Qf5+.

Nov-26-16  King.Arthur.Brazil: I must agree with everybody, because I didn't even think about Qg5, but seems sound as soon as I realize that fxg5 Rxg5 and white position's become verybad and the threat of Qxe5 paralises the R of h3. Very hard to see that move, sure! As I didn't found the start, I didn't go on the solution furhter... Not in a good days! :-(
Nov-26-16  YouRang: <RKnight: Joining the chorus, I also never even considered 26...Qg5. It takes a grandmaster or dose of insanity to think like that.

But I did come up with a likely winning line different from <YouRang>'s: 26...d4, 27. Rd1 Qd5, 28. Qe2 Qxa2 (if 28. Kb1 Qxe5), and White cannot stop 29...Rfc2 or b6.

It would be interesting to see which line an engine likes best, or whether all three work: this one, YouRang's and the game.>

I like your 26...d4, threatening both ...d3 and ...Qd5!, which forks Rh1 and Be5 (Be5 isn't really protected by the pinned Pf4). It's a bit more complicated though, since it's harder to predict white's reply. Will it be Rd1? Or maybe Rg3 or Rg1?

At low ply, my engine prefers 27.Rg1 for white, e.g. 27...d3 28.Rxg6 Rxc2+ 29.Qxc2 dxc2 30.Rg1


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Going back to move 26 and letting the engine work on black's options, it seems to have a number of good choices, although shifting ideas about which one is best. At 30 ply, I have:

Stockfish_16090917_x64_modern @ 30 ply:
-2.54 26...Qa5 27.Kb1 Rxc2 28.Qxc2 Bxc2+
-2.39 26...Qg5 27.Re3 Bxc2 28.Kd2 Be4 29.Rxe4
-1.74 26...d4 27.Rg1 d3 28.Rxg6 Rxc2+ 29.Qxc2
-1.52 26...Rd7 27.Rg1 Rxc2+ 28.Qxc2 Bxc2
-1.52 26...Bf5 27.Rb3 Qa5 28.Rd1 Qa4 29.Kb1

So, my 26...Bxc2 isn't even in the top 5. Of course, humans attach more value to simplicity than engines do. If I plug in the resultant position that I reached after 30...Qxf4 and let it work to 30 ply, the engine comes up with this:


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Stockfish_16090917_x64_modern @ 30 ply:
-2.61 31.Rd1 Kxg7 32.Rhd3 Qxh2 33.Re1 Qf2
-2.66 31.Ka1 Kxg7 32.Rg1+ Kf6 33.Rxh7 e5
-2.77 31.Rd3 Kxg7 32.Rg1+ Kf6 33.Rgd1 Qxh2

In other words, 26...Bxc2 is really no worse than the other options, but IMO it leads to a simpler position that makes it easier for a human to win (if playing black) or to resign (if playing white).

Nov-26-16  YouRang: <Jimfromprovidence><Just a note. In your final diagram white will lose the g pawn because he has to play Ka1 first to avoid ...Qf5+.>

Yes, I noticed that just a moment ago when I let the engine work on the final position. In my quick assessment of the position, I overlooked black's forking tactics ...Qf5+ or ...Qe4+.

To be honest, it wasn't even obvious to me that black was in any hurry to take Pg7 since it shields the king from checks. However the engine does insist, e.g. if I start pushing pawns: 31.Ka1 d4? 30.Rg3 e4 31.Rg1


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After 31...d4, black has nothing better than a draw, and will in fact lose if he doesn't find 33...Qf5 here.

I think I would have taken the pawn just to avoid complications, but one mustn't underestimate the strength of two rooks.

BTW, besides 31.Ka1, white also has 31.Rd1 Qf5+ 32.Rhd3, but 31.Ka1 makes a bit more sense I think.

Nov-26-16  AlicesKnight: With <YouRang> et al ......
Nov-26-16
Premium Chessgames Member
  patzer2: Not realizing it was Black to move, I picked 26. Rg1 for today's Saturday puzzle, which would be a best move if it were White to move in our puzzle position.

Since it's actually Black to move (26...?) for today's puzzle, the game continuation 26...Qg5 (-2.37 @ 28 depth, Stockfish 040916), which threatens 26...Qxe4 , is best.

P.S.: For a White improvement, I prefer to ditch 11. Nb3 = in favor of 11. Qf2 as in White's win in Wei Yi vs Y Vovk, 2015.

Nov-26-16  peristilo: My first intention was to play 26... Qa5 and keep the same threats alive in a better version of the position but I thought Rxc2 would give black an immediate advantage.
Nov-26-16
Premium Chessgames Member
  drollere: i went with 26. ... Rxc2+, 27. Qxc2 Bxc2, 28. Kxc2 with h5 or Qa4 to follow.
Nov-26-16  morfishine: So, lots of stuff wins, even if White's rooks are not doubled LOL

*****

Nov-26-16  R4f43l L3 M4550n: My think process is too slowly. I spended about half an hour on today puzzle and concluded that Black is in good shape here :

Black King is relatively safe if compared with the White King due to white pawns at h2 and g7 squares blocking attacks from the lines. At the first glance the black castle is ruined but in short therms there is no threat. The Bishop and h7 pawn are very well defenders.

White Rook is misplaced in the h1 square. So I think black is up a tempo.

White King is exposed to imminent attack in c line.

So I found 3 good candidates, 26... Rxc2, 26... Bxc2 and 26... Qa5. As some others, I did not realized the finesse 26... Qg5!.

I consider Rxc2 and Bxc2 relatively equal. So I picked up the 26... Qa5, with attack...

Nov-26-16
Premium Chessgames Member
  agb2002: A busy day. I think I'd play 26... d4 with several ideas, Rxc2+, d3, Qd5, Rd7, etc.
Nov-26-16  The Kings Domain: And I was thinking of all sorts of complications like 26)...Rxg7. Nice puzzle and a good game.
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