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Ivan Cheparinov vs David Navara
"Bargaining Chep" (game of the day May-13-2008)
European Team Chess Championship (2007), Crete GRE, rd 5, Nov-01
Spanish Game: Closed Variations (C84)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Mar-03-17  scholes: Stockfish says 31 h4 would have drawn
Mar-03-17  mel gibson: This is nonsense -
the computer is giving little more than a pawn advantage to black but agrees with the first 5 plies:

27. Bxf7 Qxf2+ (27. .. Qxf2+ (♕d4xf2+ ♔g1xf2 ♖e8-e2+ ♔f2-g1 ♖e2xd2 ♖a1-e1 g7-g6 ♖e1-e6 ♖d2xg2+ ♔g1-f1 ♖g2-g3 ♕f5-b5 ♖g3-f3+ ♔f1-e1 ♘f4-g2+ ♔e1-d1 ♖f3-f1+ ♔d1-e2 ♖f1xf7 ♖e6xd6 ♗b7-f3+ ♔e2-d2 ♖f7-e7 c2-c3 ♖e7-e2+ ♔d2-c1 b4-b3 c3-c4 c7xd6 ♕b5-b8 ♘g2-e1) +1.56/19 124)

score +1.56 depth 19.

Mar-03-17
Premium Chessgames Member
  wtpy: This was much easier than yesterday's to me because it is more of a typical pattern. Good find on h4 but even if Qf2 only draws, I think it is still black's best move in position.
Mar-03-17  JTV: Ivan Cheparinov blew the chance of perpetual check on move 31. Should have played 31.h4. Then all Black can do is 31...Bg2+ 32.Ke1 Re2+ 33.Kd1 and now there is nothing black can do to stop perpetual check...
Mar-03-17  The Kings Domain: Another miss in failing to see the follow-up to the text move. Striking victory by Navara.
Mar-03-17
Premium Chessgames Member
  gofer: <Abdel Irada:> Thanks! I was blind, but now I can see...
Mar-03-17
Premium Chessgames Member
  Jimfromprovidence: If white does somehow find 31 h4, black has 31... g6.


click for larger view

White to play and win.

Mar-03-17  goodevans: 27...Qxf2+ is very nice but I got side-tracked into looking at <27...Be4 28.dxe4 Qxe2 29.Bxe8 Ne2+ followed by 30...Ng3+>. Still can't quite see what's wrong with that.
Mar-03-17
Premium Chessgames Member
  YouRang: Friday 27...?


click for larger view

Let's see: White threatens mate (Qg6# or Qxh5#). Note that the Nf4 appears to be guarding those squares, but it's an illusion because it's pinned by Bd2.

Black could unpin the N with 27...g5, but then black merely removes the N with 28.Bxf4.

It seems that black has no choice but to go on the attack, and the only interesting try in that regard is the queen sac <27...Qxf2+! 28.Kxf2>


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Black needs to follow up with <28...Rf2+>, forking K and Bd2, hence <29.Kg1 Rxd2>


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With Bd2 eliminated, black's Nf4's defense against mate is solid. Furthermore, it is black with the initiative with the king under fire from the rook, the Nf4 and both bishops. Black looks better.

Mar-03-17
Premium Chessgames Member
  YouRang: <goodevans: 27...Qxf2+ is very nice but I got side-tracked into looking at <27...Be4 28.dxe4 Qxe2 29.Bxe8 Ne2+ followed by 30...Ng3+>. Still can't quite see what's wrong with that.>

27...Be4 28.Qxh5#

Mar-03-17
Premium Chessgames Member
  Marmot PFL: Found this combination in about 5 minutes, good for a Friday when often I don't find them at all. Mostly spent on move 30, finally deciding that Rxd2 was "good enough". Still I don't see a forced win past that, just a strong attack
Mar-03-17
Premium Chessgames Member
  YouRang: Interesting: I didn't consider the game line of black's 29th move:


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Here, black played 29...Rxg2+, whereas I just took the bishop: 29...Rxd2.

Plugging into the computer, it appears that <29...Rxd2> is better, I believe because leaving the K at g1 exposes it to a knight check.


click for larger view

In particular, black threatens ...Nf2+ forcing Kf1 or Kh1 (Kf2? ...Nd4+ ), and then Ng3+, forking K+Q.

Mar-03-17  JTV: I think the queen sacrifice was a great move, but black blundered with 29...Rxg2. Needed to play 29...Rxd2 instead, forcing white to play 30.Re1 to stop the Knight from wreacking havoc...
Mar-03-17  LIzzard: Little easy for a Friday - the desperaiton moves kind of get you there...
Mar-03-17
Premium Chessgames Member
  Marmot PFL: I think the point of playing 29...Rxg2+ was to force 30 Kf1 so that after 30...Rxd2 black threatens Bg2+.

If first 29...Rxd2 than 30 Re1 threatens Re6+ and if 30...Rxg2+ 31 Kf1. Possibly this is better for black but I think it's complicated enough that black chooses to take with check right away to rule it out.

Mar-03-17
Premium Chessgames Member
  RandomVisitor: After 31.h4! the best that black can do is two drawing lines:


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Komodo-10.1-64bit:

0.00/38 31...Rh2 32.Bg8 Rh1+ 33.Kf2 Rh2+ 34.Kf1

0.00/38 31...Bg2+ 32.Ke1 Re2+ 33.Kd1 Bf3 34.Qg5+ Kh7 35.Qf5+ Kh8 36.Kc1 Re1+ 37.Kd2 Re2+ 38.Kc1

so it is better to play: 29...Rxd2, where the winning line is hard to find against 30.Re1


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Komodo-10.1-64bit:

-1.79/26 30.Re1 g6 31.Re6 Rxg2+ 32.Kf1 <Rg3> 33.Qb5 Rf3+ 34.Ke1 Ng2+ 35.Kd1 Rf1+ 36.Ke2 Rxf7 37.Rxd6 Bf3+ 38.Kd2 Re7 39.Rxg6+ Kxg6 40.c3 Nf4 41.h4 Re2+ 42.Kc1 Re5 43.Qb8 Kf5 44.Kc2 Re2+ 45.Kb3 c5 46.Qd8 Ne6 47.Qxa5 Bd5+ 48.c4 Bf3 49.Qb6 Re3 50.Ka2 Bd1 51.Qd6 Bxa4 52.Qa6 b3+ 53.Ka3

-3.01/26 30.g4 Ne2+ 31.Kf1 Ng3+ 32.Ke1 Re2+ 33.Kd1 Nxf5 34.Kxe2 Nd4+ 35.Kf2 hxg4 36.hxg4 Nxc2 37.Rc1 Nd4 38.Ke3 c5 39.Bc4 Kg5 40.Rf1 g6 41.Rf7 Bc6 42.Ra7 Kxg4 43.Kf2 Bxa4 44.Rxa5 Bc6 45.Ra6 Bh2 46.Ke3 Bf4+ 47.Kf2 Bd6 48.Ra5 g5 49.Ra7

Mar-03-17  NBZ: <RandomVisitor> 31. h4 is hard to find though, is it not? Even after Black's 30th move, with the position staring at you, it is not obvious why White should play it rather than the game move Bh7. To able to foresee 31. h4 on the 29th move, and as such play 29. ... Rxd2 instead of 29. ... Bxg2+: I think this may be beyond human capability in OTB play.
Mar-03-17  benveniste: <Jimfromprovidence>After 31. h4 g6 it goes
32. ♗xg6 ♖b2 (Forced, methinks).
33. ♕b5

Once the smoke clears, white ends up with a Queen and a pawn for a bishop and a knight.

Mar-03-17
Premium Chessgames Member
  Jimfromprovidence: <benveniste><After 31. h4 g6 it goes 32. Bxg6 Rg2 (Forced, methinks).
33. Qb5

Once the smoke clears, white ends up with a Queen and a pawn for a bishop and a knight.>

Yes, that's what I found as well.

After 32 Bxg6 black cannot play 32...Nxg6 because 33 Qg5+, below, wins the rook.


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Also, after 32....Rg2 (to prevent 33 Qg5+) 33 Qb5 keeps the advantage.


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Black now has no checking moves to gain a tempo, so he either has to move his white bishop to safety (allowing white to do the same with his bishop) or trade bishops.

Mar-03-17
Premium Chessgames Member
  RandomVisitor: <NBZ>Yes, 31.h4 is a hard find <I think this may be beyond human capability in OTB play.>well said.
Mar-03-17
Premium Chessgames Member
  Carlos0012358: 31.Bg8 is a wasted and useless move that leads to white's demise. The game was even and should have ended in a draw.
Mar-03-17
Premium Chessgames Member
  YouRang: FWIW, I've been sliding deeper into the variation:

<27...Qxf2+! 28.Kxf2 28...Rf2+ 29.Kg1 <Rxd2>> (instead of 29...Rxg2+, as played)


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According to the engine, best play continues as follows:

<29...Rxd2 30.Re1 g6 31.Re6 Rxg2+ 32.Kf1 Rg3 33.Qb5 Rf3+ 34.Ke1 Ng2+ 35.Ke2 Rxf7 36.Rxd6 cxd6>


click for larger view

Stockfish_16090806_x64_modern @ 40 ply:
-3.33 37.Qxa5 Bc8 38.Qxb4 Nf4+ 39.Kd2 Bxh3 40.a5 h4
-3.76 37.Qe8 Kg7 38.Kd1 Nf4 39.h4 g5 40.Qd8 gxh4

Mar-03-17
Premium Chessgames Member
  morfishine: Engines always win :(

*****

Mar-03-17
Premium Chessgames Member
  RandomVisitor: A final look after 29...Rxd2! is it enough to win?


click for larger view

Komodo-10.1-64bit:

-1.78/40 30.Re1 g6 31.Re6 Rxg2+ 32.Kf1 Rg3 33.Qb5 Rf3+ 34.Ke1 Ng2+ 35.Kd1 Rf1+ 36.Ke2 Rxf7 37.Rxd6 Bf3+ 38.Kd2 Re7 39.c3 cxd6 40.Qb8 Re2+ 41.Kc1 Re1+ 42.Kc2 Ne3+ 43.Kb3 Bd1+ 44.Ka2 b3+ 45.Ka3 Nf5 46.c4 Bc2 47.Qh8+ Kg5 48.Qd8+ Re7 49.Qxa5 Bxd3 50.Kxb3 Re3 51.Kb4 Rxh3 52.Qd8+ Kf4 53.a5 Be4 54.a6 Rh2 55.a7 Rxb2+ 56.Ka3 Rb1 57.Ka2 Rf1 58.a8Q Rf2+ 59.Kb3 Bxa8 60.Qxa8 h4 61.Qa7

-3.96/40 30.g4 Ne2+ 31.Kf1 Ng3+ 32.Ke1 Re2+ 33.Kd1 Nxf5 34.Kxe2 Nd4+ 35.Kf2 h4 36.g5+ Kxg5 37.c3 Bg3+ 38.Kf1 Kf6 39.Bh5 Nb3 40.Rd1 bxc3 41.bxc3 Bc6 42.Bg4 Bxa4 43.Kg1 Bc6 44.Rf1+ Ke7 45.Rb1 a4 46.Bd1 Nc5 47.Bc2 Bf4 48.Kf1 Bd2 49.d4 Ne4 50.Bxe4 Bxe4 51.Ra1 Bxc3 52.Rxa4 Bc6 53.Ra7 Kd6 54.Ke2 Bxd4 55.Ra6 Kd5 56.Ra5+ Kc4 57.Rf5 Bg2 58.Rf4 g5 59.Rg4 Bxh3 60.Rxg5 Bd7 61.Kf3

Mar-04-17
Premium Chessgames Member
  RandomVisitor: White missed 19.Qg4!


click for larger view

Komodo-10.1-64bit:

<+0.96/29 19...Rxe5 20.Qxd4 Rae8 21.Rxe5 Qxe5 22.Qxe5 Rxe5> 23.Ne4 Nb6 24.f3 Bc6 25.d4 Re8 26.Bb3 Bd5 27.Bxd5 Nxd5 28.Re1 Rd8 29.c3 f6 30.Kf2 Kf7 31.g4 b3 32.Ra1 c6 33.Ke2 Nb6 34.Kd3 c5 35.Be3 Be7 36.Ke2

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