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Ronald Kempter vs Ulf Andersson
Bad Wiessee (2008), rd 4, Nov-04
Zukertort Opening: Sicilian Invitation (A04)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Jan-23-19
Premium Chessgames Member
  Dionysius1: Is 36... ♔h7 essential to the solution? I got the rest of it.
Jan-23-19  Walter Glattke: 37.Qc1 Qxd3+ 38.Kg1 Rxb8 39.Rxb8 Qf5 40.Qb1 Qxb1 41.Rxb1 c4 42.Kf1 d3 black wins. / 33.-Bh3+ 34.Kg1 Rxe2? 35.Bxe2 Qd5 36.f3!
Jan-23-19  ChessHigherCat: I couldn't find anything at all for about 5 minutes then I finally stumbled onto this, which seems promising although I haven't worked out all the gory details:

33...Rxe2 34. Bxe2 Bxe2 35. f4 Bxd3 36. Rb8

Jan-23-19  ChessHigherCat: <Dionysius1: Is 36... ♔h7 essential to the solution? I got the rest of it.>

No, in fact 36...Qh3+ immediately is stronger according to FishStick.

Jan-23-19
Premium Chessgames Member
  al wazir: I got 33...Rxe2 34. Bxe2 Rxe2, with 35...Bf3+ and an eventual ...Qh3 to follow. What else is there?

The purpose of 35. Rb8 was to keep black from playing ...Rf8. But I don't understand the purpose of white's 36. R1b2. I think 36. Qb3 would have made more sense. Then 36...Rxb8 is answered by 37. Qxb8 , and white keeps a ♖ on the first rank, preventing black's mate 39...Qd1#.

Jan-23-19  ChessHigherCat: <Al Wazir: But I don't understand the purpose of white's 36. R1b2.>

He must have been worried about the threat of 37. Rxc8 Qh3+ 38. Ke1 Qh1+ 39. Kd2 Qxb1 and now black is threatening mate in 1

Jan-23-19
Premium Chessgames Member
  al wazir: <ChessHigherCat: He must have been worried about the threat of 37. Rxc8 Qh3+ 38. Ke1 Qh1+ 39. Kd2 Qxb1 and now black is threatening mate in 1>>

Well, 36. Qb3 defends against that too.

Jan-23-19  ChessHigherCat: That's my guess. Why else would he play it?
Jan-23-19  breakbad: Is it Monday already?
Jan-23-19  saturn2: I went with the first two moves. Black has B+2P for R which is advantagous. But there are many options to ckeck. For example in the game line

37. Rxc8 Qxc8 38. Qc1 Qh3+ 39. Ke1 Qh1+ 40. Kd2 Qg2 41. Qe1

Jan-23-19
Premium Chessgames Member
  cocker: Black missed 36 … Qh3+, White missed 37 Rxc8.
Jan-23-19
Premium Chessgames Member
  agb2002: Black has an extra pawn.

The pawn on e2 protects the white bishop. This suggests 33... Rxe2 34.Bxe2 (34.Bxg4 Qxf2+ 35.Kh1(3) Qh2#) 34... Bxe2:

A) 35.Rb8 Bf3+

A.1) 36.Kf1 Qh3+ 37.Ke1 (37.Kg1 Qh1#) 37... Rxb8 38.Rxb8+ Kh7

A.1.a) 39.Qc1 Qe2+ 40.Kg1 Qe5

A.1.a.i) 41.Qf4 Qe1+ 42.Kh2 Qh1#.

A.1.a.ii) 41.Qb1 Qh5 and mate soon.

A.1.a.iii) 41.Rb5 Qh5 and mate soon.

A.1.a.iv) 41.Kf1 Qxb8 wins decisive material.

A.1.b) 39.Rb1 Qh3+ 40.Ke1 Qh1+ 41.Kd2 Qxb1 wins.

A.1.c) 39.Qb2 Qh3+ 40.Ke1 Qh1+ 41.Kd2 Qd1#.

A.2) 36.Kg1 Qh3 37.Rxc8+ Kh7 38.Rh8+ Kxh8 39.Rb8+ (39.Qa8+ Bxa8 and White's f-pawn avoids the stalemate) 39... Kh7 40.Rh8+ Kxh8 wins.

A.3) 36.Kh2 Qh4+ 37.Kg1 Qh1#.

B) 35.Rh1 Bf3+ 36.Kg1 Bxh1 37.Kxh1 Re8, with many threats Re1+, Re2, Qxf2, Qf3+ followed by Re5, looks winning.

C) 35.Rg1 Bf3+ 36.Kf1 Re8 37.g4 Be2+ 38.Ke1 (38.Kg2 Qxg4+ 39.Kh2 Qh4+ 40.Kg2 Re6 wins) 38... Bxg4+ 39.Kf1 (39.Kd2 Qxf2+ wins) 39... Bh3+ 40.Rg2 Qh3 wins.

D) 35.Rf1 Bf3+ 36.Kg1 Qh3 wins.

E) 35.Re1 Bf3+ and mate in three.

Jan-23-19  Walter Glattke: Al Wazir: "Threatening mate in 1", but also 40.Qc1 Qb4+ 41.Qc3 Qxc3# is mate. Or you play 40.Rh8+ Kxh8 41.Qa8+ Kh7 42.Qe4+ g6 43.Qe1 Qb4+ 44.Kc1 Qxe1+ will be mate anyway.
Jan-23-19
Premium Chessgames Member
  TheaN: Wednesday 23 January 2019

<33....?>

I desperately wanted to get this to mate, but I guess that after defenses like 35.f4 or 35.Rh1 Black will have to accept the two pawn advantage which is killing in the position that follows.

<33....Rxe2> breaks it all open. White can't decline this sacrifice as Black's threatening Qxf3, and if the Bishop moves anywhere but e2, Qxf2+ with mate follows.

<34.Bxe2 Bxe2> and Black's calling all the shots. The threat is Bf3+ with Qh3, which not too many moves defend against.

A) <35.anything but the below moves Bf3+ 36.Kf1 (Kg1/Kh2 with Qh3/Qh5+ mate) Qh3+ 37.Ke1 Re8+ 38.Kd2 Re2+ 39.Kc1 Qf1#>

B) <35.Rg1 Bf3+ 36.Kf1 (Kh2 Qh5+ with mate) Re8!> and White can't prevent mate.

C) <35.Rxc5 Bf3+ 36.Kh2 (Kf1/Kg1 follows main variation) Rxc5 -+> and White can't prevent Qh5.

D) <35.Rh1 Bf3+ 36.Kg1 (Kf1 same but a full Rook) Bxh1 37.Kxh1 Qxf2 -+> is lost, White hasn't improved his position at all and is still facing all kinds of threats.

E) <35.Rb8 Bf3+ 36.Kf1 Qh3+ 37.Ke1 Qe6+!> will keep the White King boxed in. This subtle move I did miss, but apparently so did Andersson :>. <38.Kf1 (Kd2 Qe2+ 39.Kc1 Qd1+ 40.Kb2 Rxb8+ 41.Qb4 Rxb4+ 42.Ka3 Qa4#) Rxb8! 39.Rxb8+ Kh7 40.Qc1 Qe5 -+> and White can't escape the net.

Jan-23-19
Premium Chessgames Member
  TheaN: Obviously the last variation had to be 40....Qe2+ 41.Kg1 Qe5 -+, where Black threatens Qxb8 and Qh5. If 40.Rb1, 40....Qh3+ 41.Ke1 Qh1+ -+ will pick up the Rook as well.
Jan-23-19
Premium Chessgames Member
  Breunor: It looks like white can save the game until move 32 where he played Rcb1.

1) -0.59 (24 ply) 32.Kg1 Bg4 33.Bxg4 Qxg4 34.Rbxc5 Rcxc5 35.Rxc5 Qxe2 36.Rxe5 Qxe5 37.Qa8+ Kh7 38.Qc6 g5 39.Kg2 h5 40.Qf3 Kg6 41.Qa8 Qf6 42.Qe4+ Kg7 43.Qd5 h4 44.gxh4 gxh4 45.Qf3 Qe6 46.Qf4

2) -0.88 (23 ply) 32.Ra5 Bg4 33.Kg2 h5 34.Ra8 Bxf3+ 35.exf3 g6 36.Rxc8+ Qxc8 37.f4 Qc6+ 38.Kh3 Rf5 39.Ra1 Rf6 40.Qa8+ Kg7 41.Qxc6 Rxc6 42.Kg2 Kf6 43.Kf3 Ke6 44.Ra5 Kd5 45.Ke2 Rb6 46.Ra7 f5 47.Rd7+ Kc6 48.Rg7 Rb2+ 49.Kf3

But after Rcb1:

1) -3.29 (23 ply) 32...Bg4 33.Kg2 Rxe2 34.Bxe2 Bxe2 35.Rb8 Bf3+ 36.Kf1 Qh3+ 37.Ke1 Qe6+ 38.Kf1 Rxb8 39.Rxb8+ Kh7 40.Qc1 Qe2+ 41.Kg1 Qxd3 42.Kh2 c4 43.Qf4 f5 44.Qe5 Qe4 45.Qxe4 Bxe4 46.Rb4 Bd5 47.g4 fxg4 48.Kg3

What is the difference? I'm not sure, I think that once white plays Rcb1 he isn't poised to take control of the 5th rank with the threat or Rxc5. By moving the rook to b1, where the c5 pawn isn't threatened, black is not 'free' to move an attacker from the defense on c5.

Jan-23-19
Premium Chessgames Member
  Whitehat1963: R1b2?? What a colossal blunder!
Jan-23-19  mel gibson: Good one.
I saw the first few moves but it's a long way
from a checkmate.

Stockfish 10 says mate in 25:

33... Rxe2

(33. .. Rxe2 (♖e5xe2 ♗f3xe2 ♗g4xe2 ♖b5-b8
♗e2-f3+ ♔g2-f1 ♕f5-h3+ ♔f1-e1 ♕h3-e6+ ♔e1-f1 ♖c8xb8 ♖b1xb8+ ♔g8-h7 ♕a3-c1 ♕e6-e2+ ♔f1-g1 ♕e2-e5 g3-g4 ♕e5xb8 ♕c1xc5 ♕b8-b1+ ♔g1-h2 ♕b1-h1+ ♔h2-g3 ♕h1-g2+ ♔g3-f4 ♕g2xg4+ ♔f4-e5 ♕g4-h4 ♕c5-d6 ♕h4-h2+ ♔e5xd4 ♕h2xd6+ ♔d4-c4 ♗f3-e2 f2-f3 ♕d6xd3+ ♔c4-c5 ♗e2xf3 ♔c5-b4 ♕d3-d4+ ♔b4-b5 ♔h7-g8 ♔b5-a5 ♗f3-c6 ♔a5-a6 ♕d4-b4 ♔a6-a7 ♕b4-b7+) +M25/69 )

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