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Radoslaw Wojtaszek vs Pentala Harikrishna
Biel (2014), Biel SUI, rd 9, Jul-23
Gruenfeld Defense: Exchange Variation (D85)  ·  1-0
ANALYSIS [x]

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Kibitzer's Corner
Jul-23-14  1971: What a crush
Jul-23-14  kia0708: wow, cool play by Wojtaszek
Jul-23-14  MountainMatt: Every time I see the Grunfeld, I grow a bit more incredulous as to why one would want to play it. Does black really get anything out of it? It seems like white just gets a super-strong position handed to him after 10 moves and from there "all" he has to do is not blunder (easier said than done!). That's just how it looks to me.
Jul-24-14  1d410: The opening hands white the center, which white cleverly exploited this game.
Jul-24-14  shintaro go: Is harikrishna a grunfeld player? Doesnt seem he knew how to handle it.
Jul-25-14  Ulhumbrus: 13 e5?! may be too optimistic.

Instead of 13...Qd7 13...g5 undermines White's centre without delay eg 14 Bg3 f5.

Instead of 18...Be4 18...f6 undermines the e5 pawn without delay

Jul-28-14
Premium Chessgames Member
  mike1: Ulhumbrus, in yoyr line with 13....g5,
what do you intend to play after 14.Nxg5? Bxe2 15.Qxe2 Qxd5 16.Qc2 is not convincing
Jul-28-14  Ulhumbrus: <mike1: Ulhumbrus, in yoyr line with 13....g5, what do you intend to play after 14.Nxg5? Bxe2 15.Qxe2 Qxd5 16.Qc2 is not convincing> This could be the reason why Harikrishna did not choose 13...g5. In that case how about 13...f6
Oct-23-15
Premium Chessgames Member
  Penguincw: Alright, I got the first few plies: 36.Bxc6 Qxc6 37.Rxe6. Good enough for me on a Friday puzzle. :)
Oct-23-15  stst: Divert the Q first
36.BxN QxB
37.Rxe6 fxe6
38.f7 dis+ Rg7
39.Qf6 ...*

*IF
(A) Rxd6 40.f8=Q#
(B) Qxd6 40.RxQ
(C) Rf8 40. d7

Oct-23-15
Premium Chessgames Member
  al wazir: I admit I didn't see 37...Rgf8, but I would have continued 38. Qe5, as Wozzeck did in the game.
Oct-23-15
Premium Chessgames Member
  patzer2: The combination <36. Bxc6 Qxc6 37. Rxe6 Rgf8> solves today's Friday puzzle, since 37... fxe6 38. f7+ Rg7 39. d7 h5 40. Qf6 Qa8 41. Qe7 Rxf7 42. Qxf7 Qb8 43. Qxe6 hxg4 44. Qf6+ Kh7 45. Rd6 is decisive as Deep Fritz 14 @ 23 depth announces mate-in-20.

For a Black improvement, I prefer the popular move 7...c6 as in D Naroditsky vs Robson, 2015.

Oct-23-15
Premium Chessgames Member
  agb2002: White has a bishop for a knight.

Black threatens Nd4 and Rxd6 or Nf3+.

The queen x-rays the black king. These details suggest 36.Bxc6 Qxc6 37.Rxe6:

A) 37... fxe6 38.f7+ Rg7 39.Qf6

A.1) 39... Rf8 40.d7 Qa8 41.d8=Q wins.

A.2) 39... Qa8 40.d7 looks winning. For example, 40... h6 41.f8=Q+ Rxf8 42.d8=Q wins.

A.3) 39... Qc8 40.d7 as in A.2 (40... Rxd7 41.Rxd7 Qxd7 42.f8=Q(R)#).

A.4) 39... Rxd6 40.f8=Q(R)#.

B) 37... Rge8 38.Re7 wins a pawn with an overwhelming position (38... Rxd6 39.Rxd6 Qxd6 40.Rxe8+ Qf8 41.Rxf8#).

C) 37... Rgf8 38.Re7 Rxd6 39.Rxd6 Qxd6 40.Rxa7 with a similar conclusion as in B.

Oct-23-15
Premium Chessgames Member
  morfishine: <36.Bxc6> forces 36...Qxc6 but then Black is hit with <37.Rxe6>

*****

Oct-23-15  M.Hassan: "Difficult"
White to play 36.?
Equal but White has a bishop for a Knight.

36.Rxe6 fxe6
37.Bxc6 Qxc6
38.f7+ Rg7(forced)
39.d7

A) 39........Rxd7
40.f8=Q#
B) 39........Qxd7
40.Rxd7 Rf8
41.Qf6 Rfxf7
42.Rxf7 and mate next move.
C) 39..........Qc7
40.Qf6 Rf8
41.d8=Q Rxd8
42.Rxd8+ Qxd8
43.Qxd8+ Rg8
44.Qxg8#
C.1)
41.d8=Q2 Qxf7
42.Q2xf8+ Qxf8
43.qxf8+ Rg8
44.Qf7
And White will be winning

Oct-23-15
Premium Chessgames Member
  agb2002: I missed the defense A.5) 39... Qd7 40.f8=Q+ Rxf8 41.Qxf8+ Rg8 42.Qf6+ Rg7, although according to Stockfish 43.Re2, intending Rxe6 and Re8+, wins.

Also 38.Re7, after 37... Rgf8, is not near as strong as it is after 37... Rge8 and loses most of the advantage compared with 38.Qe5, controlling everything and preparing Re7 under better conditions.

Oct-23-15  Caissas Clown: saw the Rxe6 idea easily enough,but realised that it could not be played at once due to Nd4. So I went for 36.Qf3 , anticipating 36.. Rc8 to defend the N and following up with 37.d7.

Yet I overlooked(instead of 36..Rc8) 36..Na5. After 37. Qxb7 ..Nxb7,it still seems good for White,despite the LSB not controlling the queening square.

I'm sure the 2700 GM looked at that - and even surer that his solution was far better than mine !

Oct-23-15
Premium Chessgames Member
  patzer2: If 37...fxe6, play might continue 38. f7+ Rg7 39. d7 h5 40.Qf6 Qa8 41. Qe7 Kh7 (diagram below)


click for larger view

when the amusing 42. Qe8! (diagram below)


click for larger view

wins due to the threat 43. f8(Q) .

Oct-23-15
Premium Chessgames Member
  patzer2: In the final position, Black resigns in lieu of 41. Qh6 Rg8 42. Re8 with mate-in-two to follow.

Instead of 40...Rg7, Black could have prolonged the end a bit with 40...g5 when play might continue 41. Qxg5 Rg8 42. Qh5 Qf3 43. Rxf7 Qe4 (diagram below)


click for larger view

when White wins with 44. Re2! (diagram below)


click for larger view

as play might continue 44...Qg6 45. Qxg6 hxg6 46. Ree7 with mate-in-four to follow.

Oct-23-15
Premium Chessgames Member
  kevin86: White enter with a vengeance with the rook!
Oct-23-15  Marmot PFL: Thought is was fairly easy, giving up the rook to set up the discovered check and advance the passed pawns. The knight is a defender so 36 Bxc6 Qxc6 37 Rxe6 fe6 38 f7+ Rg7 39 d7 followed by f8(Q) and d8(Q).
Oct-23-15  Rookiepawn:


click for larger view

I arrived here successfully but then I went 39 d7 Qxh3 40 Qe4 ... I guess it wins too since the BQ is not very effective there.

Oct-24-15
Premium Chessgames Member
  CHESSTTCAMPS: White has a bishop for a knight, with mobile major pieces and a protected passed pawn on d6, while the black rooks perform defensive duty on the back rank. A key tactical feature is the lineup of Qc3 and kh8, making 36.Rxe6 a strong candidate. Another move to consider is the pin 36.Qf3, but after 36... Na5, it is not clear how white improves the position. After 36.Rxe6 Nd4 looks troublesome for white. Therefore, the knight should be eliminated first,

36.Bxc6! Qxc6 37.Rxe6! crashes through the defenses:

A.37...fxe6 38.d7! (f7+ Rg7 39.Qf6 Qd7 appears to hold) Rxd7 39.f7+ Rd4 (Rg7 40.f8=Q#) 40.Rxd4 cxd4 41.Qxd4+ Rg7 42.f8=Q#

A.1 38... Qa8 39.f7+ Rg7 40.Qf6 h5 41.Qe7 Kh7 42.Qe8 Rxf7 (otherwise 43.f8=Q) 43.Qxf7+ Kh6 (Kh8 44.Re2 wins) 44.Qxe6 and the d7-pawn decides.

A.2 38... Rf8 39.d8=Q forces mate soon.

B. 38... other (e.g.Rd7) 39.Qe5! fxe6 (otherwise black can't stop Re7, with a dominating position for white) 40.f7+ Rg7 41. e8=Q#

Time for review....

Oct-24-15
Premium Chessgames Member
  CHESSTTCAMPS: In B, I overlooked the specific game defense, which allows white to utilize the Qg7 mate threat.
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