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Mikhail Gurevich vs Nicholas Pert
European Championship (2007), Dresden GER, rd 7, Apr-09
Slav Defense: Modern Line (D11)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Jan-26-19
Premium Chessgames Member
  Penguincw: Given QPPP vs. QPP endings, the superior side wins 52.3% of the time, and it's a draw 41.8% of the time.

Endgame Explorer: QPPP vs QPP

Jan-26-19  dumbgai: Interesting that black played 43...Kg8 instead of repeating with Kh6. Maybe he thought Kh6 the previous time was a mistake and thought Kg8 was an improvement? Didn’t work out well for him though.
Jan-26-19
Premium Chessgames Member
  al wazir: This puzzle is a cheat.

The combination beginning on move 14 wins one (1) lousy ♙. Thereafter the game continues 50 moves before white finally brings home the point. Needless to say, I didn't solve it.

Who knows if black would have been able to draw with better play? In the game line I thought 15...Rab8 was a waste of time and a mistake. Black could equally well have defended with 15...Bc8 (which he played on the next move anyway), and by leaving the ♖ on a8 he would have avoided the eventual 19. Nxb8.

Jan-26-19  Infohunter: Statistics be what they may, White is 100% certain of winning this one, barring crass blunders. After 64...Qxf6+ 65.Kxf6 it would take Black a minimum of six moves to Queen a Pawn, while White Queens in just three moves. The time advantage is ample for White.
Jan-26-19  mel gibson: This game was almost perfectly balanced.
It was about whether to make an attack on the Queen's side or the middle or the King's side.

Stockfish 10 chooses to make it more balanced.

14. Re1

(14. Re1 {(Rd1-e1 Qe7-d6 Qb3-c2 Nh5-f6 h2-h3 Ra8-c8 Bd3-f5 Rc8-d8 Re1-d1 g7-g6 Bf5-d3 a7-a5 b2-b3 Qd6-a3 Rd1-e1 Rd8-b8 Nf3-d2 Rb8-c8 Rc1-b1 Qa3-e7 Nd2-f3 h7-h6 Rb1-c1 Kg8-g7 Qc2-b2 Nf6-e4 Bd3xe4 d5xe4 Nf3-d2 f7-f5 Nd2-c4 Bb7-a6 Nc3-e2 Ba6xc4 b3xc4) +0.64/36)

score for White +0.64 depth 36.

However if we follow the chosen move by White it gives Black a 1 pawn advantage:

14.
Nxd5 cxd5

(14. .. cxd5 (c6xd5 ♖c1-c7 ♖e8-b8 ♘f3-e5 ♘h5-f6 ♘e5xd7 ♘f6-e8 ♖c7xb7 ♖b8xb7 ♘d7-e5 ♘e8-f6 ♗d3-a6 ♖b7-c7 ♘e5-d3 ♕e7-d6 h2-h3 ♖a8-d8 a2-a3 ♘f6-e4 ♘d3-b4 g7-g6 ♕b3-d3 ♔g8-g7 ♕d3-e2 h7-h6 ♖d1-f1 ♕d6-f6 ♕e2-d1 ♕f6-e6 ♖f1-e1 ♕e6-d7 ♕d1-e2 ♘e4-f6 ♗a6-d3 ♕d7-e6 ♗d3-a6 ♖d8-b8 ♗a6-d3 ♖b8-c8 ♗d3-a6 ♖c8-d8 ♕e2-d3 ♕e6-d6 ♕d3-d1 ♕d6-d7 ♕d1-e2) +0.98/39)

score for Black +0.98

I tested g4 as a possible King side attack.

(14. g4 Nhf6

(14. .. Nhf6 (♘h5-f6 h2-h3 ♘f6-e4
♕b3-c2 ♖a8-c8 ♕c2-a4 ♘e4-d6 ♔g1-g2 h7-h6 ♕a4-a3 ♖c8-a8 ♗d3-e2 ♘d7-f8 ♗e2-d3 ♘f8-e6 ♗d3-e2 ♘e6-g5 ♕a3-b3 ♘g5-e4 ♘c3xe4 ♘d6xe4 ♘f3-d2 ♘e4xd2 ♖d1xd2 c6-c5 d4xc5 b6xc5 ♗e2-f3 ♖a8-d8 ♖d2-d1 c5-c4 ♕b3-c3) +0.51/31))

score for Black +0.51

Jan-26-19  Boerboel Guy: <dumbgai: Interesting that black played 43...Kg8 instead of repeating with Kh6.>

I agree!

Jan-26-19  groog: yup, made me wonder too why 43...Kg8
Jan-26-19  bahduggi: Given as a puzzle, the first two moves are obvious enough. Knowing I had neither the patience nor the skill to take it all the way there, I wouldn't bother trying, but, turns out there was no 'there' there.
Jan-26-19  Walter Glattke: I think for 16.-Qd6 17.Rec1 Nc5 not as solid as Stockfish, more pittoresque.
Jan-26-19  vesivialvy93: how it is possible to missed 63.Qe6+ forcing the excange and winning clearly ???!!!
Jan-26-19
Premium Chessgames Member
  agb2002: The knight on h5 is defenseless (and also b7 and c7) and ceased protecting d5. These details suggest 14.Nxd5 cxd5 15.Rc7:

A) 15... Bc8 16.Qxd5, with the double threat Qxa8 and Qxh5, seems to win decisive material.

B) 15... Reb8 16.Rxb7

B.1) 16... Rxb7 17.Qxd5 is similar to A.

B.2) 16... Rbc8 (hoping to trap the rook) 17.Ne5 Nhf6 18.Nxd7 Nxd7 19.Bf5 Rd8 20.Qxd5 wins decisive material.

C) 15... Qd8 16.Rxb7 Qc8 17.Ba6 seems to win a pawn at least.

D) 15... Qd6 16.Rxb7

D.1) 16... Qc6 17.Ba6 followed by a4-a5 looks goid for White.

D.2) 16... Rec8 (preparing g6-Ng7-Ne6-Nd8) 17.Qa4, with the double threat Rxd7 and Rxa7, seems to win a pawn at least.

D.3) 16... Nf8 17.Rc1 Rec8 18.Rxc8+ Rxc8 19.Rxa7 Rc1+ 20.Bf1 wins two pawns at least.

Jan-26-19
Premium Chessgames Member
  agb2002: In my line B, 16.Rxb7 loses to 16... Rxb7 17.Qxd5 Ndf6, protecting both pieces. Once the white rook disappears this knight can move...
Jan-26-19  erixn: I don't know about time control in this tournament... but for a GM to be missing 59.Qe4+ looks odd (he seems to be preparing just that with his preceding moves)
Jan-26-19  malt: Got 14.N:d5 cd5 15.Rc7 Rab8
(15...Bc8 16.Q:d5 )

16.Ne5 Nhf6 looks equal.

Jan-26-19  Spassfish: This is NOT a puzzle. It is half of a game that could have gone anywhere. Disappointing selection. Might as well have been e4 figure it out from there yourself.
Jan-26-19  RKnight: <Spassfish> Actually it is more like 3/4 of a game. It definitely is not a puzzle. In the past couple of weeks CG has had some good puzzles, some repeats, and some "what the heck is this?" positions.
Jan-26-19  Ceri: Hi all, I also tried Stockfish 10 out on the puzzle position:


click for larger view

42 +0.59 14.Re1 Qd6 15.Qc2 Nhf6 16.h3 Rac8 17.Red1 Qe7 18.Qa4 a5 9.Qb3 Qb4 20.Qc2 Qe7 21.Nh4 Qe6 22.Nf5 g6 23.Ng3 Qe7 24.a3 Kg7 25.Nge2 Ra8 26.Re1 Qd6 27.Na4 (37.228.288.107)

41 0.55 14.a3 Nhf6 15.Qb4 Qe6 16.h3 h6 17.Ne2 a5 18.Qb3 Qd6 19.Qc2 Qe7 20.Nc3 g6 21.Re1 Ne4 22.Na4 Rab8 23.Red1 Nef6 24.Nd2 Kg7 25.Be2 Qd6 26.Nc3 Qe7 27.Re1

41 +0.55 14.Be2 Nhf6 15.a3 g6 6.Qc2 a5 17.Nd2 Kg7 18.Bf3 Rac8 19.h3 h6 20.Rb1 Rb8 21.Ra1 Nh7 22.Be2 Nhf6 23.Qb3 Ra8 24.Re1 Qd6 25.Rad1 Rac8 26.Rc1 Ra8 27.Qc2

41 +0.55 14.h3 Nhf6 15.Nd2 h6 16.Be2 Rac8 17.Nf1 g6 18.Nd2 Kg7 19.Qa4 Ra8 20.a3 a5 21.Re1 Qd6 22.Qc2 Rac8 23.Bf3 Rcd8 24.Red1 Qe7 25.Qb3 Rc8 26.Be2 Ra8 27.Qa4

best move: Rd1-e1 time: 48:02.734 min nodes: 37.228.288.107

I also ran it after the game line:


click for larger view

I don't know about you folks, but what human player would prefer Reb8 to Rab8?

40 -1.09 15...Reb8 16.Ne5 Nhf6 7.Nxd7 Ne8 18.Rxb7 Rxb7 19.Ne5 Nf6 20.Ba6 Rc7 21.Nd3 Qd6 22.Rb1 Rd8 23.Qd1 Qd7 24.a4 Ne4 25.Nf4 g5 26.Nd3 Qf5 27.Qe2 Kg7 28.Rf1 h6

40 -0.23 15...Rab8 16.Ne5 Nhf6 17.Nxd7 Nxd7 18.Bb5 Bc8 19.Qa4 Qd8 20.Bxd7 Qxc7 21.Bxe8 Bg4 22.f3 Bf5 23.e4 dxe4 24.fxe4 Bxe4 25.Qd7 Qxd7 26.Bxd7 Kf8 27.Rc1 Ke7 28.Rc7 Rb7

40 +2.60 15...Qd6 16.Rxb7

39 +2.50 15...Qe6 16.Rxb7 Qc6 17.Ba6 Nhf6 18.h3 Ne4 19.Qb5 Qc2 20.Rf1 Ndf6 21.Qb4 Re6 22.Qa3 Qc6 23.Ne5 Qd6 24.Qxd6 Nxd6 25.Rc7 Kf8 26.Rfc1 Nfe8 27.R7c2 h5 28.Bd3 g6

best move: Re8-b8 time: 8:35.687 min n/s: 14.722.544 nodes: 7.592.166.059

Cheers,

Ceri

Jan-26-19  Walter Glattke: Of Course 16.-Qd6? 17.Rxd7! so 16.-Nhf6 is correct. 16.-Nhf6 17.Qa4? Qd6 18.Rdc1 Nc5!, so 17.Nxd7 as Stockfish says.
Jan-26-19  saturn2: I thought white wins back the piece by pinning d7 and will end with a pawn up.

14 Nxd5 cxd5 15.Rc7 Reb8 16. Ne5 Nhf6 17. Nxd7 Nxd7 18. Bb5

I did not see the computer move 17..Ne8!

Jan-26-19  NBZ: <al wazir>: I thought 15...Bc8 runs into 16. Qxd5 forking rook and knight, and that's why playing a rook to b8 is necessary.
Jan-26-19
Premium Chessgames Member
  ajk68: 59. Qe4+ is obvious. I'm amazed Gurevich missed it.
Jan-28-19
Premium Chessgames Member
  al wazir: NBZ: 15...Bc8 runs into 16. Qxd5 forking rook and knight>. You're right. Thanks.
Apr-10-19  cormier:


click for larger view

Analysis by Houdini 4 d 24 dpa done

1. = (0.15): 8...h6 9.Bh4 c5 10.0-0 cxd4 11.exd4 dxc4 12.Bxc4 a6 13.a4 b6 14.Rad1 Bb7 15.Ne5 Kh8 16.Nxd7 Nxd7 17.Bg3 Bh4 18.d5 Bxg3 19.hxg3 e5 20.Qc2 Nf6 21.d6 Qd7 22.b3 Rac8 23.f3 Rfd8 24.g4

2. = (0.20): 8...dxc4 9.Qxc4 c5 10.Bxf6 Nxf6 11.dxc5 Qc7 12.Rc1 Qxc5 13.Qxc5 Bxc5 14.Ke2 Be7 15.Rhd1 Rd8 16.Ne5 g6 17.f4 Kg7 18.Kf2 Nd7 19.Nc4 Nf6 20.Be2 Bd7 21.Bf3 Rab8 22.Ne5

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