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Konstantin Zaivelevich Lerner vs Michael Roiz
Israeli Championship (2008), Budapest HUN, rd 3, Dec-04
Semi-Slav Defense: General (D43)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Nov-03-18
Premium Chessgames Member
  al wazir: 19...Rxd4 was easy to find, but I didn't know what white would do in reply. (I thought 20. Qxd4 was unlikely because of 20...Bxe5.)

But after 20. Qxd4 Bxe5 was played, I saw no quick win. And there was none there. It took another 20 moves

Nov-03-18  stacase: I didn't see that Black recouped the sacrificed Rook (22...Bxa1)
Nov-03-18
Premium Chessgames Member
  An Englishman: Good Evening: The tough defense for me consisted of 20.g3. Can't believe how long it took to see 20...Qxe5.
Nov-03-18
Premium Chessgames Member
  patzer2: With White threatening 20. g3 Ī to +-, Black needs a desperado and 19...Rxd4! ∓ to -+ fills the bill, winning a pawn and shattering White's pawn structure in the game continuation.

P.S.: Black's game took a turn for the worse with 18. Qc3?, allowing 18...Bg4 ∓ to -+ (-1.61 @ 21 ply, Stockfish 9 analysis of move 18...?).

Instead, 18. Rae1 = (0.00 @ 23 ply, Stockfish 9 analysis of move 18.?) appears to hold the game level.

Nov-03-18  saturn2: wednesday vibes
Nov-03-18  saturn2: <AnEnglishman Can't believe how long it took to see 20...Qxe5.> Maybe you mean 20...Bxe5 because your move is R for N+P which should be bad for black.
Nov-03-18  Mayankk: Odd puzzle indeed. Just like yesterday.

Any puzzle where the first move springs to you almost immediately canít really be considered a good one. Agreed that it didnít lead to a quick win but there was nothing else to play anyway, other than Rxd4.

So whatís the idea here I wonder.

Nov-03-18  et1: Very nice - until 25 Kf7 it is bold but clear. Do you know what is the evaluation at that stage ?
Nov-03-18  Walter Glattke: Wins a pawn, 21.-Qf3? 22.Qxe5 Bh3 23.Nf6+ Kh8 24.Ne8+ Kh7 25.Qg7#
Nov-03-18  Cheapo by the Dozen: Pretty easy to find, actually. White has three main choices:

-- Concede the loss of a pawn (the game choice). -- Try Qxc6 immediately (catastrophically bad).
-- Play Nxg4 as a Zwischenzug on the way to Qxc6 (like the game choice, a way to lose slowly).

Nov-03-18
Premium Chessgames Member
  malt: 19...R:d4 20.N:g4
(20.Q:d4 B:e5 21.g3 B:d4)
20...Q:g4 21.h3 Qd7

20.Q:d4 B:e5 21.g3 Qf3 22.Q:e5 Bh3
23.Nf6+ Kh8 24.Be4

Nov-03-18  Walter Glattke: malt: see above 24.Ne8+ Kg8/h7 25.Qg7#
Nov-03-18  Ceri: <et1: Very nice - until 25 Kf7 it is bold but clear. Do you know what is the evaluation at that stage ?>

Stockfish 9 says:


click for larger view

Engine: Stockfish 9 64 Ceri (8192 MB)
by T. Romstad, M. Costalba, J. Kiiski, G.

41/59 3:53 -1.36 26.Re3 Bd5 27.h4 Ne6 28.Nxe6 Bxe6 29.Be2 Rd8 30.Rc3 Bd5 31.Bf1 Ke6 32.f3 Kf6 33.Kf2 g5 34.fxg5+ hxg5 35.hxg5+ Kxg5 36.Ke3 f4+ 37.Kf2 Kf5 38.Bd3+ Ke5 39.Be4 (4.471.046.709) 19148

42/63 3:53 -1.34 26.h4 Rd8 27.Re3 Bd5 28.Be2 Ne6 29.Nxe6 Bxe6 30.Rc3 Bd5 31.Bf1 Kf6 32.Bg2 Bc4 33.Bxc6 Rd4 34.h5 gxh5 35.Rh3 Bf7 36.Bxb5 Rxf4 37.Be2 Rxb4 38.Bxh5 Bxh5 39.Rxh5 (4.471.046.709) 19148

best move: h2-h4 time: 3:54.547 min n/s: 19.148.607 nodes: 4.471.046.709

Cheers,

Ceri

Nov-03-18
Premium Chessgames Member
  malt: Hi Walter what about 23...Kh8 24.Ne8+ f6
Nov-03-18  saturn2: <malt> black loses also here. 19...Rxd4 20. Qxd4 Bxe5 21. g3 Qf3 22. Qxe5 Bh3 23. Nf6+ Kh8 <24. Ne8+ f6 25. Qxf6+> Qxf6 26. Nxf6 Bxf1 27. Bxf1

<AnEnglishman> sorry I misunderstood your post. I was meaning after 20 QxRd4 black loses an exchange with 20..QxNe5 and you meant after 20 g3 this move is a good choice for black, which it is of course

Nov-03-18  landshark: I would have played the same thing OTB at least thru move 23 - but wouldn't have considered it a forcing win.
Nov-03-18
Premium Chessgames Member
  malt: <saturn2> Thanks I have just about the same line

19...Rxd4 20. Qxd4 Bxe5 21.g3 Qf3 22. Qxe5 Bh3 23. Nf6+ Kh8 24.Ne8+ f6 25. Qxf6+ Qxf6 26. Nxf6

I have 26...Kg7 27.Ne4 B:f1

Nov-03-18  Walter Glattke: malt: ok, only 27.Rfc1 Kxf6 29.Rxc6+ Kg7!? 30.Re1 no mate, only advanage.
Nov-03-18  Walter Glattke: Pittoresque could be 23.Be4 (malt) Ne6
24.Qe5 Qb3 but 23.Nf6+ Looks stronger then.
Nov-03-18  petemccabe: I'm with Stacase; when I was playing through, and black played 22 ... Bxa1, I was surprised. Too many pieces had to be cleared from that diagonal for me to see them all.

But quite a combination to win, ultimately, a single pawn.

Nov-03-18
Premium Chessgames Member
  agb2002: Black has the bishop pair for a bishop and a knight.

The bishop on g7 x-rays the white queen and the pawn on d4 protects the knight on e5. These details suggest 19... Rxd4. For example, 20.Qxd4 (amother option is Nxg4) 20... Bxe5 21.g3 (21.Qe3 Qxh2#) 21... Bxd4 22.gxf4 Bxa1, winning a pawn.

I don't have time for more.

Nov-03-18  et1: Ceri - many thanks.
Nov-03-18  mel gibson: I saw the first few moves straight
away but not the Rook being taken on a1.
Nov-03-18
Premium Chessgames Member
  Breunor: On 20 ...N g4 black's best isn't 21 Qg4 but R x e4:

Stockfish gives:

1) -2.11 (23 ply) 20...Rxe4 21.Qxc6 Ree8 22.Rae1 Rxe1 23.Rxe1 Rd8 24.Be2 Ne6 25.Ne3 Nd4 26.Qb7 Nxe2+ 27.Rxe2 Qxb4 28.g3 Qc5 29.Rc2 Bc3 30.Kg2 b4 31.a6 h5 32.Kg1 Rc8 33.Re2 Bd4 34.Kg2 Rd8

On Q x g4 we get:

1) -0.93 (21 ply) 21.Qxc6 Rad8 22.f3 Qf5 23.Bxb5 Rxb4 24.Rab1 Rxb1 25.Rxb1 Rb8 26.Qa6 Ne6 27.Bd3 Rxb1+ 28.Bxb1 Qd5 29.g3 Qd4+ 30.Nf2 Qe3 31.Qc8+ Kh7 32.Be4 Bd4 33.Qc2 Qe1+ 34.Kg2 Qxa5 35.Nd3 Qa1 36.Nc1 a5 37.Bd5 a4 38.Bxe6 fxe6

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