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Thomas Beerdsen vs Anna Vitalyevna Zatonskih
Batavia (2018), Amsterdam NED, rd 6, Mar-01
Russian Game: Kaufmann Attack (C42)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Jul-01-19
Premium Chessgames Member
  Phony Benoni: Looks like a fork (38.Qxf8+ Kxf8 39.Qe6+) followed by much unpleasantness.
Jul-01-19  Steve.Patzer: Phony must edit 39. Ne6+
Jul-01-19
Premium Chessgames Member
  patzer2: Instead of 25...Nc6? 26. Nxc6 ± (+1.34 @ 19 ply, Stockfish 9 analysis of move 26.?), Black can improve with 25...Ng6 26. Ne1 ⩲ (+0.36 @ 23 ply, Stockfish 9 analysis of move 25...?).
Jul-01-19  lost in space: I love Mondays!

38. Qxf8+ Kxf8 39. Ne6+ with 40. Nxc7 to follow. 1:0

Jul-01-19
Premium Chessgames Member
  agb2002: The black knight protects e6 and the black queen is defenseless. Therefore, 38.Qxf8+ Kxf8 39.Ne6+, followed by 40.Nxc7, wins more than a knight.
Jul-01-19  Cheapo by the Dozen: I try to do Monday puzzles in a few seconds each, so I actually settled for the first big win I saw, which was Re8+.

That works too, altohough the game line is clearly better. :)

Jul-01-19  saturn2: 38. Qxf8+ Kxf8 39. Ne6+ wins
Jul-01-19  stacase: Spent too much time trying to promote the a7 Pawn and not enough time looking for the Monday Queen sacrifice move. But finally ...
Jul-01-19  Starship12: I didn't see Nf8 so i thought Ne6 is winning. When i saw the knight, i know it's gonna be a sacrifice of queen. Good game.
Jul-01-19
Premium Chessgames Member
  whiteshark: <38.Qxf8+ Kxf8 39.Ne6+>, and that's it!
Jul-01-19
Premium Chessgames Member
  malt: Queen sac Monday, 38.Q:f8+ K:f8 39.Ne6+ wins
Jul-01-19  TheaN: Loose queens are always prime targets and then I tend to check how Black ended up placing the royal pieces in such fashion. In this case it's clear she'd been lost for a while :>
Jul-01-19  mel gibson: I could easily see that White can gain a minor piece with a Queen sac & then a fork.

However I didn't see as Stockfish 10 has,
mate in 24!

38. Qxf8+

(38. Qxf8+ (♕b4xf8+ ♔g8xf8 ♘d4-e6+ ♔f8-g8 ♘e6xc7 ♖a8-c8 ♖e1xe8+ ♖d8xe8 ♘c7xe8 ♖c8xe8 a7-a8♕ ♖e8xa8 ♖a5xa8+ ♔g8-f7 ♖a8-a7+ ♔f7-f8 ♗f3xd5 g7-g6 ♖a7xh7 g6xf5 ♖h7-d7 ♔f8-e8 ♖d7-f7 f5-f4 ♖f7xf6 ♔e8-d7 ♖f6xf4 ♔d7-d6 ♖f4-f5 ♔d6-c5 g2-g4 ♔c5-b5 g4-g5 ♔b5-b4 g5-g6 ♔b4-c3 g6-g7 ♔c3-d4 g7-g8♕ ♔d4-c3 ♕g8-g4 ♔c3-d2 ♕g4-d4+ ♔d2-c1 ♕d4-c3+ ♔c1-b1 ♖f5-f1+) +M24/47 546)

Jul-01-19
Premium Chessgames Member
  louispaulsen88888888: RxB first occurred to me, but as the saying goes, when you see a good move, look for a better one. After QxKt ch, black can resign.
Jul-01-19  stodge: I explored 38. Bxd5+ first. If the king retreats into the corner as was my pre-caffeinated instinct, it's mate with 39. Qxf8, but players of this caliber wouldn't make such rookie mistakes.

Looks like 38. ..Ne6 39. Nxe6 threatens mate on the next move with 40. Qxf8 but is easily parried by 39. ..Bf7 opening up the rooks to protect f8. White does have Re8 but it's not enough.

If instead black defends right away with 38. ..Bf7 then my whole idea of a quick mate falls apart.

Jul-01-19  DrGridlock: Black is going to drop a minor piece, whether it's the bishop with:

Rxe8 Rxe8
Bxd5+ Kh8
Bxa8

or it's the knight with:

Qxf8 Kxf8
Ne6+ Kg8
Nxc7

In the "queen sac" line, white's pieces are in position to pick up more material in addition to the knight.

Jul-01-19
Premium Chessgames Member
  patzer2: This game features an off the beaten track opening line with 5. c4 (instead of the usual 5. d4) in the Petrov Defense.

Black defends well until 17...cxd4 18. Nb5 ± (+0.67 @ 21 ply, Stockfish 9 analysis of move 18.?) gives White the advantage.

Instead, Black can keep it level with 17...Qd6 = (-0.10 @ 21 ply, analysis of move 17...?).

Jul-01-19  TheaN: <DrGridlock: In the "queen sac" line, white's pieces are in position to pick up more material in addition to the knight.>

Not <just> that though. I vastly prefer the game line because Black is left with no play whatsoever. Her queen's guardian h2, so White has to be wary for back rank threats or perpetuals if the major pieces are given freedom.

Typically, they do in the 38.Rxe8 line. After 38....Rxe8 39.Bxd5+ Kh8 (Ne6 really doesn't work as the bishop's even guardian g2 in case White's forced to play g3) 40.Bxa8. Black doesn't have anything definite, but wouldn't be too happy to allow 40....Qc1+ 41.Kh2 Qf4+ just out of practice.

Yes, it works, but is not as decisive as the game line removes Black's only dark squares controlling piece.

Jul-01-19  DrGridlock: <Typically, they do in the 38.Rxe8 line. After 38....Rxe8 39.Bxd5+ Kh8 (Ne6 really doesn't work as the bishop's even guardian g2 in case White's forced to play g3) 40.Bxa8. Black doesn't have anything definite, but wouldn't be too happy to allow 40....Qc1+ 41.Kh2 Qf4+ just out of practice.>

It turns out that in your line, 41 ... Qf4+ leads to an even worse eval than the game line. After say 42 g3 Qd3 43 Bg2:

Thomas Beerdsen - Anna Vitalyevna Zatonskih


click for larger view

Black's got nothing. And he still has to fight off the a-pawn queening on a8. The "right" way to continue black's attack is for the queen to check on c7 rather than on f4 on move 41. After 42 g3 Rxa8 43 Qxf8 Rxf8 44 a8=Q

Thomas Beerdsen - Anna Vitalyevna Zatonskih


click for larger view

Black's back-rank problems are much more serious than white's.

But this is all a bit to calculate. Agreed that the game line is more quickly decisive.

Jul-01-19  TheaN: <DrGridlock: (...) But this is all a bit to calculate. Agreed that the game line is more quickly decisive.>

Great post and shows why Rxe8 also works, I know all perpetual possibilities are mere optical illusions, White's dominating the board. But your last sentence is the point I wanted to make :>.

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