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Mark A Berkovich vs Milan Mostertman
Groningen Chess Festival (2009), Groningen NED, rd 2, Dec-22
Torre Attack: Classical Defense (A46)  ·  1-0



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Kibitzer's Corner
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Premium Chessgames Member
  watwinc: <RKnight> I think White can do better than just win the queen.For example 28 … Kf8 29 Nh7+ Ke8 30 Re1+ Kd7 31 Qe6# If 29 … Ke7 30 Re1+ Ne5 31 Qg7+ and White ends up four pawns ahead.
Premium Chessgames Member
  al wazir: 21. Rxe6 took me a couple of minutes to find, but the next four moves (all checks) and 26. Ng5 are easy. From that point on it depends what black does to defend. Both 26...Rd7 and 26...Ne5 are possible. Both are hopeless for black, but I didn't look that far ahead.
Feb-17-19  farticchio: I wrote Tfe8 because I am Italian...😕
Feb-17-19  sudoplatov: Well, the g6 Pawn has only one non-royal guard so 21.Re6 seems indicated. Black cannot take the Rook and anything else leaves a triple attack on g6.
Feb-17-19  thisisasign: Found 21.Rxe6, but I assumed fxe6 as continuation for Black. 22.Qxg6 Kh8 23.Qxh6+ Kg8 24.Ng5 and I think White's strong.
Feb-17-19  farticchio: but 21. ...Rfe8 is a good defense or not?
Feb-17-19  Walter Glattke: 24.Ng5 as this is a sign said, then 24.-Qg7 25.Qxg7+ Kg7 26.Nxe6+ Kf7 27.Nxf8 Rxf8 4 pawns for a knight. 22.Bxg6? Ne5! 25.Nxe5 Qxe5 black would win.
Feb-17-19  yadasampati: Insane? It took me 2 seconds: 21. Rxe6
Feb-17-19  farticchio: Perhaps insane 21...Rad8 ?
Feb-17-19  alphee: Cant't believe I got this one right in the blink of an eye and I see I am not the only one! Just applied the "remove the defender" concept.
Feb-17-19  ChessHigherCat: Seeing the first move is nothing unless you see the whole combination through to mate, because otherwise you would have lost on the board. I saw 21. Rxe6 right away, too, but I thought it was a spoiler because of 21... Bc8, pinning the rook. What I spaced out is that black can't interpose the Q after 22. Rxg6+ fxg6 23. Qxh6 Kh8 24. Qxh6+ because h7 is attacked twice.
Feb-17-19  goodevans: <ChessHigherCat: Seeing the first move is nothing unless you see the whole combination through to mate...>

l agree wholeheartedly with the sentiment. My only slight quibble is that it's even harder than that.

Here's what Stockfish reckons is best play if black accepts the sac:

21.Rxe6 fxe6 22.Qxg6+ Kh8 23.Qxh6+ Kg8 24.Ng5 Qg7 25.Qxe6+ Rf7 26.Bh7+ Kh8 27.Be4 Raf8 28.Qh3+ Kg8 29.Bh7+ Qxh7 30.Nxh7 Rxh7

The first four moves are pretty obvious but the rest, less so. What's more, whilst black is almost denuded of pawns, in terms of pieces he significantly outguns white. It's not at all clear to a patzer like me that white is winning this.

Seeing beyond the first few promising moves all the way to the win is tough indeed.

Premium Chessgames Member
  malt: Seen 21.R:e6 fe6 22.Q:g6+

looked at 21...Bc8 22.R:g6+ fg6
(23...Kh7 24.R:h6+ K:h6 25.Qg5# )

23.Q:g6+ Kh8 24.Q:h6+ Kg8 25.Bc4+

Feb-17-19  Everett: Karpov vs Topalov, 1994

A reminder of the “classics”

Feb-17-19  mel gibson: I thought pawn to h4 but I was wrong.
Stockfish 10 says:

21. Rxe6

(21. Rxe6 (♖e1xe6 ♖f8-e8 ♖e6xe8 ♖a8xe8 ♖a1-e1 ♖e8xe1+ ♘f3xe1 ♕c7-d6 ♗d3-f1 ♘c6-e7 ♕g4-a4 a7-a5 ♘e1-c2 ♕d6-d1 ♕a4-e8 ♘e7-f5 ♘c2-e3 ♘f5xe3 ♕e8xe3 ♗b7-a6 ♕e3-d4+ ♕d1xd4 c3xd4 ♗a6-b7 f2-f3 ♗b7-c6 ♔g1-f2 ♔g7-f6 ♗f1-d3 b6-b5 ♗d3-e4 ♗c6-d7 ♔f2-e3 ♔f6-e6 g2-g4 b5-b4 b2-b3 ♔e6-d6 ♔e3-f4 ♗d7-e6 h2-h4 ♗e6-d5 ♗e4xd5) +1.39/37 86)

score for White +1.39 depth 37

Feb-17-19  patzer2: Sunday puzzles are often positions where I would make a quiet non-threatening move OTB. However, because they are puzzles, I take the time to calculate as deeply as I can to find a combination.

In the case of today's Sunday puzzle (21. ?), I found the promising move 21. Rxe6!! and correctly played guess-the-move for the first six moves of the game continuation (i.e. 21. Rxe6!! Rad8 22. Rxg6+ fxg6 23. Qxg6+ Kh8 24. Qxh6+ Kg8 25. Bc4+ Rf7 26. Ng5 +-). But after 26...Ne5 I went for the win with 27. Qh7+ (instead of the game continuation 27. Bxf7+ Nxf7 Qg6+ +-) 27...Kf8 28. Ne6+ Ke7 29. Qh4+ Kd7 30. Nxc7 +-.

Perhaps the most difficult aspect of today's Sunday puzzle is not finding White's deeply calculated 21. Rxe6!!, but instead finding the best reply for Black. Black was correct not to accept the poisoned Rook with 21...fxe6+?, when White wins after 21...fxe6?? 22. Qxg6+ Kh8 23. Qxh6+ Kg8 24. Ng5 Qg7 25. Qxe6+ +- (+3.40 @ 30 ply, Stockfish 10). However, 21...Rad8? 22. Rxg6+ +- was not the right way to decline the Rook capture.

Instead, Black could have cut his losses to only a single pawn with 21...Rfe8 ±, when play might have continued 21...Rfe8 22. Rxe8 Rxe8 23. Qg3 Qxg3 24. fxg3 ± (+1.03 @ 35 ply, Stockfish 10) with practical drawing chances.

Feb-17-19  farticchio: Oh...
I agree with patzer2
In a OTB games is better a handicap of -1.00 than -13.00 🤓
Feb-17-19  1stboard: What happens if black plays ... 21 Ne7 ?
Feb-17-19  pdxjjb: Engine confirms that <ChessHigherCat> had this one right from the start. With best play, white wins only a pawn.

21 ... Rad8 is the losing move. If instead 21 ... Rfe8, white can hold the pawn, but had no obvious path to more.

And it would be all too tempting for white to respond with 22 Rxg6 which actually leads only to rough equality: white can win all black's K-side pawns in return for the sacrificed rook. The result is a really interesting unbalanced position but not any obvious advantage for white.

Premium Chessgames Member
  thegoodanarchist: White got the moster out of his position
Premium Chessgames Member
  agb2002: Black's f-pawn is overloaded. This suggests 21.Rxe6:

A) 21... fxe6 22.Qxg6+ Kh8 23.Qxh6+ Kg8 24.Ng5

A.1) 24... Rf7 25.Qg6+ Rg7 (25... Kf8 26.Nxe6+ wins; 25... Kh8 26.Nxf7+ wins) 26.Qxe6+

A.1.a) 26... Kh8 27.Qh6+ Kg8 28.Bc4+ Kf8 29.Qh8+ (or 29.Ne6+) wins.

A.1.b) 26... Kf8 27.Qf6+

A.1.b.i) 27... Ke8 28.Re1+ Re7 (28... Ne7 29.Qxg7 + -) 29.Bg6+ Kd7 (29... Kd8 30.Qf8+ Kd7 31.Rd1+ wins) 30.Bf5+ Kd8 (30... Ke8 31.Qh8#; 30... Re6 31.Qxe6+ Kd8 32.Qe8#) 31.Qh8+ Re8 32.Q(R)xe8#.

A.1.b.ii) 27... Kg8 28.Bc4+ Kh8 29.Nf7+ Kg8 (29... Kh7 30.Qh6+ Kg8 31.Qh8#) 30.Nd8+ Kh7 (30... Kh8 31.Qh6+ Rh7 32.Qf8#) 31.Qh4+ Kg6 32.Bd3#.

A.1.b.iii) 27... Rf7 28.Ne6+ Kg8 (28... Ke8 29.Nxc7+ wins) 29.Qg6+ Rg7 30.Nxc7 Rxg6 31.Bxg6 wins decisive material.

A.2) 24... Nd8 25.Bh7+ Qxh7 (25... Kh8 26.Qxf8#) 26.Qxh7#.

A.3) 24... Ne5 25.Bh7+ Kh8 26.Bf5+ Kg8 27.Bxe6+ Rf7 (27... Nf7 28.Qh7#) 28.Bxf7+ Nxf7 29.Qh7+ Kf8 30.Ne6+ and 31.Nxc7 wins.

A.4) 24... Qg7 25.Qxg7+ Kxg7 26.Nxe6+ followed by 27.Nxf8 and White ends up with four pawns for a knight.

B) 21... Bc8 22.Rxg6+ fxg6 (22... Kh8 23.Rxh6#; 22... Kh7 23.Rg7+ Kh8 24.Rh7#) 23.Qxg6+ Kh8 24.Qxh6+ Kg8 25.Bc4+ Rf7 26.Ng5 Ne5 27.Bxf7+ Nxf7 28.Qg6+ Kf8 (28... Kh8 29.Nxf7+ wins) 29.Nh7+

B.1) 29... Ke7 30.Qf6+ Ke8 (30... Kd7 31.Qxf7+ wins decisive material) 31.Re1+ wins.

B.2) 29... Ke8 30.Re1+ Kd8 31.Qg8+ Kd7 32.Qxf7+ wins decisive material.

Feb-17-19  cormier:

click for larger view

Analysis by Houdini 4 <d 25 dpa done

1. + / = (0.30): 18...Kh8> 19.Rxe6 Rfd8 20.Qh3 Bf8 21.Re3 Re8 22.Rae1 Rxe3 23.Rxe3 Rd8 24.Qh4 Kg7 25.Bc2 Bc8 26.Re1 a6 27.Qe4 b5 28.a4 b4 29.Qc4 Rd7 30.b3 Na5 31.Qxc7 Rxc7 32.c4 Bb7 33.Ne5 Re7 34.Nd3 Rxe1+ 35.Nxe1 Bc8 36.Ne2 Nc6 37.Nf4 Nd4 38.Nd5 a5

2. + / = (0.70): 18...Bf6 19.Nh5 Bg7 20.Nxg7 Kxg7 21.Rxe6 Rfe8 22.Rxe8 Rxe8 23.Rd1 Ne5 24.Nxe5 Qxe5 25.Bf1 Bc8 26.Qa4 Re7 27.Rd8 Bf5 28.Qd1 g5 29.Rd5 Qe4 30.h3 Be6 31.Rd4 Qe5 32.a3 Bf5 33.Rd5 Qe4 34.Rd6 Be6 35.Bd3 Qe5 36.Bc2 Re8 37.a4 Bc4 38.Rc6

Feb-17-19  landshark: <goodevens> <chc> I'm on board with you guys. I found this one to be tough -
Feb-17-19  cormier:

click for larger view

Analysis by Houdini 4 <d 27 dpa done>

1. = (0.00): 16...Rd8 17.Rad1 Bb7 18.Nh5 Bf8 19.Nh4 Ne7 20.Qg4 Kh8 21.Nf3 Nf5 22.Bxf5 exf5 23.Qxf5 Rxd1 24.Rxd1 Rd8 25.Nd4 Rd5 26.Qh3 Rg5 27.Ng3 Kg8 28.a3 Bc5 29.Nb3 Bd6 30.Nd4 Bc5 31.Nb3

2. = (0.00): 16...Bd6 17.Ne4 Be7 18.Ng3 Rd8

Feb-17-19  Ron game: I figured out my first Sunday puzzle
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