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Alexandr Hilario Takeda dos Santos Fier vs Koen Leenhouts
9th Batavia GM (2017), Amsterdam NED, rd 5, Feb-28
Sicilian Defense: Paulsen. Bastrikov Variation (B48)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Aug-26-18
Premium Chessgames Member
  An Englishman: Good Evening: A true speculative sac. Can't foresee all of the variations, but the obvious Exchange sacrifice seems like a worthwhile gamble--that Knight does more work than both Black Rooks.
Aug-26-18  stacase: <An Englishman: ... A true speculative sac. Can't foresee ...>

I've asked the question on this board before, "How far ahead are we expected to solve one of these insane puzzles?"

Nobody has a good answer.

"speculative sac" Nice term (-:

Aug-26-18  pdxjjb: This one is way beyond me, so, chess engine.

Interesting, Stockfish 9 thinks the sac is literally the only move that maintains an advantage for white. According to the engine, both players are very accurate after the sac until black tries the Q-side pawn storm on move 24.

So this is not a traditional "puzzle" at all; it's a matter of finding how to maintain a slight advantage in a complex midgame until black goes wrong (... a5 ... a4) and then exploiting it.

Aug-26-18
Premium Chessgames Member
  WorstPlayerEver: 24... Rb5 25. Be1 h4 26. Qd3 Qxd5 27. Qxd5 Rxd5 28. Rxd5


click for larger view

24... Rb5 25. Be1 Rg8 26. e6


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26... Kf8 27. exd7 Qxd7 28. Nf6 Qxd1+ 29. Qxd1 Bxf6 30. Qd6+ Kg7 31. Qa6 Rgb8


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Aug-26-18
Premium Chessgames Member
  WorstPlayerEver: PS First line (above) 24... Rb5 25. Be1 h4 26. Qd3 Qxd5 27. Qxd5 Rxd5 28. Rxd5 Rh6 29. Rd2 Rg6 30. Re2 Kd8 31. b3 Kc7 32. Kb2 a5 33. c3 Kc6 34. cxb4 axb4 35. Kc2 Kd5 36. Kd3


click for larger view

White is a pawn up, but I see no win.

Aug-26-18  Walter Glattke: Tartakower fail to resign: Find a better continuation than 29.-Qxd7 30.Qf6+ Ke8 31.Qxh8+ Ke7 32.Qxb8?? Qd1#, so probably draw after 32.Bc5+ Ke6 33.Qf6+ Kd5 33.Ba7!? Ke4 where is the mate, please?
Aug-26-18  newzild: <Walter Glattke>

Your variations are mostly correct, but Black does not have 32...Qd1# because White's king is defending that square.

So White wins after your 32. Qxb8.

Aug-26-18
Premium Chessgames Member
  malt: <stacase 20.Rxd5 was fairly obvious,> 20...ed5 White has;

21.Q:d5 Rc8
21.Bb6 Qc4 22.b3 Qe4
21.Nb6 Rb8 22.N:d5 Black has the exchange

Nice to see things, getting back to normal.

Aug-26-18  mel gibson: I saw the first move easily.

Stockfish 9 says mate in 29 when Black resigns.

Aug-26-18  Mayankk: I saw the first 3 moves but that’s it. 23 Bf2 and 24 Rd1 are slow developing moves and seem risky given that White is down the exchange.

Without an obvious forcing combination after 22 Nxd5, chances are that someone will find a strong defence for Black. However in practical play, this sac will probably work as it gives White lots of active play and Black lots of chances to go wrong.

Aug-26-18  Walter Glattke: Oh yes, Kc1, not Kb1, no mate by Qd1
Aug-26-18  Walter Glattke: 32.Qxb8 wins then.
Aug-26-18  sfm: <mel gibson: Stockfish 9 says mate in 29 when Black resigns.> "Mate in 29 moves" My God, what a world we are living in.
Aug-26-18
Premium Chessgames Member
  agb2002: White has a bishop and a knight for the bishop pair.

Black threatens Bxf3 and Bxa2 would be possible if the queen leaves the third rank.

The first idea that comes to mind is 20.Rxd5 exd5 (20... Qc6 21.Ra5) 21.Nb6, probably with enough compensation for the exchange.

For example, 21... Rb8 22.Nxd5 Qc6 23.Qd3 Qxg2 24.Qxa6 Qxh1 25.Qa8+ Kc7 (25... Ke7 26.Qe8#) 26.Ne8+ Kc6 27.Qa6+ Rb6 (27... Kd5 28.Nf6#) 28.Qxb6+ Kd5 29.Nf6+ (better than 29.Qb7+ and 30.Qxh1) 29... Kc4 30.b3+ Kc3 31.B(Q)d4#.

Aug-26-18  catlover: Nice. This puzzle deserves the four stars.
Aug-26-18
Premium Chessgames Member
  gawain: So . . . we are back on true puzzle schedule. This is a new puzzle and it is Sunday and the puzzle is quite insane. Hooray and thank you!
Aug-26-18  cormier: 17...Nf5??

but


click for larger view

Analysis by Houdini 4: d 23 dpa done

<1. = (-0.02): 17...Rc8> 18.Kb1 Nf5 19.Bf2 Nxd4 20.Rxd4 Bc6 21.Rc4 Be7 22.b3 Qb7 23.Bd4 0-0 24.Nb2 f5 25.exf6 Bxf6 26.Qg3 Nc3+ 27.Bxc3 Bxe4 28.Bxf6 Rxf6 29.Rxc8+ Qxc8 30.Nd3 Qc7 31.Re1 d5 32.Nxb4 Rxf4 33.Nd3 Rf7 34.Qe3 Qc3 35.Qc5 Qd2 36.Qc8+ Kg7

2. = (0.14): 17...h4 18.Bf2 Rc8 19.Rhe1 Qa5 20.b3 Nf5 21.Kb1 Nfe7 22.Ka1 Nf5 23.Rd2 Ba8 24.Bxd5 Bxd5 25.Qd3 Ne7 26.Nf3 Bh6 27.Ng5 Bxg5 28.fxg5 Nf5 29.Nb6 Rc3 30.Qe2 Ng3 31.Qg4

Aug-26-18  Mayankk: Just to add, after the first 3 moves I wanted to play 23 Nf6+ and 24 Qd3, in order to pile pressure on d7.

Was that a worthwhile line or is it a must to develop Bishop and Rook first before attacking further?

Aug-27-18  patzer2: Thanks <chessgames.com> for starting to get the puzzles and the site back on track.

Today's Sunday solution 20. Rxe5! exd5 21. Nb6 Rb8 22. Nxd5 ± to +- (+0.44 @ 34 ply, Stockfish 9) is an instructive example of a sound positional exchange sacrifice.

Material wise, White gives up a Bishop and a pawn (4 points ) for a Rook (5 points) which by the pawn count is a minus one.

However from a positional perspective, White shatters Black's pawn structure leaving the second player with four isolated pawns. In addition, the Black King is left unable to castle and subject to a potential attack from White's more active pieces and solid pawn structure.

From a tactical point of view, it's not a situation where White gains a tremendous winning advantage. The real point is the alternatives to 20. Rxe5! are worse. Specifically, Stockfish 9 gives the second best line as 20. Qe2 Bc6 21. Nb6 Rb8 ∓ (-0.61 @ 32 ply) with a clear Black advantage.

So if 20. Rxe5! is not clearly winning, where does White gain a decisive or near decisive advantage? Black's game takes a significant turn for the worse after 24... a5?!, allowing 25. Qd3 ± (+1.25 @ 29 ply, Stockfish 9).

Instead, 24...Rb5 25.Qd3 Rg8 ⩲ (+0.42 @ 33 ply, Stockfish 9) would have enabled Black to keep the contest near level.

Black's game goes from bad to worse after 25...a4?, allowing 25. Nxe7 +- (+2.64 @ 30 ply, Stockfish 9).

Instead, 25...Rb7 26. b3 Rh6 27. Kb1 ± (+1.17 @ 32 ply, Stockfish 9) would have put up maximum resistance to give Black practical drawing chances.

Earlier, as <cormier>'s post indicates, Black can apparently improve over 17...Nf5 18. Nxf5 ⩲ (+0.42 @ 31 ply, Stockfish 9) with 17...Rc8 = (-0.19 @ 31ply, Stockfish 9).

Sep-17-18  Abdunnaser: Not a Monday puzzel
Sep-17-18
Premium Chessgames Member
  Check It Out: Chessgames is obviously not adhering to the "easy monday" paradigm.
Sep-17-18  saturn2: I would have played the exchange sacrifice. But I felt like a blind chess fool looking too long for an easy win.
Sep-17-18  amateur05: Is it me or the puzzles have become too difficult/unclear recently?
Sep-17-18
Premium Chessgames Member
  Williebob: This was a Sunday “Insane” puzzle recently. The puzzles are posting a bit askew right now but I believe the site’s new administration is still learning the code. Hang in there!
Sep-17-18  dumbgai: I like the current state of daily puzzles. You don’t know how difficult it’s actually supposed to be, so you have to consider all moves instead of just looking for the obvious Queen sac on Mondays.
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