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Yi Ren Daniel Chan vs Eduardo Francisco Galvez Dastin
Olympiad (2008), Dresden GER, rd 7, Nov-20
Caro-Kann Defense: Bronstein-Larsen Variation (B16)  ·  1-0
ANALYSIS [x]

FEN COPIED

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sac: 24.Bxc6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jun-21-18  et1: This one was easy.
Jun-21-18  Walter Glattke: No help by 25.Bxc6 Qf1+? 26.Ka2 Qa6!?, then 27.Bxb7++ and quick end.
Jun-21-18
Premium Chessgames Member
  gofer: Well the first two moves are obvious, but as <agb2002> points out even after the game continuation there is some wriggle-room for black. I went with the following...

<24 Bxc6 bxc6>
<25 Rxc6+ Kd8>
<26 Qc7+ Ke8>
<27 Rxb6 ...>


click for larger view

This variation stops any black queen checks after the first one and threatens Rb8#. So after 27 ... Qg1+/Qf1+/Qe1+ 28 Ka2 black has no choice but to play Kf8 to try to escape, but that's seems to be a fools errand...

27 ... Kf8 28 Rb7 mating!

So, black probably has to sacrifice its queen for Rb6.

~~~

Yep, Stockfish agrees. The only option for black is Qxb6, stopping the mate, but losing the game.

Jun-21-18
Premium Chessgames Member
  Richard Taylor: I thought it was Bxc6. I have to say I didn't see the game lines as played. However I was on the right track...
Jun-21-18
Premium Chessgames Member
  Richard Taylor: Mind you these things are only easy if one is experienced at chess. When starting out, it would look silly to give up a bishop.

So it's only easy if you have seen the patterns...

Jun-21-18
Premium Chessgames Member
  malt: Have gone for 24.B:c6 Qf1+
(24...bc6 25.R:c6+ Kd8 26.Qb8+ )

25.Ka2 bc6 26.R:c6+ Kd8 27.Q:b6+

Jun-21-18  takchess: Happy Thursday. The only two options I saw to start it off is does the rook or the bishop take the pawn. Clearly it's the bishop; I didn't calculate every step but something I would see OTB.
Jun-21-18  Returning Native: < RT Mind you these things are only easy if one is experienced at chess. When starting out, it would look silly to give up a bishop. So it's only easy if you have seen the patterns..>.

Right. A lot of people at club level are wary of any kind of sacrifice. It's a comfort zone thing.

Jun-21-18  Marmot PFL: Seems like most everyone found the rather obvious Bxc6. Spent a few minutes wondering what black's defense could be and why his was difficult. Finding the mating threat line is a bit harder but at that point white has various ways to win. First idea was Qxb6 and play the rook ending with three passed pawns.
Jun-21-18
Premium Chessgames Member
  ChessHigherCat: I like <gofer's> variant, because it maintains the threats while preventing Qc4+.
Jun-21-18  lost in space: Got that quickly and had also a lock to Black checks with the queen. So far so good for this week.
Jun-21-18  lost in space:


click for larger view

I like there sadistic 26. b3 and Black can not safe the game - especially not the Nb6 without being mated. I even think it is one of the best moves in this position. Try it!


click for larger view

Jun-21-18  messachess: Fairly easy with bishop sac. obvious.
Aug-12-18
Premium Chessgames Member
  ChessHigherCat: I remember the trick is to prevent the perpetual with Qf1+ Qc4+

so 24. Bxc6 bxc6 25. Rxc6+ Kd8 26. Rxb6 Qf1+ 27. Ka2 Qc4+ 28. Rb3 Re8 29. a4 e5 30. Ka3

leads to this:


click for larger view

and now black has nyuttink, right?

Aug-12-18
Premium Chessgames Member
  malt: Put this puzzle forward for today.


click for larger view

35.?

Jobava vs Kiril D Georgiev, 2009

Aug-12-18  CHESSTTCAMPS: White is down by N+P for a bishop, but the white major pieces are coordinated against the black king, while the black rook is effectively out-of-play. A simple demolition of the king's pawn protection is in order - 24.Bxc6! leaves no viable defense:

A. 24... bc 25.Rxc6+ Kd8 26.Qb8+! (26.Rxb6 Qf1+ 27.Ka2 Qc4+ 28.Rb3 is more difficult) Kd7/e7 27.Qd6+ Ke8 28.Rc7! (preventing the Qf2-f1-c4+ defense) Nd5 28.Qd7+ Kf8 29.Qxf7#

B. 24... N moves 25.Qxb7+ Kd8 26.Qd7#

C. 24... Kc7 25.Qxb7+ Kd6 (Kd8 26.Rd3+ Nd5 Qd7#) 26.Rd3+3 Kc5 (Ke5 27.Qc7+ Kf5/f4 28.Rf3+ wins) 27.b4+ Kc4 28.Qa5#

D. 24... Qe1+ 25.Ka2 Qxc3 26.Qxb7+ Kd8 27.Qxb6+ Ke7 28.bc wins.

Time for review...

Aug-12-18  Boerboel Guy: This should be a Tuesday or a Wednesday puzzle.
Aug-12-18
Premium Chessgames Member
  patzer2: I was vacationing with family when today's Sunday puzzle was a Thursday June 21, 2018 puzzle.

As <messachess> observes it is <Fairly easy with bishop sac. obvious.> Not only does 24. Bxc6 +- (+10.66 @ 36 ply, Stockfish 9 analysis of move 24.?) win easy, but the second best move, the quiet 24. Ka2 +- (+9.30 @ 36 ply, Stockfish 9) also wins easy for White.

P.S.: The reason I am away so much from posting recently is not just that the daily puzzles here have turned into recent reruns.

A change in my diet and exercise regimen has also competed for my time. I changed my diet to a high fiber, low cholesterol, calorie controlled plan which includes no red meat or sugar deserts and almost no dairy (except for some lactose free milk to make the soy and almond milk taste better and low calorie yogurt).

I've also incorporating daily aerobic exercise with 5 mile daily walks (i.e. 10,000 or more steps per day on my Fitbit) and mixed it up with twice a week trips to a local pool and gym for strength training and cross training exercises. As a result, I've lost 30 pounds in the past three months and gone off blood pressure medications. A young healthy, athletic doctor, 30 years my junior, had a number of tests run and told me the results now show my heart and arteries are healthy and clear -- as good as his.

Losing the weight and sticking to the diet was a real struggle for the first three weeks, but going to five small calorie meals (about 300 calories each) and taking a fiber supplement (generic Metamucil from Walmart) three times per day helped kill the hunger and allowed me to stay faithful to the diet plan. The diet change also caused some constipation at first, but an occasional does of Miralax quickly fixed the problem.

With the reduced calories and more exercise, the pounds slowly but surely melted and I've gone from overweight/near obese to normal BMI weight. Breaking the caffeine and diet soda habit was one of the hardest things to do, but now I have far more energy than I ever had drinking carbonated, caffeinated drinks.

My wife has also joined me in exercising more (she also now has a Fitbit) and eating better and has lost 10 pounds (she wasn't overweight to start), and as a result has seen her blood pressure go from above normal to normal.

Now comes the hard part -- sticking to the plan and not falling back into old unhealthy habits of not exercising enough and not eating right. If that means less time here, then so be it.

Aug-12-18  jayfreeman: Funny - sometimes "4 stars" are much easier than "2 stars" :) It is just impossible not to solve this one within a minute. I remember 2 star puzzles that took me half an hour.
Aug-12-18  stacase: <Aug-12-18 Boerboel Guy: This should be a Tuesday or a Wednesday puzzle.

Aug-12-18
Premium patzer2 ... today's Sunday puzzle was a Thursday June 21, 2018 puzzle.>

Bingo! I thought it wasn't up to Sunday's usual "I don 't have a clue" status.

Aug-12-18
Premium Chessgames Member
  catlover: <patzer2>, congratulations on losing 30 pounds and pursuing a healthier lifestyle. That is not easy to do.

If your new lifestyle does indeed result in you visiting this site less often and posting with less frequency, you will be missed. I have especially appreciated your posts about the POTD.

Aug-12-18
Premium Chessgames Member
  patzer2: <catlover> Thanks! If chessgames.com gets back on track with new puzzles, I may resume posting regularly.

However, the emphasis on my part, as it has been for most of this year, will be in finding where the losing side went wrong.

There's lots of good analysis here of the actual puzzle combinations, but much less on where the game went wrong and how the winning side got the winning combination.

Aug-12-18  gabriel25: It is a fairly easy but it has a little quirk if you take the knight that seems undefended you run into a check that makes everything messy, so having it complete is not that easy. A possible idea for the moment is looking for games of people with strange names that are usually included because they have some peculiarity
Aug-12-18
Premium Chessgames Member
  patzer2: Black's decisive mistake in this game appears to be 19...Rxd4?, allowing 20. Qxa7+ Kc7 21. Rxd4 Qxd4 22. Rc3 +- (+2.00 @ 34 ply, Stockfish 9).

Instead, 19...Nc8 20. g3 Qc7 21. h5 Qxa5 22. Rxa5 ⩲ (+0.27 @ 37 ply, Stockfish 8) gives Black a fighting chance.

Aug-12-18  cormier:


click for larger view

Analysis by Houdini 4: d 25 dpa done

1. + / = (0.26): 19...Nc8 20.Qc5 Nb6 21.Rb3 Rd7 22.a4 Qg5 23.Qc3 Rc8 24.a5 Nd5 25.Qc5 h4 26.Ka2 Ne7 27.Qb4 Qf4 28.Qc4 Qd6 29.Qa4 Rg8 30.c4 Qc7 31.Qa3 f5 32.Qb4 a6 33.Qc5 Qd6 34.Qxd6+ Rxd6 35.Rb6

2. + / - (1.33): 19...Kc7 20.c4 Qf5+ 21.Qxf5 exf5 22.c5 Nd5 23.Rxa7 Kb8 24.Ra4 h4 25.a3 Rhe8 26.Kc2 Rg8 27.Rd3 Rd7 28.Rb3 Re7 29.Kb1 Rd8 30.g3 Rh8 31.Bxd5 cxd5 32.gxh4 Rxh4 33.c6 Rf4 34.Rab4 Re1+ 35.Ka2

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