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Klaus Bischoff vs Rainer Buhmann
TCh-AUT 1st Bundesliga -9 (2008), St Veit AUT, rd 1
English Opening: Anglo-Slav Variation. General (A11)  ·  1-0
ANALYSIS [x]

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sac: 27.Nxe5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jul-28-10  BOSTER: Nothing unusual, you only have to see where all pieces are, and what are they doing. 29.Ba3+ Bd6 30.Bxd6+ Qxd6 31.Nf5 and game is over.(threat Qh8+ Nxh8 Rxh8#). <CG is the best chess learning community.> Reading <about our puzzles> you can see <it is updated every day at 12:00 am USA/Eastern time>. It means classes begin at 12:00am.
I guess that <CG> stuff are professional people, I'm sure they are, and they know 12:00 means 12:00. Last week I came in class,or using another words I opened chessgames.com exactly 12:00, and I was very surprised when I saw the same inf. what the day before. I had to wait about 25 min.before inf. was updated. I'm not very pretentious person, but I know that the punctuality means something even for Kings. And one more. How can you explain that such well-known and huge site like <CG> ( more than 500,000 games) has only about 50 students participating in this learning process
Jul-28-10
Premium Chessgames Member
  chrisowen: Wrecking ball 29.Ba3 cranes black's neck. These English e3 c4 systems are all if too common the rage. So when sometimes centre break dubois 25...e5 file down angle see concrete mate a coming. Perhaps not but clearing a path you wonder how long Rainer will persist. 29..Bd6 Bxd6+ Qxd6 Nf5 forge ahead and black employment a check Nf4 Kd1 languishes it in safe havens.
Jul-28-10  Patriot: It took me several minutes to see it, because the merits of 29.Ba3+ were not immediately obvious and there were other forcing moves to consider (and forget), since black could just play 29...Bd6 30.Bxd6+ Qxd6 and the black king has another escape square. I was hoping to figure out a way to leave the queen on d7. I really wanted to get the knight on f5 and looked at the line 29.Nf5 Qxf5 30.Ba3+ Ke8 31.Qg8+ Kd7 and it's a dead end. Then I put those ideas together: 29.Ba3+ Bd6 30.Bxd6+ Qxd6 and NOW 31.Nf5, threatening both 32.Nxd6 and 32.Qh8+ Nxh8 33.Rxh8#.

The sequence leading up to this point is interesting to see, starting with 25.Qg1 (threatening Q-g4-h5-h8#).

After 25...e5 26.Qh2 walks into a pin but is completely safe thanks to the mate threat.

26...Ng6, stopping the threat.

At this point, 27...exd4 is threatened and after the sequence 27.Qh7+ Kf8 the knight on d4 is trapped. So white most likely saw the whole sequence from at least the move, 26.Qh2.

27.Nxe5! Bxe5 28.Qh7+ and the rest is history.

Jul-28-10  OBIT: <BOSTER>I'm sure there are hundreds, if not thousands, participating in this "learning process." There may be only about 50 posting, but I guess the rest are just shy. :)

As for the 12:00 starting time, I'd say that's just for the students who want to be part of the group that tries to break down the position. Sometimes the game continuation does not tell the whole story, and that's when the analytic process can get interesting.

Jul-28-10  cuppajoe: Missed Nf4+, but got away with it today.
Jul-28-10
Premium Chessgames Member
  kevin86: The main idea was that black's king must be deprived of the escape square at e7-at all costs.

Black is left with a final choice;save the queen and get mated or lose the lady. Black tries a spite check to manoever a possible queen check. White doesn't bite and black strikes his colors.

Jul-28-10  SufferingBruin: Three for three, my brethren!

(But it was easy for so many... is it really worth bragging about?)

/moment of contemplation. Only a moment...

<THREE FOR THREE>, pardon the shouting.

Jul-28-10  Patriot: <BOSTER> <OBIT>

I'm not usually on "Chessgames" at 12 midnight, but whenever I was I repeatedly refreshed the screen and saw that the new puzzle would be posted within 3-5 minutes.

As to the 500,000 games on this site and 50 students, I don't see why there should be a logical correlation between them. It could be that much of the game database was either purchased or borrowed from a free site. Besides, a lot of people may solve the puzzle without posting anything while other's may use it as a reference for finding games and players.

Jul-28-10  David2009: K Bischoff vs R Buhmann, 2008 White 29?

29 Ba3 Bd6 30 Bxd6+ Qxd6 31 Nf5 with the double threat of NxQ and Qh8+ mating. Time to check:
=====
As expected, the regulars beat me to it. Puzzle position:


click for larger view

Jul-28-10  Marmot PFL: 29 Ba3+ Bd6 30 Bxd6+ Qxd6 31 Nf5 Qmoves 32 Qh8+ Nxh8 33 Rxh8 mate. This was tricky as there are several other tries that fail.
Jul-28-10
Premium Chessgames Member
  patzer2: As <YouRang> observes, Black's 25...e5? allowed White a brilliant attacking combination against the helpless King position after 26. Qh2!! Ng6 27. Nxe5! (also winning was 27. Qh7+! Kf8 28. Nxe5 ).

Instead of 25...e5?, perhaps 25...Ng6 26. Qg4! Kf8 27. Nh4 Nxh4 28. Rxh4 Ke7 29. g6 f6 30. Rh7 Rg8 would have given Black practical drawing chances in an inferior position.

Today's Wednesday puzzle solution, 29. Ba3+!, was of course set up by the combination beginning with 26. Qh2!! Following the forcing 29...Bd6 30. Bxd6+ Qxd6 31. Nf5 White springs a winning double attack, threateing both the Queen and mate-in-two (e.g. 31...Qd7 32. Qh8+ Nxh8 33. Rxh8#).

Jul-28-10
Premium Chessgames Member
  doubledrooks: I found the game continuation to the end.

Also, 27. Nxe5 was a great find by Bischoff.

Jul-28-10  cjgone: Took me a while to find. I played exf4 instead. Rybka says this is about the same as moving the king.
Jul-28-10  Ferro: En la Piramidal Augusta, Remember when i an older sugunt. La olivera twist older in de site august convent. La Alfil-Bishop success la older a3, Luego el Alfil August innove the persecution paracaidist, and Explote! in Emotion mis venas of love (de mujer).
Jul-28-10  Ferro: 27. Nxe5. Otra vez el tema Apasionado del Sacrificio. Hasta cuando os dareis cuenta? Mis ojos revientan a explotar junto a ti, lector!
Jul-28-10  Ferro: Mis ojos...
Jul-28-10  SufferingBruin: Y'all might find this overly fawning but I have to say it, publicly: if I could analyze chess like <patzer2>, I might never leave the damn house.
Jul-28-10  wals: Black's ruin was 25...e5 +4.97.
Alternatives:-

Analysis by Rybka 3 1-cpu:

1. (1.32): 25...a5 26.Qg4[] Ng6 27.Nh4 b4 28.Qh3 Kf8 29.Nxg6+ fxg6 30.Qh7 Qf7 31.Rh3 Ba6+ 32.d3 Ke7 33.Rf3 Qg8 34.Qxg6 Bb5 35.Nxb5 Rc2+ 36.Kd1 Rxb2

2. (1.32): 25...b4 26.Qg4[] Ng6 27.Nh4 a5 28.Qh3 Kf8 29.Nxg6+ fxg6 30.Qh7 Qf7 31.Rh3 Ba6+ 32.d3 Ke7 33.Rf3 Qg8 34.Qxg6 Bb5 35.Nxb5 Rc2+ 36.Kd1 Rxb2

3. (1.33): 25...Ng6 26.Qg4[] Kf8 27.Nh4 Nxh4 28.Rxh4 Ke7 29.Rh7 Rg8 30.Nf3 g6 31.Ne5 Bxe5 32.Bxe5 Ke8 33.Qb4 Bc8 34.Qc5 Bb7

4. (1.53): 25...Bc6 26.Nxc6 Qxc6[] 27.Bxg7 Ng6 28.Nd4 Qd7 29.Bf6 Kf8 30.Qg4 Ke8

and lost all chance with
26...Ng6 +10.30.

White gave some slack with
27.Nxe5 +5.27 (Qh7+ was the go)

Black however, determined to lose,
retaliated with, 27...Bxe5 +16.35.

Jul-28-10  rapidcitychess: That was a puzzle I almost missed, because of the Ba3 hitting f8. :)
Jul-28-10  BOSTER: <patzer2> <As <YouRang> observes Black 25...e5 allowed White a brilliant attacking combination>. Studing this game I want to notice,that in spite of many black's mistakes if they played 18... Re8 (instead Rc8- losing a tempo and helping white) this "crazy" attack beginning from move 9.g4 was not such successful.
Jul-28-10  donehung: To me not a 2 star puzzle, too many themes :deflection in conjunction with the double attack on top of parrying any of blacks checks...
Jul-28-10  turbo231: this puzzle puzzles me
Jul-28-10  Moonwalker: <<BOSTER>: How can you explain that such well-known and huge site like <CG> ( more than 500,000 games) has only about 50 students participating in this learning process>

Some of us sit quitely in the back row, extremely attentive on Monday, concentration wavering by Wednesday and, from Friday, revert to playing tic-tac-toe!

I must be getting better though, got today's except for considerations for the spite check 31. ... ♘f4+. Or rather stopped looking after concluding that there is no feasible defence against 31. ♘f5

Now if you'll excuse me, it's getting late in the week and I have lots of paper-planes to construct!

Jul-29-10  M.Hassan: I went to great lengths to solve it starting with 29.f4 but it just did not work out.Meaning could not solve it!!
Jul-29-10  njchess: Nice puzzle, though not too hard to see Ba3+.

I think Black's game begins to go awry as early as 5. ... e6. I've played the a6 Slav many times and one of the issues with an early e6 is that it commits Black's e-pawn to a square. e6 pretty much dooms Black to a closed position facing a kingside attack.

Nbd7 is more flexible since it gives Black the option of a later e5, or e6. This is particularly important since White has already played h3. As a result, Black's bishop will wind up on b7 after the b5 pawn thrust. Nbd7 can even lead to c5 as an attempt to open up the center.

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