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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


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

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Kibitzer's Corner
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Jul-28-10  goodevans: <azax: Looking through the game, 27. ? could be a Friday puzzle. I would be proud to find that Knight sac.>

I agree. I've just been looking at that move, and if black has a better defence I can't find it.

One quite nice line is <27 Nxe5 Qc7 28 Qh7+ Kf8 29 Nxg6+ Ke8 30 Qg8+> and mate in 2.

Jul-28-10  goodevans: Another nice line is <27 Nxe5 Qe8 28 Qh7+ Kf8 29 Nxg6+ fxg6 30 Nf5> and black's position completely crumbles.
Jul-28-10  Ferro: 29.Ba3+ Bd6
30.Bxd6+ Qxd6
31.Nf5 Nf4+
32.Kd1 Rc1+
33.Kxc1+ Ne2+
34.Kb1 Nc3+
35.dxc3 1-0
Jul-28-10  Ferro: NO!
29.Ba3+ Bd6
30.Bxd6+ Qxd6
31.Nf5 Nf4+
32.Kd1 Rc1+
33.Kxc1+ Ne2+
34.Kb1 Nc3+
35.dxc3 NOOOOOO Qh2
Premium Chessgames Member
  agb2002: White has a bishop and a pawn for the bishop pair.

Every White piece can take part in the attack against the black king (the bishop from a3 and the knight from f5).

Black would try to get some counter chances with ... Bxd4 and ... Qg4+, or ... b4 and ... a5, closing White's bishop diagonal and opening another for his LSB, or fly with the king to the queen side. Hence, 29.Ba3+:

A) 29... Ke8 30.Qh8+ Nxh8 (30... Nf8 31.Qxf8#) 31.Rxh8#.

B) 29... Ne7 30.Qh8#.

C) 29... Bd6 30.Bxd6+ (30.Nf5 Qxf5 31.Bxd6+ Ke8 - + [N vs P]) Qxd6 (otherwise as A or B) 31.Nf5

C.1) 31... Q<anywhere but h2> 32.Qh8+ Nxh8 33.Rxh8#.

C.2) 31... Ke8 32.Nxd6+ Kd7 33.Nxb7 + - [Q+P].

D) 29... b4 30.Bxb4+ just delays the defeat one move.

Jul-28-10  Ferro: 29.Ba3+ Bd6
30.Bxd6+ Qxd6
31.Nf5 Nf4+
32.Kd1 Rc1+
33.Kxc1+ Ne2+
34.Kb1 Nc3+
35.dxc3 NOOOOOO Qh2
36.Qh1 Qxh1 CHECK
Jul-28-10  Rook e2: This puzzle was not that hard, it took me a while to find the right order tho. A puzzle after 26.. Ng6 white to play would be a little harder, maybe saturday I think.
Jul-28-10  TheBish: K Bischoff vs R Buhmann, 2008

White to play (29.?) "Medium/Easy"

This one looks slightly familiar. White is down a piece (for a pawn), so there should either be a mating attack or a significant gain of material (like a queen for a minor piece). I noticed that if White could control the e7 square (like by a bishop check), there would follow a quick mate by Qh8+ or maybe Qg8+ if the king moves.

29. Ba3+! Bd6

Obviously, 29...b4 only delays things (like a computer would do), 29...Ne7 is an easy mate (Qh8#) and 29...Ke8 allows a mate in two starting with either 30. Qg8+ or 30. Qh8+.

30. Bxd6 Qxd6 31. Nf5

Our goal of controlling e7 has been accomplished, and after the necessary move of the black queen, White would follow with 32. Qh8+ Nxh8 33. Rxh8#, but Black has one last trick to try...

31...Nf4+ 32. Kd1

Or simply 32. exf4 Qe6+ 33. Kd1 Ke8 34. Nxg7+ wins the queen; White needs only to avoid 32. Ke1?? or 32. Kf1?? Rc1#. Now Black should resign, as mate or loss of the queen is unavoidable.

Jul-28-10  TrollKing: 29. Ba3+ Bd6
30. Bxd6+ Qxd6
31. Nf5

Hitting the black Queen and the flight
square e7. Mate in 2 is threatened (
Qh8) as is the black Queen.

Jul-28-10  zb2cr: Found this one pretty quickly. I have nothing to add to the trenchant comments from <zooter>, <azax>, <OBIT>, <CHESSTTCAMPS>, <dzechiel>, <Eduardo Leon>, <Nullfidian>, <Once>, <TheaN>, and <agb2002>.
Jul-28-10  krakukas: Got it, 3/3. It took much longer than the previous one, however. Luckily, no need to use my secret weapon (a pencil) yet. Starting with Saturday, a pencil is a must for me to keep my thoughts in order.
Premium Chessgames Member
  gawain: All I see is 29 Ba3+ to be followed up with Nf5.

Apparently that is good enough!

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 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
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.
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.
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#).

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.
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