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Harald Schneider-Zinner vs Raymond S Kaufman
Olomouc Ave Kontakt Cup IMC (2007), rd 1, Aug-01
Bogo-Indian Defense: Nimzowitsch Variation (E11)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jul-22-15  Cybe: gofer: The start is all too obvious...

<27 ... Ne3>

28 Bf1 Nxf1
29 Any move Nf3+

What if "Any move" is 29. hg? White loses, of course, but it's not mate.

Jul-22-15  saturn2: @ Cybe:What if "Any move" is 29. hg? White loses, of course, but it's not mate.

Yes, but after 29...NxNd2 black is a full piece ahead.

By the way my variant B1 29 Kh1 Nh3 30 Rf1 Nf4 31 Bf3 e4xBf3 does not work becaucse the pawn e3 is still there. But as gofer proposed one can insert 29....Qh3+ then 30. Qxe3+ and the same idea works now.

Jul-22-15  whiteshark: Fine Tuesday combo.
Jul-22-15
Premium Chessgames Member
  moronovich: <whiteshark: Fine Tuesday combo.>

Especially taking into consideration that today is wednesday :)

I just wanted to be shure that you hit the weekend before it is over :)

Jul-22-15  OutOfSync: Where in the world is chrisowen??
Jul-22-15  wooden nickel: <Der Teufel steckt im Detail> meaning something like <the devil is in the detail>. This puzzle is time consuming because there are so many details to check out in different interesting alternative variations along the played move 27... Ne3! i.e.
27... Nf3+? didn't seem to lead to anything but maybe 27... Nf4?!


click for larger view

is weak due to 28.gxf4 (if 28.Bf1! then 28... Qg4! and Black is winning).

27... e3!
<Phony Benoni: Well, that was simple. I was looking at 27...e3 28.hxg5 exf2+ 29.Kxf2 Qh2+ 30.Kf3> I liked that also! ... 28.Rf1 doesn't save White either


click for larger view

after 27... e3 28.Rf1 exf2+ 29.Rxf2, then Qxg3+!

Jul-22-15  stacase: Sometimes it just jumps out at you.
Jul-22-15  morfishine: What's interesting is <e3> is the key, whether playing 27...e3 or 27...Ne3
Jul-22-15  CHESSTTCAMPS: Black has a knight for bishop with other material even. White has spent time and resources to control the open a-file, while black has put together a deadly invasion of the white castled position, which is badly weakened on the light squares. Q+N is generally strong in such positions, but Q+2Ns is overwhelming.

27... Ne3! both threatens 28... Qg2# and prevents 28.Bf1 from repulsing the queen. White is done:

A) 28.Bf1 Nxf1 29.Rxf1 (Nxf1 Nf3#) Nf3+ 30.Nxf3 exf3 followed by 31... Qxg2#

B) 28.fxe3 Qxg3+ 29.Kh1 (Kf1 Nh3 and the mate threats Qf2# and Qg1# can't both be parried) Qxh4+ 30.Kg2 Qh3+ 31.Kf2 (Kg1 Qxe3+ 32.Kf1 Nh3 33.Kg2 Nf4+ followed by Qxe2 leads to mate soon) Qh2+ 32.Ke1 (Ke3 Qf4#) Qg3+ 33.Kf1 Nh3 and mate next.

Time for review....

Jul-22-15  CHESSTTCAMPS: Nice work from the son of Larry Kaufman. Larry was not only a World Senior Champion, but is an expert in many games, and is still a force to be reckoned with in weekend Swiss tournament chess.
Jul-22-15  CHESSTTCAMPS: 32.Ke3 is not available in my note B - I had my wires crossed with the line where black picks up the e-pawn with check.
Jul-22-15  mel gibson: I chose 27....e3 which still wins anyway
according to DR4 64 bit.
Jul-22-15  davidseven: Why not, Ne3 Bf1 Nxf1 hxg5 Nxg3 fxg3 Qxg3 Kh1... Still ends in check, but mistakes are always possible!
Jul-22-15
Premium Chessgames Member
  kevin86: White seems destined to be mated by a knight and queen. He takes out one knight, but the other did the trick.
Jul-22-15  saturn2: After 27...e3 28 Nf1 covers g3 and h2.
Jul-22-15
Premium Chessgames Member
  Penguincw: Came close to solving this Wednesday puzzle. I got 27...Ne3 28.fxe3 Qxg3+ 29.K moves, but at that point, the board got too blurry for me in my mind.
Jul-22-15
Premium Chessgames Member
  thegoodanarchist: This is such a famous game that surely everyone knows this combination immediately. :)
Jul-22-15
Premium Chessgames Member
  scormus: <morfishine: What's interesting is <e3> is the key, whether playing 27...e3 or 27...Ne3>

Good observation. I've come to realise that the best way to solve these puzzles is to spot the key weaknesses in the other player's positon, and concentrate your attack there. And of course the same applies when you are playing. Unfortunately it is often not easy to do in a game .....

Jul-22-15
Premium Chessgames Member
  patzer2: Here's my look at the game and today's Wednesday puzzle position (27...?) with the chessgames.com Opening Explorer (OE) and Deep Fritz 14x64:

<1. d4 Nf6 2. Nf3 e6 3. c4 Bb4+ 4. Bd2 Qe7 5. g3 Nc6 6. Bg2> The most popular move according to the OE is 6. Nc3 as in M Al Sayed vs Bologan, 2014.

<6... Bxd2+ 7. Nbxd2 O-O 8. O-O d6 9. e4 e5 10. d5 Nb8 11. b4> This is the second most popular move here (36 games in the OE ).

The most popular move (85 games in the OE) and my preference here is 11. Ne1 as in W So vs Y Kuzubov, 2009.

<11... Bg4 12. Qc2 a5 13. a3 Na6 14. Qc3 axb4> With this move the game enters previously unexplored territory, where Fritz assesses the position as fully equal.

<15. axb4 Bxf3 16. Bxf3 c5 17. dxc6 bxc6 18. Ra5> Fritz rates this about equal. However, I think White can do better with 18. Be2! when play mightcontinue 18... Qb7 19. Rfb1 Rad8!

[Not 19... Rfb8? 20. c5 dxc5? (20... d5 21. Bxa6 Rxa6 22. Rxa6 Qxa6 23. exd5 Nxd5 24. Qxe5 ) 21. bxc5 Qc7 22. Rxb8+ Qxb8 23. Bxa6 ]

20. c5 Nc7 21. cxd6 Rxd6 22. Nc4 Re6 23. Na5 Qb6 24. Qc2 Nb5 25. Bxb5 cxb5 26. Rd1 h5 27. Nb3 Rd6 28. Nc5 Rfd8 29. Qe2 Qc6 30. h4 Rxd1+ 31. Rxd1 Rxd1+ 32. Qxd1 Nxe4 33. Qf3 f5 34. Nxe4 Qxe4 35. Qxh5 Qxb4 36. Qe8+ Qf8 37. Qxb5 =.

<18... Nc7! 19. Nb3 Ne6 20. Rd1?!> This appears to be a slight mistake which allows Black to steal the initiative and secure an advantage.

Instead of 20. Rd1?!, White should play 20. c5 dxc5 21. Nxc5 Nd4 22. Kg2 Nb5 23. Qc4 =.

<20... Rad8 21. Kg2 Ng5 22. c5 d5 23. Nd2?> This is a mistake which loses immediately.

In order to maintain drawing chances, White needs to play 23. exd5 when play might continue 23...e4 24. Be2 Nxd5 25. Qc4 Qd7 26. Nd4 Qh3+ 27. Kh1 Nf6 28. Raa1 Ng4 29. Bxg4 Qxg4 30. Qe2 Qh3 31. f4 exf3 32. Nxf3 Qg4 33. Rxd8 Rxd8 34. Rf1 Ne6 35. Qe1 Rb8 36. Ne5 Qxb4 37. Qxb4 Rxb4 38. Nxf7 Rc4 39. Nd6 Rxc5 (-0.39 @ 22 depth, Deep Fritz 14).

<23... dxe4 24. Be2 Nd5!?> This gives Black a strong advantage (-1.26 @ 20 depth, Deep Fritz 14).

However Black has a stronger move available in 24... Qe6! when play might continue 25. Nf1 Qh3+ 26. Kg1 Nd5 27. Qc4 Nf3+ 28. Kh1 Qf5 29. Rda1 Nd4 30. Kg2 Qe6 31. Ra7 Rb8 32. Ne3 Nxe3+ 33. fxe3 Qxc4 34. Bxc4 Nc2 35. Rc1 Nxe3+ 36. Kf2 Ng4+ 37. Kg1 Rxb4 38. Rc7 Ne3 39. Ba6 Rfb8 40. Rxc6 Kf8 41. Rc8+ Rxc8 42. Bxc8 Ke7 43. c6 Kd8 44. Kf2 Nd5 45. Bf5 g6 (-2.98 @ 20 depth, Deep Fritz 14).

<25. Qa1> White can put up more resistance with 25. Qa3 but Black still wins after 25...Qe6 26. h4 Nf4+ 27. gxf4 Rd3 28. Bxd3 Qh3+ 29. Kg1 Qg4+ 30. Kf1 Qxd1+ 31. Kg2 Qg4+ 32. Kf1 Nh3 33. Nxe4 Qd1+ 34. Kg2 Nxf4+ 35. Kh2 Qf3 36. Bf1 Qxe4 37. Ra8 Ne6 (-2.14 @ 20 depth, Deep Fritz 14).

<25... Qe6!> (-2.54 @ 20 depth, Deep Fritz 14). Here after 25...Qe6! Black is clearly winning.

<26. h4 Qh3+ 27. Kg1 Ne3> This follow-up to the strong 24...Nd5!? and the clear winning 25...Qe6! solves today's Wednesday puzzle.

<28. fxe3 Qxg3+ 29. Kf1>

If 29. Kh1 Black wins easily after 29...Qxh4+ 30. Kg1 Qg3+ 31.Kh1

[31. Kf1 Nh3 32. Nxe4 (32. Bh5 Qf2#) 32...Qg1#]

31... Nf3 32. Nxf3 exf3 33. Bxf3 Qxf3+ 34. Kh2 Rxd1 35. Qxd1 Qxd1 (mate-in 19 to follow, Deep Fritz 14).

<29... Nh3 0-1> White resigns in lieu of 30. Nxe4 Qg1#.

Jul-22-15  whiteshark: <moronovich> Uhh, thanks, now I'll have to blame my wall calendar! ;)
Jul-22-15  Alex56171: Analysis by Stockfish 100415 64 BMI2 (depth=59) after 27... Ne3:

1. (-#17): 28.Bf1 Nxf1 29.hxg5 Nxd2 30.Rxd2 Rxd2 31.Ra8 e3 32.Rxf8+ Kxf8 33.Qa8+ Ke7 34.Qb7+ Rd7 35.Qxd7+ Kxd7 36.fxe3 Qxg3+ 37.Kf1 Qxe3 38.b5 e4 39.g6 Qf3+ 40.Kg1 e3 41.Kh2 e2 42.gxf7 e1Q 43.f8N+ Kc8 44.bxc6 Qeg3#

2. (-#15): 28.fxe3 Qxg3+ 29.Kh1 Qxh4+ 30.Kg1 Qg3+ 31.Kh1 Qh3+ 32.Kg1 Qxe3+ 33.Kh1 Qxe2 34.Ra3 e3 35.Rxe3 Qxe3 36.Nf1 Qh3+ 37.Kg1 Qg4+ 38.Kh1 Nf3 39.Nh2 Qh3 40.Rd2 Rxd2 41.Qg1 Rxh2+ 42.Qxh2 Qxh2#

Jul-23-15  Rookiepawn: <patzer2

Instead of 20. Rd1?!, White should play 20. c5 dxc5 21. Nxc5 Nd4 22. Kg2 Nb5 23. Qc4 =.>

I also frowned at 20. Rd1 (seems I'm improving). But isn't 20. Rfa1 worth a try?

Jul-23-15
Premium Chessgames Member
  patzer2: <Rookiepawn> I think 20. Rfa1 = is OK. It's what I would have played OTB.

However, Fritz ever so slightly prefers 20. c5 =.

My computer analysis for 20. Rfa1 goes 20. Rfa1 Rxa5 21. Rxa5 Rb8 22. c5 Ng5 23. Bg2 g6 24. Qc4 Qd7 25. Ra1 Nfxe4 26. cxd6 Nxd6 27. Qc5 Rb5 28. Bxc6 Rxc5 29. Bxd7 Rc4 30. b5 Rc2 31. Rc1 Rb2 32. Rc3 Rb1+ 33. Kg2 Nge4 = (-0.18 @ 23 depth, Deep Fritz 14).

Jul-23-15
Premium Chessgames Member
  patzer2: <Alex56171> Thanks for the deep analysis of 27...Ne3 with Stockfish @ 59 depth.
Jul-23-15  Rookiepawn: <patzer2> Thanks for the help to a Fritzgnoramus, I'm playing the line you gave OMyB now :)
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