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Gregory Kaidanov vs John William Donaldson
USA (1992)
Slav Defense: Exchange Variation (D10)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Feb-06-11  gofer: No Glory. Just Death!!! Oh well at least I get to live to play again...
Feb-06-11  gofer: I think 19 e7 is the crutial bit that I missed today. If black moves the rook then he is dead. If he accepts the loss (as crafty EGT does and simply plays h6) then the position is far from over. This is why e7 must be played before the Bxh7+ sac...
Feb-06-11
Premium Chessgames Member
  OhioChessFan: <OCF: 21. Qc2 Bishop moves 22. Qc3 and there's no hope for Black's Knight.>

<JFP: After 21..Bd7 22 Qc3, 22...f6 protects the knight.>

23. Qb4+ Kg8 24. Qb3
Now the Knight and the Pawn are pinned. Black's position is hopeless.


click for larger view

eg 24..Qb7 25. Bxe5 fxe5 26. Be4 Be6 27. Bxd5 Bxd5 28. Rxd5


click for larger view

And both Black central Pawns will be back in the box soon.

Feb-06-11
Premium Chessgames Member
  OhioChessFan: <Anatoly: <Jimfromprovidence> is correct. In the line 19...g6 20.exf8=Q+ Kxf8 21.Qc2 Bd7 does not promise more than two pawns. For example- 22.Qc3 f6 23.Be4 dxe4 24.Rxd7 Ra7 25.Rxa7 Qxa7 26.Bxe5 fxe5 27.Qxe5 and White will notch the other e-pawn soon enough.

Damn. I cannot find a pretty win.>

Ahead a d and e Pawn is a win.

Feb-06-11
Premium Chessgames Member
  OhioChessFan: I might like 23. Be4 in <Anatoly> line better. Both end up the same place, with Black's central Pawns indefensible.
Feb-06-11  Eurotrash: Easiest Sunday puzzle ever.
Feb-06-11  David2009: Kaidanov vs J Donaldson, 1992 postscript: After reading the kibitzes, I tried out <OhioChessFan>'s suggestion <21.Qc2> in reply to 20...h6 and duly won a Pawn against Craft EGT with the sequence 16.Nxd5 exd5 17.e6 Nde5 18.Rxc6 Bxc6 19.e7 h6 20.exf8Q+ Kxf8 21.Qc2 Be8 22.Qb3 f6 23.Qxd5 Ra7 24.Bxe5 Qxe5 25.Qxe5 fxe5 26.Kf1 Bf7 27.b3 a5 28.Bc4 (28. Bb5 does not work: after Rc7 Black attacks the B which cannot be supported, so I have to accept a weakening of my Pawns: Crafty is very forgiving and lets me start over whenever I want) Bxc4+ 29.bxc4 Rc7 30.Rc1 Rc6 31.Ke2 Ke7 to leave (White, 32?)


click for larger view

I struggled to make progress in this position. There are a number of draws by repetition (and also over-ambitious losing sequences for White) but I finally found a temporary Pawn sacrifice: 32.Rc2 e4 33.f4 b5 34.Kd1! Rxc4 35.Rxc4 bxc4 36.Kc2 Kd6 37.Kc3 Kc5 38.g4 g5 39.f5 a4 40.a3 1-0. If Black plays 34...bxc4 I have 35 Rd2 cutting off the Black King and peparing to round up the Pawn on c4. Nevertheless, this gives Black better chances IMO, though I have not tried to defend the position coulours-reversed against the EGT to see if I can draw it.

<OhioChessFan: 21. Qc2 is just as easy a win against h6 as g6> Change that to 'difficult' :)

The Crafty link is given in my earlier post (referenced above). There may be better moves for both sides in this sequence.

Feb-06-11  alachabre: David, feeling free to make use of my available resources in the post-mortem line 19...h6 ... 21.Qc2, both SOS and Ruffian recommend 22.Be2 instead of 22.Qb3. They also "think" 21...Bd7 is better than 21...Be8, but still give White significant advantage (almost two points). From a human point of view, I like keeping the Queen on the board as White in this position.
Feb-06-11  Old Wolf: To the people saying it was easy - did they see e7 from the problem position?

The move order has to be exact and any other sequence actually loses. Just wading in with the sacrifices is no good.

Feb-06-11  Old Wolf: I'm wondering how an IM can play such a horrible move as 6..e6 in the opening? It shows such a lack of positional understanding. Black's position out of the opening is cramped and passive and I don't know why anybody would knowingly go for that.
Feb-06-11  wals: Not even close.

Rybka 4 x 64

Blunder

Black
d 18 : 8 min :
15...Qb8, +1.67. Best,

1. (-0.26): 15...Kh8 16.b4 Ndxe5 17.b5 Nxd3 18.Qxd3 axb5 19.Qxb5 f6 20.Rb1 Ra6 21.Na4 Ne5 22.Bxe5 fxe5 23.Rb2 d4 24.f4 Ra5 25.Qb4 b5 26.Nb6 Ra7

2. = (0.22): 15...Re8 16.Qg4 Ndxe5 17.Bxh7+ Kxh7 18.Qh5+ Kg8 19.Bxe5 Nxe5 20.Qxe5 Rc8 21.Rd4 b5 22.Rg4 f6 23.Qh5 Rc4 24.Rxc4 bxc4 25.b3 Qb8 26.bxc4 dxc4 27.Rb1 Re7

Black
d 20 : 7 min :
19...Re8, +3.05. Best,

1. (1.67): 19...g6 20.exf8Q+ Kxf8 21.Qc2 Bb7 22.Qc3 f6 23.Qb4+ Kf7 24.Qxb6 Bc6 25.Qd4 Qd6 26.Rc1 Bb5 27.Be4 Rd8 28.Rd1 Bc6

2. (1.67): 19...h6 20.exf8Q+

Black
d 15 : 3 min :
22...Qc8, +#10.
1. (#10): 23.Bxg7 Qxh3 24.gxh3 f6 25.Bxf6[] Rxe7 26.Bxe7 Be8 27.Qg5+ Kf7 28.Rxd5 b5 29.Qf6+ Kg8 30.Rg5+ Bg6 31.Rxg6+ Kh7 32.Qg7#

Black resigned move 24.

Feb-06-11  wals: <pmukerji>if 23...Kxg7,

Analysis by Rybka 4 x64:
d 17 : 3 min :

1. (#6): 24.Qg5+ Kh8 25.Rd4 Qf5 26.Qxf5 Rxe7 27.Rh4+ Kg7 28.Qg5+ Kf8 29.Rh8#

Feb-06-11
Premium Chessgames Member
  Check It Out: 15...Qb8 appears to allow a whole string of smashing moves that obliterate black's position: 16.Nxd5, 17.e6, 18.Rxc6, 20.Bxh7, 23.Bxg7 (and the hits just keep on coming!)

Nice attacking game.

Feb-06-11  stst: 21:17, but Black may not have the fate as Steelers.

Yet after 20.BxP+, Black need not take this B,..Kh8, then the most fierce White could do is 21.Qh5 Pg6, 22.BxP (dis.cl.+) Kg7, 23.Qh7+ Kf6, 24.BxP RxP and White does not have immediate mating net ==> Black can at least extend the game (No time limit like the XLV game!)

... Suggestion: new to Kibitz, late, but like to have a prize-enticing puzzle corner... postpone the solution to at least the next day to create some anxiety and excitement. May accumulate points and award those who answered quick and right. Yet how can we guard off friends with engines (Fritz, Rybka, etc.?)

Thanks, stst

Feb-06-11  stst: good site, but suggest to update your Kibitz corner so that latest kibitz comments can be seen right here below the game.

Thanks!!

Feb-06-11  rapidcitychess: <stst> In you preferences, you can switch it to that mode.
Feb-06-11
Premium Chessgames Member
  Phony Benoni: <stst> Click the "preferences" link. In the section "Configure website behavior", click the button labelled "Display newest kibitzes on top", then save your changes.
Feb-06-11  bubuli55: Category insane gave this puzzle away. Nxd5 is the only insane move. e6 is a logical continuation. Then Bxh7 is playable only after Rxc6. The fact that this is a puzzle within a puzzle I assume makes it insane.
Feb-06-11  DarthStapler: I got the first two moves
Feb-06-11  M.Hassan: "Insane" White to play 16.?
Materials are even.
I did the following line:

16.Nxd5 exd5
17.Bxh7+ Kxh7
18.Qh5+ Kg8
19.Rxd6 Ncxe5
20.Rxd7 f6 <if 20...Nxd7 21.Bxb8> 21.Bxe5 Qxe5
22.Qxe5 fxe5
23.Rxb7
White is up by 2 pawns and may win!
Time to check
---------------
Not Quite. Looking forward for tomorrow night

Feb-06-11  sevenseaman: Solvers who got merely the first move, 16.Nxd5 should be quite satisfied. This is the only 'insane' part of the puzzle, the rest flows.
Feb-06-11  EXIDE: With 19 ..,h6, the best I could achieve was a draw. A difficult position to analyze over the board, way above my capabilities.
Feb-07-11  Patriot: I saw this just a few minutes before midnight and guessed 16.Nxd5 after I saw that 16.Bxh7+ fails. I never worked it out except 16...exd5 17.e6 but didn't think about 17...Nde5 in that short time. This isn't exactly solving it.
Feb-07-11
Premium Chessgames Member
  patzer2: A winning line against <crafty> in <David2009>'s posted link is 16. Nxd5!! exd5 17. e6 Nde5 18. Rxc6 Bxc6 19. e7 h6 20. exf8=Q+ Kxf8 21. Qc2 Be8 22. Be2 f6 23. Rxd5 Qb7 24. Rd6! Rc8 25. Qh7 Nf7 26. Bh5! Bc6 27. Re6 Rd8


click for larger view

28. Be5!! fxe5 29. Rg6 Bd5 30. Rxg7 Rb8 31. Qg8+ Ke7 32. Rxf7+ Bxf7 33. Qxf7+ Kd6 34. Qf6+ Kd7 35. Bg4+ Ke8 36. Qxe5+ Kf7 37. Bf3 Qa7 38. Bd5+ Kg6 39. Be4+ Kf7 40. Qh5+ Kg8 41. Qxh6 Rb7 42. Bd5+ Rf7 43. Qg6+ Kf8 44. Qxf7+ Qxf7 45. Bxf7 .

Feb-07-11  bubuli55: Old Wolf. 6...e6 is not bad compared to 15...Qb8
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