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

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 5 OF 5 ·  Later Kibitzing>
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


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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
Jan-28-23  jrredfield: Missed this one. I considered 18 Bxh7, 18 exf7+ and 18 e7, all of which basically lead to a drawish position. I never considered 18 Rxc6. Now I see that removing the Black N is key to increasing the White pawn threat on the e file.

Komodo Dragon gives a score of +4 95 for the text move.

Depth 42: 18 Rxc6 Bxc6 19 e7 Qe8 20 exf8Q+ Kxf8 21 Bxh7 Qe6 22 Qh5 Ng6 23 Rd4 Bb7 24 Bg3 Rc8 25 Rg4 Ne7 26 Bd3 Qh6 27 Qe5 Qf6 28 Kh2 b5 29 Qxf6 gxf6 30 Bd6 Ke8 31 Bb4 Rc1 32 h4 Bc8 33 Rg7 Rc6 34 Bxe7 Kxe7 35 Rg8 f5 36 h5 Bd7 37 Rh8 Rd6 38 h6 d4 39 exd4 Rxd4 40 h7 Rh4+ 41 Kg3 Rg4+ 42 Kf3 Rh4 43 g3 Rh2 44 Kf4 Rxf2+ 45 Kg5 Rh2 46 Bxf5 f6+ 47 Kg6 Bxf5+ 48 Kxf5 Kf7

Jan-28-23  Brenin: White's Q and B are lined up for the classic Bxh7+ and Qh5+ attack, but some preliminary softening up of Black's defence is required, so first 18 Rxc6 Bxc6 19 e7, and if the natural-looking 19 ... Re8 is played then 20 Bxh7+ works like a dream, with the R on d1 ready to join in via d4. Of course, this is just the second act of a drama which started with a N sac 16 Nxd5.
Jan-28-23
Premium Chessgames Member
  PawnSac: < Brenin: Of course, this is just the second act of a drama which started with a N sac 16 Nxd5. >

Yes, that is the clever move. I would have started the puzzle at 16._?__ white to move. It induces the self pin of the Nd7-e5. After that, the pin makes Rxc6, Bxh7, Qh5+ obvious. one only has to figure out the intermezzo details. Nice play by Gregory tho.

Jan-28-23  mel gibson: I didn't see that.
Stockfish 15 says:

18. Rxc6

(18. Rxc6 (♖c1xc6 ♗b7xc6 e6-e7 ♕b8-e8 e7xf8♖+ ♔g8xf8 ♗d3xh7 ♕e8-e6 ♕e2-h5 ♘e5-g6 ♗f4-c7 ♗c6-b7 ♗h7xg6 f7xg6 ♕h5-f3+ ♔f8-g8 ♖d1-d4 ♖a8-f8 ♕f3-g3 ♖f8-f5 ♖d4-b4 b6-b5 ♖b4-g4 ♔g8-h7 ♗c7-a5 ♗b7-c8 ♗a5-c3 ♕e6-f7 ♕g3-b8 ♕f7-d7 ♖g4-d4 ♖f5-h5 ♖d4-f4 ♖h5-f5 ♖f4-g4 ♖f5-h5 ♖g4-d4 ♗c8-b7 a2-a3 ♖h5-f5 f2-f3 ♕d7-e7 ♔g1-f2 ♕e7-d7 ♖d4-h4+ ♖f5-h5 ♖h4-f4 ♖h5-f5 ♖f4-d4 ♗b7-c6 ♖d4-g4 ♖f5-h5 ♕b8-g3 ♕d7-e6 ♕g3-c7 ♗c6-d7 ♖g4-d4 ♖h5-f5 e3-e4 ♖f5-h5 ♔f2-g1 ♕e6-f7 ♖d4-d2 ♕f7-e6 ♕c7-a7 ♕e6-f7 ♔g1-f2 ♕f7-e7 ♖d2xd5 ♕e7-h4+ ♔f2-g1 ♖h5xd5 e4xd5) +5.54/48 262)

score for White +5.54 depth 48.

Jan-28-23  Mayankk: I was distracted by 18 Bxh7+ Kxh7 19 Qh5+ Kg8 20 Rxd5 fxe6 21 Rxe5 Nxe5 22 Bxe5. Although it looks forceful with a Rook on an open c file, a centralised Bishop at e5 and Queen on the open h file, White doesn't seem to make much progress from here. Rc7 is countered by Rf7 which also defends against an assault on the weak g pawn.

The key was to let go of the beautiful Rook on the open c file at the beginning itself and then let the King and f8 Rook stay locked by not allowing fxe6 and instead march e7 forward first. All looks logical in hindsight but difficult to conceive at the start. And to think White saw it all even earlier at 16 Nxd5...

Jan-28-23
Premium Chessgames Member
  An Englishman: Good Evening: Rather amusing--the whole point of the combination consists of getting Black (and White!) pieces out of the way so that the sleepy Rd1 can enter the game. For example, 23...Kxg7; 24.Qg5+,K-any; 25.Rd4 and 26.Rh4 will let that lazy castle steal all the credit for the win. Or in the game, after 24.Bxf6, only disastrous material losses might prevent 25.Qg6+ and 26.Rd4-h4.
Jan-28-23  outplayer: Que Gregory Kaidanov perigoso do cacete.
Jan-28-23
Premium Chessgames Member
  Teyss: <Brenin: Of course, this is just the second act of a drama which started with a N sac 16 Nxd5.> Well spotted, 16.? was indeed a Sunday puzzle in 2011. Black's previous move 15...Qb8? was a mistake allowing 17.e6 attacking Q and N, so Black cannot play fxe6.
Jan-28-23
Premium Chessgames Member
  thegoodanarchist: 19.e7 shows class.
Jan-28-23
Premium Chessgames Member
  Messiah: <Zug jah> like in one of these legendary East German porn movies?
Jan-28-23  Chesschronicle22: Yo what??
Jan-28-23
Premium Chessgames Member
  agb2002: White has a bishop and a pawn for both knights.

The first idea that comes to mind is 18.Rxc6 Bxc6 19.Bxh7+ Kxh7 20.Qh5+ Kg8 21.Bxe5 Qb7 22.Bxg7 Kxg7 23.Qg5+ Kh8 24.Qf6+ Kg8 25.Rd4 Rfb8 26.e7. However, Black has 21... Qd8, controlling g5. This suggests 18.Rxc6 Bxc6 19.e7:

A) 19... Re8 20.Bxh7+ Kxh7 (20... Kh8 21.Qh5 g6 22.Bxe5+ Qxe5 23.Qxe5+ Kxh7 24.Rd4 wins) 21.Qh5+ Kg8 22.Bxe5 Qb7 23.Bxg7

A.1) 23... Kxg7 24.Qg5+ Kh8(7) 25.Rd4 and 26.Rh4#.

A.2) 23... f6 24.Qg6 Rxe7 25.Bxf6+ Kf8 (25... Rg7 26.Bxg7 Qg7 27.Qxc6 wins three pawns) 26.Bxe7+ (26.Rd4 is interesting) 26... Kxe7 (26... Qg7 27.Qxc6) 27.Rd4 with three pawns for the bishop and the iniciative.

A.3) 23... f5 24.Qg6 (24.Bf8 Rxf8 25.Qg6+ Kh8 26.Rd4 f4) 24... Rxe7 25.Bc3+ Kf8 26.Rd4

A.3.a) 26... Re8 27.Bb4+ Re7 28.Rh4 wins.

A.3.b) 26... a5 27.Rh4 Rf7 28.Bf6 Rxf6 29.Qxf6+ and mate soon.

B) 19... Rc8 20.Bxh7+ is similar to A.

C) 19... h6 20.exf8+ Kxf8 21.Bxa6 seems to win a pawn.

Jan-28-23  vajeer: I chose 19...g6 as defense. White gets a better position and a pawn up. But some way off from victory perhaps?
Jan-28-23
Premium Chessgames Member
  perfidious: Typically dull game from the Slav Exchange. (laughs)
Jan-28-23  King.Arthur.Brazil: I begin my thoughts with 18. Bxh7+ Kxh7 19. exf7 (which threats Qh5# or Rxd5), but the simple 19... g6 seems to stop everything.

Then I realized that Black N is pinned by his Q, which make's me see the combination: 18. Rxc6 Bxc6 19. e7 Re8 20. Bxh7+ Kxh7 21. Qh5+ Kg8 22. Bxe5. Then Qc7 or Qb7.

Here I really didn't pay much attention, because I saw one ♖ less, no immediate mate move. Therefore, I must agree that 23. Bxg7! is hard to see at the beginning of the combination (move 18). Now, it is clear that 23... Kxg7 24. Qg5+ Kh7 25. Rd4 with following check mate. Great!

The King also believe that would be very surreal that Back could play 19... g6. E.g. 20. exf8=Q+ Kxf21. Bh6+ Kg8 22. f4 Nxd3 23. Qxd3 f6... Not 22. Bxa6? b5. 22. Bb1 Qe8. I don't realize if there is a better line for White, but Black still has a game to fight.

Jan-28-23  King.Arthur.Brazil: After: 24...Rxe7 25. Qh8+ Kf7 26. Qg7+ Ke6 27. Qxe7+ Kf5 28. g4+ Kg6 29. Qg7#
Jan-28-23
Premium Chessgames Member
  scormus: Respect for those who got this when it was 16. W to play! It's cute enough in today's guise.

18 Rxc6 isn't so difficult, but I didn't get 19 and 20 in the right order. 19 e7 g6 to me looked playable for B. So I thought it better for W to play 19 Bxh7+ Kxh7 20 Qh5+ before 21 e7, expecting ... Re8. What can possibly go wrong? What I missed was the unobtrusive 21 ... f6! which completely stops W in his tracks. No credit for me.

I agree with <thegoodanarchist> 19 e7 shows ..... bottle?

Jan-28-23  Refused: 18.Rxc6 is the natural move that jumps out. The pin of hte 45 knight and the threats against h7 mean, I will at the very least collect on e5 in some shape or form. Only question is what to do with the e-pawn. Capture on f7 looks kinda tempting at first, but forcing the rook on f7 to help with the defense of h7 feels wrong. leaving it on e6 or pushing it to e7 (having the black rook on f8 or not) is pretty much the only question here. I think not having the rook on the f-file might be helpful.

Anyway.

18.Rxc6 Bxc6 19.e7 Re8 (or c8?) 20.Bxh7+ Kxh7 21.Qh5+ Kg8 22.Bxe5 Qb7 23.Qg5 f6 24.Bxf6 Rxe7 25.Bxe7 +-

Ok, White went for the more brutal 23.Bxg7!! which is superior to my tamer Qg5 (which still wins, but just not as quick)

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