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Alexey Dreev vs Eduardas Rozentalis
Vilnius (Lithuania) (1988)
Queen's Indian Defense: Kasparov-Petrosian. Classical Variation (E12)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jan-22-06
Premium Chessgames Member
  al wazir: I thought the Q sac was too obvious. I didn't even analyze it. Instead, I opted for 31. Bh5. My thinking was that this threatens 32. Bxg6 hxg6 33. Rxg6+ fxg6 34. Qxg6+ Kh8 35. Nf7#.

Black has three pieces he can use to defend and hence three alternatives on his 31st move: Bf8, Rf8 (Rg8 doesn't seem to accomplish anything), and Qd6.

A) 31...Bf8 32. Bxg6 Kh8 (32...hxg6 33. Rxg6+ Kh8 34. Nf7#) 33. Nxf7+ Kg7 34. Bh5+ Kh6 35. Qxh7+ Kxh7 36. Nf6#.

B) 31...Rf8 32. Bxg6 hxg6 33. Rxg6+ fxg6 34. Qxg6+ Kh8 35. Nxf8 Bxf8 36. Nf7+ Qxf7 37. Qxf7. White has a Q, N, and three Ps against two Bs and a R.

C) 31...Qd6 32. f6. Here it got too complicated for me to follow in my head, but I think the same ideas work here as in the other lines. It's clear that black can't block the file by playing g5.

So white wins in line A) and at worst comes out ahead in line B), but the attack may fail in line C).

Jan-22-06  soberknight: <A rare case in which the critical diagonal was b1-h7.> What's a "critical diagonal"? That diagonal is frequently the focus of a White attack against Black castled kingside, for example in the Bxh7 "Greek gift" sacrifices.
Jan-22-06  erimiro1: <soberknight>True indeed, so let me explain myself. In most cases, the white bishop is involved directly (with the help of the rook and/or the queen, with or without B:h7+ followed by Ng5+ etc. We all know them). Here, the white bishop is not aimed to h7, the target is not h7 at all and the dominant piece is the queen.
Jan-22-06  ice lemon tea: i like the finishing though i missed the blatant queen sac. quite easy for sunday puzzle yet very beautiful.
Jan-22-06  dakgootje: Didnt really look for the solution.
Jan-22-06  LIFE Master AJ: I looked at this one for nearly 5 minutes ... and did NOT even consider Qf5!!! (But did look at a ton of other things, however.)

Fantastic puzzle, a real stumper.

Jan-22-06  LIFE Master AJ: Like <al wazir> ... and probably a million other people, I got hung up on Bh5.
Jan-22-06  Fan of Leko: I look at all checks and captures but missed Qf5 since it was neither. Peter would see it of course assuming the game hadn't already been drawn.
Jan-22-06  independentthinker: Cool - I got it after about 2-3 mins. I used to avoid tactics and opt for positional moves, but I'm starting to see this combinatorial stuff much better of late.
Jan-22-06  EmperorAtahualpa: Beautiful puzzle! I was also thinking of 31.Bh5, but 31.Qf5!! is clearly better. There was a recent discussion on E M Jackson vs Marshall, 1899 whether the move 30...Rf4+ deserves one or two exclamation marks. People who believed 30...Rf4+ in that game deserved two exclamation marks, should have a look at this game. (and one of those people already did, I see now)

I have one more question: How does the game continue after 34.Qxd7 Bxd7 35. Bd3?

Jan-22-06
Premium Chessgames Member
  patzer2: Here's a look with Fritz 8 and the ChessGames.com Opening Explorer:

<1. d4 e6 2. c4 Nf6 3. Nf3 b6 4. Nc3 Bb7 5. a3 d5> This is the poplar reply, but a sharp alternative is 5...g6 as in N Vitiugov vs Shirov, 2006 or H Borchgrevink vs B Byklum, 2005 or G Gajewski vs Kiril Georgiev, 2005. <6. cxd5 exd5> The more popular reply is 6...Nxd5 as in I Sokolov vs Leko, 2006. <7. g3 Be7 8. Qa4+ c6> This is the book reply, but some interesting alternative are 8...Qd7 as in T Halay vs Fritz, 2005 or 8...Nbd7 as in Christiansen vs Parma, 1985. <9. Bg2 O-O> This is also book, but perhaps worth considering is 9...b5 as in H Banikas vs Deep Junior, 2001. <10. O-O Nbd7 11. Bg5> More often played is 11. Bf4! as in Beliavsky vs Short, 1985. <11...a6> Black has fully equalized. <12. Rad1 Nh5 13. Bf4 Nxf4 14. gxf4 a5 15. e3 b5 16. Qc2 b4 17. axb4 axb4 18. Ne2> Here,Fritz 8 slightly prefers 18. Na4=. <18...Qb6 19. Ng3 b3 20. Qf5 Nf6 21. Kh1?> White should immediately contest Black's control of the a-file with 21. Ra1 Ra2 22. Rxa2 bxa2 23. Qc2 Ra8 24. Ra1 c5 25. Nf5 Bf8 26. b3 c4 27. bxc4 dxc4 28. Rxa2 Rxa2 29. Qxa2 with only a slight disadvantage. <21... Ra2!> Black, at this point, has a strong and clear advantage. <22. Qb1 Ba6 23. Rg1 Ng4 24. Rd2 Bb4 25. Bh3 Bxd2 26. Bxg4 Bb4 27. Nh5 g6?> Fritz 8 indicates Black missed a win with 27...Qc7! 28. Ne5 g6 29. Nf6+ Kg7 30. Nfd7 Re8 31. Bd1 Re7 32. Bxb3 Ra5 33. Qf5 Qd6 34. Nb6 Ra1 35. Qc2 Rxg1+ 36. Kxg1 f6 37. Nd3 Rb7 38. Na4 Qe6 .

Jan-22-06
Premium Chessgames Member
  patzer2: <28. Nf6+ Kg7 29. Ne5 Qc7 30. Nfd7 Ra8??> This not so obvious blunder loses to White's brilliant reply. Instead, Black can hold the position with the simple defensive idea 30... Bd6! 31. Nxf8 Kxf8 . However, Fritz 8 indicates Black should avoid the tempting 30... Re8?! 31. f5! Rxe5

(a) 31... Bd6 32. fxg6 fxg6 (32... hxg6? 33. Bh5 ) 33. Bh5

(b) 31...Bc8 32. fxg6 hxg6 33. Nxg6 Rxb2 34. Qxb2 fxg6 35. Qxb3 Rh8 36. f4) 32. Nxe5 Bd6 33. fxg6 hxg6 34. Nxg6 Bxh2 35. Rg2 Bd6 36. Bd1 Kf6 37. e4 dxe4 38. Qxe4 Ra1 (38... fxg6? 39. Rxg6+ Kf7 40. Qe6+ Kf8 41. Rg8#) 39. Qf3+ Ke6 40. Rg1 Rxd1 41. Qxd1 Qa5 (41... fxg6 42. Rxg6+ Kd5 43. Rg5+ Ke4 44. Qe1+ Kd3 45. Qc3+ Ke2 46. Qe3+ Kd1 47. Rg1+ Kc2 48. Qc3#) 42. Qg4+ .

<31. Qf5!!> Because the White Queen is poison, she gets away with making herself enprise for a mating attack. <31...Rf8> If Black captures the Queen, it's mate-in-two after 31... gxf5 32. Bf3+ Kh6 (32... Kh8 33. Nxf7#) 33. Nxf7#. Other tries also fail. For example, White will mate after 31... Qd8 32. Qxf7+ Kh6 (32... Kh8 33. Nf6 Qe7 34. Nxg6+! hxg6 35. Qxg6 Bd3 36. Bf5! Be4+ 37. Bxe4 dxe4 (37... Qxe4+ 38. Nxe4 R2a7 39. Qf6+ Kh7 40. Qh4#) 38. Qh6+ Qh7 39. Qxh7#) 33. Bd1 Qg8 (33... Qe7 34. Rxg6+ hxg6 35. Qxg6#) 34. Ng4+ Kh5 35. Ndf6+
<32. Qf6+ Kg8>
If 32... Kh6, then 33. Bf5! wins immediately.
<33. Nxg6! hxg6>
If 33... fxg6, then 34. Be6+ Rf7 35. Bxf7#.
<34. Be6 1-0> Black resigned, but play might have continued

34...♔h7

If 34... Qd8, then 35. Rxg6+ Kh7 36. Qg7#.

35. ♗xf7

Also good is 35. Nxf8+ Bxf8 36. Bxf7 Bd3 37. Bxg6+ Kg8 38. Bf7+ Kh7 39. Bg8#.

35... ♕d6 36. ♗xg6+ ♔h6 37. ♕h4+ ♔g7 38. ♕h7#.

Jan-22-06  LIFE Master AJ: <patzer2>
Good analysis ... I looked over it briefly.

Do you have to be a premium meber to get the figurine algebraic notation to work?

Jan-22-06
Premium Chessgames Member
  Richard Taylor: I found the first move but missed the line as played - its clear the Q cant be taken - I thought that Black had to defence to Bf5 and - I have got the main ideas of every problem this week but to say I 'solved' each one would be stretching it.

My line -I could find no defence better than Rf8 was:

31. Qf5 Rf8 32. Qf6+ Kg8 33. Bf5 which of course is not as good as Dreev's moves but once I had played Qf5 in a game I may have found 33. N:g6 - I certainly would have played it (Qf5) as I was convinced it won.

I spent too much time looking at everything beside Rf8 thinking there was some other defence (I knew that Rf8 looked like the only good defence) I had probably missed...

Jan-22-06
Premium Chessgames Member
  Richard Taylor: 23. .... Ng4 was very tempting but in retrospect 23 ... c5 may have been better as Black clearly needs his knight to f6 to defend his King...

This was a strange game - White's King side pawns are better than they look at first and Black's attack gets turned against him and he is suddenly lost -out of the blue!

Jan-22-06
Premium Chessgames Member
  patzer2: Thanks <LIFE Master AJ>. I don't think you have to be a premium member. Simply use the

} symbol to close, and the

{ symbol to open,

with your regular notation in the middle, to get the figurine notation to show up.

Jan-22-06  alexjhu: what about 34 ... Ra1?
Jan-22-06  EXIDE: Well done!! Notice that black pieces are not in play. Always amazes me as to how chess can provide for such combinations.
Jan-23-06  Jarlaxle: if i would have given it more time i think i would have found it.. i kinda got wrapped up in bh5
Jan-23-06
Premium Chessgames Member
  Richard Taylor: <EmperorAtahualpa> After 34. ...Qxd7 35. Rxg6+ wins immediatley.
Jan-23-06
Premium Chessgames Member
  gawain: What a move! I worked very hard trying out all the dead ends after 31 ♗f5. Never saw the queen sac at all. It is astonishing how unhelpful all of Black's pieces are!
Jan-23-06
Premium Chessgames Member
  kevin86: White sacs all that he needs to in order to win. I especially like the queen sac at move 31 ♕f5 gxf5 32 ♗xf5+ ♔h8(or6) 32 ♘f7#
Jan-24-06  LIFE Master AJ: <gawain>
<"It is astonishing ...">

I am forced to agree with you, Black's pieces, mostly involved in a Q-side debate, have no way of aiding their royal leader on the other wing.

Nice puzzle, yes?

Oct-03-08  Trigonometrist: <kevin86>

31...gxf5
32.♗xf5+ ♔h6
33.♘xf7+ ♔h5
34.♘f6+ ♔h4
35.♖g4+ ♔h3
36.♘g5#

Oct-10-10  sevenseaman: 31. Qf5 works as it poses the threat of hitting f7 next. There is no escape for Black but to accept the sacrifice. Notice 31. Qxg6 doesn't work. A pretty game from Dreev.
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