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Gudmundur Sigurjonsson vs Jan Timman
Hoogovens (1980), Wijk aan Zee NED, rd 13, Jan-31
Pirc Defense: Kholmov System (B07)  ·  0-1



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sac: 23...Rxb2 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Dec-29-05  dkulesh: ok i have a legitmate question. it apears black can still win 22 f5. Thanks
Dec-29-05  Cogano: <dakgootje> Your analysis after 26.Be3 is based on the line 25. ...Rb8. What happens with the present line, 25. ...f5? Then how do you propose the game might/would continue, after 26.Be3? Thanks for your input. Cheers!
Dec-29-05  jacknor: <karlth> try for a quick tactical rating
Dec-29-05  Cogano: <dkulesh> it appears black can still win 22 f5. I think 22. f5 is too early, since at that point the b-file remains closed. Any successful line, imho, involving ...f5, or any other good Black move for that matter, depends on the b-file being open allowing a penetrating attack. I welcome other users' input on this. Cheers!
Dec-29-05  TTLump: <karlth> ChessMaster 7000 has a rating feature, as I am sure all the other major chess software packages do. You can purchase CM 9000 on-line for $19.95, so I wouldn't be surprised if you could buy CM 7000 on ebay for under $10.

To give you an idea what it is like: I had a rating of 1450 when I was playing tournament chess over 20 years ago. The first time I took the ChessMaster rating test, I scored 1625.

Chessmaster also has various "virtual opponents" of varying levels of skill ranging from 23 to 2711. In my admittedly subjective opinion based on comparing the GrandMaster games from this forum with ChessMaster's analysis, ChessMaster at its highest level (2711) with tournament time controls, seems to do better in the openings and middle-game than GMs up to about the 2600 level, but in the end-game, it doesn't do as well (2000 maybe?), so how that would translate into actual tournament results is anybody's guess.

So it seems that CM's own estimate of itself may be 100 to 200 points high (but keep in mind that this is also a function of the speed and memory capacity of the computer it is running on and mine is relatively slow - Pentium III 750mhz, 384 Meg Ram, it would likely do much better on the P4 2.8 Ghz, 512MB Ram configuration that is commonly available these days.)

Dec-29-05  Richerby: Ratings only allow you to compare your performance with the people in that one rating system. The rating assigned by a computer program lets you track your progress against that computer and allows approximate comparisons with other people using that software on similar hardware. But you shouldn't imagine that the number it gives you is in any way related to what your FIDE/USCF/other rating is or would be. You can't measure ratings in isolation.
Dec-29-05  Prelude: I found the winning f5 in about 20 seconds. My first thought was to displace the white queen off the d1-h5 diagonal. Nice puzzle today.
Dec-29-05  TTLump: <Richerby: Ratings only allow you to compare your performance with the people in that one rating system> I totally agree, but there is no reason that a computer couldn't be included as part of that rating system as long the computer bases its rating on games against rated "players", which of course would have to include other computers that are part of that same system. The major problem with rating specific chess programs, is that their performance varies greatly depending on the platform they are running on.

Dec-29-05  YouRang: Wow, that's the first time in a while that I found a Thursday puzzle fairly quickly.

<Thought process>
I noticed the potential Ne2 knight fork. It appears to be prevented by two things: (1) the white knight at c3, and (2) the white queen at g4.

But wait, the c3 knight really can't move due to ...Qb2#, which just leaves the queen. Can we deflect the queen? Yes, easily with 25...f5!

Premium Chessgames Member
  kevin86: Three parts to this somewhat simple problem.

1 divert the white queen from e2

2 Remove the white knight from c3 to open the bishop's attack on b2---by diverting it by a check at e2.

3 checkmate at b2 by the black queen.

Dec-29-05  ice lemon tea: simple yet very nice :)
Dec-29-05  EmperorAtahualpa: Crap, I missed this one. I was close though! I saw the threat of Ne2+ and thought the right move would definetely have to do with it. I should have been more patient and have a better look over the board to spot the natural move 25...f5. It should have been solvable for me.
Dec-29-05  oahuchess: easy cheesy lemon peesy
Dec-29-05  TTLump: Another interesting side-bar to notice in this position is that white is up a rook less 2 pawns after 23.... Rxb2, 24.Kxb2 ... and then after 25.Kc1 f5, white can get a piece in compensation for his Queen with 26.Be3!, so after fxg4, 27.Bxd4 Bxd4, 28.Rxd4, white finds himself down just the exchange (Queen for rook and knight) and 2 pawns, and he might be forgiven for experiencing a glimmer of hope, ... but then in a couple more moves he loses 2 more pawns, 28... Qh1+, etc. and Black's Queen has pretty much free reign of the board, and with his advanced passed pawn on g4, it is over fairly quickly ...
Dec-29-05  LIFE Master AJ: It was a pretty simple puzzle, I would have preferred they offer the position before Black's 22nd move. (But maybe that would have been too difficult for a Thursday.)

Thanks to CG-dot-com for the mental workout.

Dec-29-05  TalEl: (25..f5)decisive blow!....and then 26...Ne2+ pretty much ends the game
Dec-29-05  YouRang: <oahuchess: easy cheesy lemon peesy> I'm with you as far as lemon, ...but peesy??
Dec-29-05  lentil: since W's already a Rook up, I don't see any (material) problem after 26. Rdg1 fg 27. Rxg5 since after ... Nd2+, 28. Nxd2 Qb2+ 29 Kd1, White may be able to escape.
Dec-29-05  TopaLove: I bought a book of chess puzzles and Ive being solving 4 puzzles a day. There are a lot of puzzles like this one, I got it really fast. If someone is interested the book is called "303 Perplexing Chess Puzzles", Fred Wilson.
Dec-30-05  TTLump: 22... f5 is premature and black loses, because it allows 23.Qxg6! before black is ready to unleash his attack.

One possible continuation leads to a fascinating scenario where both sides are threatening mate with a Queen/Rook battery and it becomes a matter of "who blinks first"!

22. ... f5
23. Qxg6 Rf7
24. Bh6 Qb6
25. Bxg7 (threatening Bf6!+ followed by Qg7# or Qg8#) Qxb2+ 26. Kd2 Qxc2+
27. Ke1 Qxc3+
a series of checks leading to the Queen sac in order to disrupt White's mating battery) 28. Rxc3 Rxg7
29. Qxg7+ Kxg7
30. Rxd4 1-0
white's extra rook is decisive.

Jan-04-06  patzer2: Black's 25...f5! deflects and removes the guard of the White Queen with decisive effect (e.g. 25...f5! 26. Qh3 Ne2+ 27. Nxe2 Qb2#).
Jan-04-06  patzer2: White's 18. c4?! appears to be the losing move. An improvement is the immediate 18. g4! with better chances of equalizing.

Fritz 8's analysis indicates <1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bc4 Bg7 5. Qe2 Nc6 6. e5 Ng4 7. Bb5 O-O 8. Bxc6 bxc6 9. h3 Nh6 10. Nf3 c5 11. dxc5 Bb7 12. Bd2 Nf5 13. O-O-O Bxf3 14. Qxf3 Bxe5 15. h4 Qd7 16. Qh3 h5 17. Rhe1 Bg7 18. c6?!> appears to give Black the win.

Instead, 18. g4! Nd4 (18... hxg4 19. Qxg4 d5 20. h5 Qc6 21. Rg1 Rad8 22. hxg6 fxg6 23. Qxg6 Qxg6 24. Rxg6 Rf6 25. Rg4 c6 26. Bf4 Re6 27. Rg5 Rf8 28. Rdg1 Rf7 29. Kd1 Nd4 30. R1g3 Kf8 31. R5g4 ) 19. f3 Rab8 20. Qg3 hxg4 21. fxg4 Qc6 22. Qd3 d5 23. Bf4 Ne6 24. Be5 d4 25. Bxg7 Kxg7 26. Ne4 Rfd8 27. h5 = appears to hold the balance.

Black is winning after <18... Qxc6 19. g4 hxg4 20. Qxg4 Rab8 21. Rg1 Nd4 22. Rg3 Rb4 23. f4 Rxb2 24. Kxb2 Qb7+ 25. Kc1 f5! 0-1> and White resigns in lieu of 26. Qh3 Ne2+ 27. Nxe2 Qb2#.

Jan-14-06  Cogano: This may not be that insightful, but it occurred to me that White could conceivably play 26.Qf3, forcing a Q trade. He may still lose the game, but winning it will no longer be the straightforward mate, once the White Q leaves the d1-h5 diagonal. I'd love to hear what others make of this continuation. Take care all and have a good day. Cheers!
Feb-10-06  patzer2: <Cogano> If 26. Qf3, then 26...Nxf3 wins easy enough for Black.
Premium Chessgames Member
  GrahamClayton: <patzer2>An improvement is the immediate 18. g4! with better chances of equalizing.

I saw analysis which suggested that White could have reached an advantageous endgame with 17.g4 ♘g7 18.gh5 ♕h3 19.♖h3 ♗c3 20.♖c3

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