Sep-09-08
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| arsen387: yesterday on QA I finished one of the best games in my life. Being 2!! pieces down almost all the game, I eventually managed to pull a win against a very strong player, another CG.com user Zonszein. Here is the complete PGN of that game. [Event "Challenge"]
[Site "http://www.queenalice.com/game.php?..."]
[Date "2008.8.14"]
[Round "-"]
[White "arsen387"]
[Black "zonszein"]
[Result "1-0"]
[WhiteElo "1740"]
[BlackElo "2149"]
[ECO "B90"]
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6 7. g4 Be7 8. g5
Nfd7 9. h4 Qc7 10. h5 Nc6 11. f4 b5 12. g6 hxg6 13. hxg6 Rxh1 14. gxf7+ Kxf7 15.
Nxe6 Bh4+ 16. Kd2 Qa5 17. Qh5+ Ke7 18. Qg6 Nf6 19. Qxg7+ Kxe6 20. Bc4+ bxc4 21.
Rxh1 Nxe4+ 22. Kc1 Nxc3 23. Rxh4 Nxa2+ 24. Kd1 Qd5+ 25. Ke1 Ne7 26. Rh7 Qa5+ 27.
Kf2 Qf5 28. Qxe7+ Kd5 29. Rh6 Qxc2+ 30. Kg3 c3 31. Qxd6+ Kc4 32. Qd4+ 1-0 Later will come some analysis about this game |
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Sep-09-08
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| arsen387: until 11..Rb8 it follows the game A Antoniou vs P Lebrun, 2006, and I must confess I took some ideas from there. After 11..b5 I decided to sac the R for an attack. Chessmaster10 evaluates that R sac as -4.2 for black, though I don't trust that engine much. Of course, most likely that sac is unsound but gives whites good practical chances. So let's go from move 11..b5 12. g6 hxg6 13. hxg6!?? Rxh1 14. gxf7+ Kxf7 <any other move allows Nxe6 royal fork> 15. Nxe6 Bh4+ <I missed this move while playing the sac and thought that this was the beginning of my doom. of course not Kxe6? 16.Qd5+ Kf5 17.Qf5#> 16. Kd2 Qa5 17. Qh5+ Ke7 <better than Kxe6> 18. Qg6 Nf6 <Bf6 was better according to engine> 19. Qxg7+ Kxe6 20. Bc4+ bxc4
click for larger view
<Amazing, isn't it, whites are 3 pieces down but have a win with f5!>
21. Rxh1 <I missed 21.f5! Kd5 and only then 22.Rxh1 after which it was +1.3 to my favour, as now black N is pinned to K and has not Nxe4+> Nxe4+ 22. Kc1 Nxc3 23. Rxh4! Nxa2+ 24. Kd1 Qd5+ 25. Ke1 Ne7 26. Rh7! Qa5+ 27. Kf2! Qf5 <now engine finds mate in any variation> 28. Qxe7+ Kd5 29. Rh6 Qxc2+ 30. Kg3 c3 31. Qxd6+ Kc4 32. Qd4+ <wherever K goes mate in couple moves> 1-0 Every opinion is welcome and much appreciated. I hope <Zonszein> will have some comments about the game too. |
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Sep-09-08
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| ravel5184: <arsen387> What's up with your forum? Only 2 kibitzes? (well 3 now). |
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Sep-09-08
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| arsen387: well 4 now. nothing, just opened today for the game discusiion and maybe will close in several days :) |
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| Sep-10-08 |
| Where is my mind: Hi <arsen387>
Congratulations on being equal 1st in the QA tour 2. |
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| Sep-10-08 |
| Where is my mind: Great game Arsen.You showed no fear in your attack,which is the best way to play Keres attack sicilians.I noticed Zonszein reacted to g6 better than the player in the database game A Antoniou vs P Lebrun, 2006 you were following.For what its worth Fritz 10 dosen't rate your rook sac as bad as chessmaster 10 does.I like the way you got blacks king into the center of the board.Black had a good counter attack but your 27.Kf2! finished that.Well played. |
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Sep-10-08
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| arsen387: thanks <Where is my mind>. I am very interested how much exactly does Fritz evaluate the sac? In fact during the game I didn't believe that my attack could succeed. Just Zonszein's rating was so high that I would only lose 1 or 2 rating points in case of loss, so I decided to play 'all into attack' startegy. It was only after around move 25 that I felt I'm winning. It was really amazing experience |
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| Sep-10-08 |
| Where is my mind: The computer didn't like 12.g6 more than the sac.The evaluation goes from plus one +1.30 after 11.b5 to negative -1.30 after 12.g6.Then the longer it calculates it dosent rate 13.hxg6 as so bad.After a few minutes it gives  -1.64.
So the difference between what the computer thinks is the best 13th move and 13.hxg6 is only 0.3.
The means the computer calculated that black had a winning advantage after the rook sac.
I'll have another look at the game,in particular the rook sac, later.
It seems as though fritz didn't evaluate the rook sac as dropping a piece, like Chessmaster10 did.
It was probably unsound like you thought, but you seen the practical chances and made good use of them.
<It was really amazing experience>That is good to hear. |
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Sep-10-08
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| TheAlchemist: <arsen387> A really beautiful game, congratulations. I know from personal experience that pulling off a game like this once in a while more than makes up for a bunch of blunders and games gone wrong :-). If you are interested, here's a quick look at what Rybka thinks: At move 12 it actually prefers <12.h6> g6 13.Nxc6 Qxc6 14.Qd4 Rf8 15.O-O-O, evaluating it as +0.38 at 16 ply, the evaluation was decreasing slightly. I didn't want to investigate it any further, since it's not really important. <12.g6> is rated as -0.57 at 18 ply, the evaluation was increasing slightly (for black). Early on, 12...hxg6 13.a3 Bf6 14.Be2 Bb7 15.Ndxb5 axb5 16.Nxb5 Qa5+ 16.b4 Nxb4 17.Nxd6+ Ke7 18.Nxb7 is suggested. Then it switches to 13...Nxd4 14.Bxd4 Nf6 15.Be2 e5 16.Be3 Bb7. And finally, to 13.Bg2 b4 14.Nce2 Nxd4 15.Qxd4 gxh5 16.O-O-O Rb8. <13.hxg6> is initially evaluated as more than -3.10. However, as the analysis progresses very slowly and it seems a little screwed up, I've given it a little help and after 13.hxg6 Rxh1 14.exf7+ Kxf7 15.Nxe6 it initially suggests 15…Bh4+ 16.Kd2 Rh2+ 17.Kc1 (-1.51 after 16 ply and dropping). After 16…Qa5 17.Qh5+, however, 17…Kxe6 18.Bc4+ bxc4 19.Qe8+ Be7 20.Rxh1, is scored as 0.00 at 12 ply. There it switches to 17…Ke7 18.Qg6 Bf6 19.Nxg7 Bxg7 20.Qxg7+, scoring it as -0.28 at 16 ply and dropping. At 17 ply it suggests the in-between 19…Rh2+ 20.Be2 Bxg7 21.Qxg7+ (-0.36). After 18…Nf6 it finally gives you an edge. However, at 16 ply, it recommends <15…Qb7> (instead of 15…Bh4+) 16.Qd5 Bh4+ 17.Kd2 Ke7 18.Nxg7 Rh2+ 19.Be2 Nf6 (-2.10). At 18 ply the line is 18.Ng5 Bxg5 19.Qg8 Rh2+ 20.Kc1 Nb4 21.Qxg7+ (-2.04). Maybe this could refute your attack, though deeper analysis is definetly required. I don't have enough time or a fast enough computer for the task :-) |
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Sep-10-08
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| SwitchingQuylthulg: <TheAlchemist+Rybka: <15…Qb7> (instead of 15…Bh4+) 16.Qd5 Bh4+ 17.Kd2 Ke7> In this line, 17...Nf6 looks like an instant killer to me. I don't really see any chance for White to reasonably play on with an attack; the line that has lower evaluations than 17...Ke7 is probably 18.Nd8+ Kf8 but after that Black seems to be able to exchange queens in every variation in a way leaving him a little but yet enough material up. With no queen White's attack evaporates, right? |
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Sep-10-08
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| TheAlchemist: <SwitchingQuylthulg> You're right, thanks for poiniting it out. I didn't take the time and look into it carefully enough, shame on me. 17...Nf6 looks much more "human" than 17...Ke6, a computer might evaluate it lower, but it looks much simmpler and more straightforward. I guess the best white can do is 18.Nd8 Kf8 19.Qxc6 Qxc6 20.Nxc6, but it seems objectively lost. I have to admit, though, that it's really hard (emotionally) to pick apart an attack like that, but for the sake of objectivity... |
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Sep-11-08
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| arsen387: thanks <Where is my mind>,yesterday I leaved the computer about 15 minutes to evaluate 13.hxg6 and it finally came to -2.37. Still there's a difference with Fritz evaluation, but not as big. |
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Sep-11-08
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| arsen387: thanks <Alchemist> for detailed Rybka analysis. much appreciated. Sometimes I believe my intuition more than Chessmaster as it is weak engine, but in Rybka I trust:) <I know from personal experience that pulling off a game like this once in a while more than makes up for a bunch of blunders and games gone wrong :-).> exactly :) <Alchemist>, <Switch>
<<15…Qb7> (instead of 15…Bh4+) 16.Qd5 Bh4+ 17.Kd2 Nf6> line is very intesting and really seems like much better for black from first glance. I will try to go deeper into it later. |
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