Rybka's weak play ( how is it possible )
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#3
It does appear to have played far below a 2100 setting. I can only say, check the engine's strength setting again.
Barring that, my guess is that Rybka was drunk when it played you. 
My guess would be that Rybka has a bad opening book for this line which might have been based upon some shallow human analysis. It probably was then unable to decide upon the best of bad moves when analyzing not deep enough to see the endgame problems it was heading towards.
2123 is a rating I really played against, no cheating. :D And I set depth 10.
lenslens, it is unacceptable that such a strong engines plays so badly Ruy Lopez. I also spotted that it plays f6 ( obviously a weak move in late opening ) in the same opening as black after I take knight at c6 with my bishop and exchange ( or maybe a few moves later ). I really don't get how is it possible.
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#6
TrumanB wrote:
2123 is a rating I really played against, no cheating. :D And I set depth 10.
lenslens, it is unacceptable that such a strong engines plays so badly Ruy Lopez. I also spotted that it plays f6 ( obviously a weak move in late opening ) in the same opening as black after I take knight at c6 with my bishop and exchange ( or maybe a few moves later ). I really don't get how is it possible.
Why did you set depth 10? You should only set the elo level. What GUI (graphical user interface) are you using?
Check the installation, and your hardware, and that no other software is hogging system resources.
EscherehcsE wrote:
TrumanB wrote:
2123 is a rating I really played against, no cheating. :D And I set depth 10.
lenslens, it is unacceptable that such a strong engines plays so badly Ruy Lopez. I also spotted that it plays f6 ( obviously a weak move in late opening ) in the same opening as black after I take knight at c6 with my bishop and exchange ( or maybe a few moves later ). I really don't get how is it possible.
Why did you set depth 10? You should only set the elo level. What GUI (graphical user interface) are you using?
To be honest I'm a beginner with chess programs and I thought that with higher that it will be stronger. Where should I look for GUI?
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#9
Chyss makes some good points.
But it could be that your problem is that you're using both elo settings and depth settings. I'd think if you're specifying the elo level, then you should only use some kind of time control, either so many seconds per move, or so many moves in so much time.
Yeah, I set ELO rating 2123 as you can see with 10min for a game. I tempered smth with depth but not particulary for that game. And before that I easily won against Rybka ELO 2000.
I don't know how to check installations and hardware...
TrumanB wrote:
2123 is a rating I really played against, no cheating. :D And I set depth 10.
lenslens, it is unacceptable that such a strong engines plays so badly Ruy Lopez. I also spotted that it plays f6 ( obviously a weak move in late opening ) in the same opening as black after I take knight at c6 with my bishop and exchange ( or maybe a few moves later ). I really don't get how is it possible.
Since you don't give any moves I have to smell my finger:
If you mean 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.0-0, then 5...f6 is obviously a good move (used to be the main line some 10 years ago, and is still played a lot).
And- well, if you don't know how to check if installation is made properly, you can call the customer support, which you have purchased together with the engine.
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#12
TrumanB wrote:
Yeah, I set ELO rating 2123 as you can see with 10min for a game. I tempered smth with depth but not particulary for that game. And before that I easily won against Rybka ELO 2000.
I don't know how to check installations and hardware...
Well, without getting into the details of the GUI; Whatever you did to set the depth to 10, turn that off.
And if you can figure out how to use a task manager on your computer to see the resources being used, that would help.
levels - fixed depth ( 5 ). That's what is set already.
pfren, I didn't know that f6 is a good move. Shame on me. In that case Rybka played badly mid and end game...
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#14
TrumanB wrote:
levels - fixed depth ( 5 ). That's what is set already.
Then unset it already!
Fixed depth levels (especially small) can result in certain cases to bad blunders.
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#17
It sounds like this is a Chessbase (Fritz) GUI? I stopped using Fritz years ago just because of headaches like this. Thank God I no longer have to deal with Chessbase stuff.
pfren wrote:
Fixed depth levels (especially small) can result in certain cases to bad blunders.
Well, now I'm totally confused. :D
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#19
Well, I guess I'm a little confused also. If your time control is 600 seconds (10 minutes) as the PGN states, then I doubt that the depth is being limited. Maybe the weakness is being caused by something else.
Out of curiosity, was this a "Handicap and Fun" game?
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Rybka 4 is known as one of the strongest programs but what surprises me how weak it played against me. I won a few times against 2000+ rating and my chess.com rating is around 1250 which is really weak. How is it possible that Rybka plays so badly?!
Check this game for example:
[Event "Blitz 10m"]
[Site "?"]
[Date "2015.01.31"]
[Round "?"]
[White "Rybka 4"]
[Black "Milos"]
[Result "0-1"]
[ECO "C62"]
[WhiteElo "2123"]
[BlackElo "1400"]
[PlyCount "80"]
[TimeControl "600"]
1. e4 {0} e5 {3} 2. Nf3 {0} Nc6 {1} 3. Bb5 {0} d6 {1} 4. d4 {0} Bd7 {2} 5. Nc3
{0} exd4 {6} 6. Nxd4 {0} Nxd4 {3} 7. Qxd4 {11} Nf6 {9} 8. Bg5 {11} Be7 {8} 9.
O-O-O {9} Bxb5 {3} 10. Nxb5 {3} a6 {1} 11. e5 {9} axb5 {11} 12. exf6 {2} Bxf6 {
2} 13. Rde1+ {14} Kf8 {8} 14. Bxf6 {6} Qxf6 {2} 15. Qxf6 {3} gxf6 {1} 16. a3 {7
} Re8 {2} 17. h4 {4} Kg7 {3} 18. Rhf1 {8} f5 {1} 19. c3 {5} f6 {1} 20. Rg1 {4}
Kf7 {1} 21. Rh1 {5} Rxe1+ {2} 22. Rxe1 {1} Re8 {1} 23. Rxe8 {2} Kxe8 {1} 24.
Kd2 {12} Ke7 {2} 25. Kc2 {4} Ke6 {1} 26. b3 {10} Kd5 {4} 27. Kd1 {3} Ke4 {3}
28. Kc2 {10} c6 {9} 29. Kb2 {10} Kd3 {7} 30. f3 {10} Ke3 {9} 31. Kc2 {8} c5 {6}
32. h5 {4} d5 {2} 33. Kb2 {10} Kf2 {4} 34. Kc1 {8} Kxg2 {1} 35. f4 {3} Kf3 {1}
36. Kd1 {9} Kxf4 {1} 37. Ke1 {8} Ke3 {1} 38. h6 {7} f4 {1} 39. Kf1 {6} f3 {1}
40. Kg1 {1} d4 {3} 0-1