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Up Topic Rybka Support & Discussion / Rybka Discussion / Rybka Strategic Thinking
- - By isilverman (***) Date 2010-09-26 03:12
I'm not sure how to post a position here, so if someone could kindly do so, I'd appreciate it. It is as follows:

r2r2k1
1bp1npbp
p5p1
1p6
2p1P3
P1N1BP2
BPP3PP
R4RK1

Is there any program that will realize that ...Bxc3!! turns this difficult game into a mindless win for Black?
Parent - - By TheHug (Bronze) [us] Date 2010-09-26 03:18
Your missing something in your FEN line there. What interface are you using I can help you post
Parent - - By isilverman (***) Date 2010-09-26 03:25
I rechecked and don't think i am missing anything.

I am just using firefox.
Parent - - By TheHug (Bronze) [us] Date 2010-09-26 03:26
No i mean were did you get that FEN form?
Parent - - By isilverman (***) Date 2010-09-26 03:30
It's a game I am in the middle of playing. I am White. I suddenly realized that I was dead lost if he played Bxc3, and also then thought it would be interesting to see if Rybka saw this. So far it has not.
Parent - By TheHug (Bronze) [us] Date 2010-09-26 03:34
If you can, if say you use the fritz interface. Make the position on there then. copy position then paste it in a post. It will automatically make a chess board for you with in the post. If you need help to do the things I said before let me know what "chess" interface you are using
Parent - - By Labyrinth (****) [us] Date 2010-09-26 04:04
In the position you posted it is white to move:

r2r2k1/1bp1npbp/p5p1/1p6/2p1P3/P1N1BP2/BPP3PP/R4RK1 w - - 0 1


So I changed it to black to move for analysis, unless you can provide what move you played.

Rybka suggests f5 for black here, with -0.48 (advantage to black). After Bxc3 R4 reports a draw.

Personally I wasn't impressed with Bxc3 before the computer analysis. Why you think it is so good?
Parent - - By AgentEE7 (**) [us] Date 2010-09-26 04:33
I imagine because after bxc3 White's white square bishop can't be activated.
Parent - - By DeletedAccount (**) [de] Date 2010-09-26 08:16 Edited 2010-09-26 08:34
Yes, after Bxc3 white is clearly lost because black is a piece up (since the Ba2 will never escape its prison). Computers do not understand this because it requires logical thinking instead of calculating variations.

I am using Rybka 3 and it does not understand it (of course), but in Monte Carlo analysis depth 6 white is only able to draw 3 out of 20 games. The games that white draws are games where black either

A) captures the c2 pawn which is a very bad move as it frees the Ba2

or

B) allows Rab1 and Bxc4+ bxc4 Rxb7 which is also unnecessary and stupid.

Edit:

or

C) gets the pawn a6 which I am convinced can be avoided if black understands its importance (which Rybka clearly does not).
Parent - - By isilverman (***) Date 2010-09-26 12:47
How do you set up R4.05 to do Monte Carlo analysis of a position? Thanks.
Parent - By DeletedAccount (**) [de] Date 2010-09-26 13:38
I don't know because I am still using Rybka 3 (with the Fritz GUI), but maybe someone else can help?
Parent - By Moz (****) Date 2010-09-27 01:23

> How do you set up R4.05 to do Monte Carlo analysis of a position? Thanks.


Engine Competitions -> New -> Randomizer Match
Parent - By isilverman (***) Date 2010-09-26 11:46
Black to move. After Black plays Bxc3, the white bishop can never escape the pawn prison. The most White can do is exert a little pressure on a6 by trapping his own rook on a1 after playing Bb1.

Black will operate for the rest of the game effectively ahead by a piece.

I wonder if a super Aquarium setup will find Bxc3 after thinking for a while. If it does not, then this becomes a great example of the difference between human and computer thinking. I imagine that even a Class A player in a regular tournament game would find this with no problem.
Up Topic Rybka Support & Discussion / Rybka Discussion / Rybka Strategic Thinking

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