B+P vs. P Tablebase Needed

[Stephen Ham]

Dear readers,

I purchased the 5-man tablebases from CB for my engines many years ago. I knew then that the CDs didn't include every 5-man ending because some are so rare and because the engines solved the others.

But in my correspondence chess games, I discovered some obviously erroneous Rybka 3 output in B+P vs. P endings. In positions with the wrong colored Bishop, Rybka claims wins. Stockfish has enough endgame knowledge to know when the position is drawn and when it's not. And it's correct output is confirmed by 6-man websites.

Yes, I've read that Rybka 3 has a known "wrong B" endgame problem but I assumed that this was minimized in its Monte Carlo mode because games are played to mate.

However, I saw examples of Rybka 3 Monte Carlo analysis where resignations occurred in drawn positions! These Monte Carlo games are thus not played out to mate. Naturally, this means my Rybka 3's output and its Monte Carlo output are bogus.

So, I need to download the B+P vs. P tablebases from somewhere to fix this. Do you have any recommendations?

All the best,
Steve

[kingliveson]

If you've already been here then I ask for forgiveness: http://tablebase.sesse.net/

[Stephen Ham]

If you've already been here then I ask for forgiveness: http://tablebase.sesse.net/

Hi Franklin,

Thanks so very much for your kind offer to help.

At the risk of looking like a moron, how do I locate specifically B+P vs. P at that site? I didn't understand their file naming system there.

All the best,
Steve

[michiguel]

If you've already been here then I ask for forgiveness: http://tablebase.sesse.net/

Hi Franklin,

Thanks so very much for your kind offer to help.

At the risk of looking like a moron, how do I locate specifically B+P vs. P at that site? I didn't understand their file naming system there.

All the best,
Steve

http://tablebase.sesse.net/3-4-5/kbpkp.nbw.emd
http://tablebase.sesse.net/3-4-5/kbpkp.nbb.emd

I think you want exactly those two files (right click to save as)

Alternatively you can find them here:
http://www.olympuschess.com/egtb/nalimov/

Miguel

[kingliveson]

If you've already been here then I ask for forgiveness: http://tablebase.sesse.net/

Hi Franklin,

Thanks so very much for your kind offer to help.

At the risk of looking like a moron, how do I locate specifically B+P vs. P at that site? I didn't understand their file naming system there.

All the best,
Steve

I hope this helps:
kbbkn
[D]8/8/3k2n1/8/8/1B6/2K2B2/8 b - - 0 1
kpkbb
[D]8/2b5/1k6/1b6/6P1/5K2/8/8 w - - 0 1

[Stephen Ham]

If you've already been here then I ask for forgiveness: http://tablebase.sesse.net/

Hi Franklin,

Thanks so very much for your kind offer to help.

At the risk of looking like a moron, how do I locate specifically B+P vs. P at that site? I didn't understand their file naming system there.

All the best,
Steve

I hope this helps:
kbbkn
[D]8/8/3k2n1/8/8/1B6/2K2B2/8 b - - 0 1
kpkbb
[D]8/2b5/1k6/1b6/6P1/5K2/8/8 w - - 0 1

Thanks, Franklin. Yes, I knew that. It was the rest of the file names that threw me. But, I see now that I should have ignored that part.

Thanks again!

Steve

[Stephen Ham]

If you've already been here then I ask for forgiveness: http://tablebase.sesse.net/

Hi Franklin,

Thanks so very much for your kind offer to help.

At the risk of looking like a moron, how do I locate specifically B+P vs. P at that site? I didn't understand their file naming system there.

All the best,
Steve

http://tablebase.sesse.net/3-4-5/kbpkp.nbw.emd
http://tablebase.sesse.net/3-4-5/kbpkp.nbb.emd

I think you want exactly those two files (right click to save as)

Alternatively you can find them here:
http://www.olympuschess.com/egtb/nalimov/

Miguel

Dear Miguel,

Thank you so very much! I'm in your debt.

All the best,
Steve

[bob]

Dear readers,

I purchased the 5-man tablebases from CB for my engines many years ago. I knew then that the CDs didn't include every 5-man ending because some are so rare and because the engines solved the others.

But in my correspondence chess games, I discovered some obviously erroneous Rybka 3 output in B+P vs. P endings. In positions with the wrong colored Bishop, Rybka claims wins. Stockfish has enough endgame knowledge to know when the position is drawn and when it's not. And it's correct output is confirmed by 6-man websites.

Yes, I've read that Rybka 3 has a known "wrong B" endgame problem but I assumed that this was minimized in its Monte Carlo mode because games are played to mate.

However, I saw examples of Rybka 3 Monte Carlo analysis where resignations occurred in drawn positions! These Monte Carlo games are thus not played out to mate. Naturally, this means my Rybka 3's output and its Monte Carlo output are bogus.

So, I need to download the B+P vs. P tablebases from somewhere to fix this. Do you have any recommendations?

All the best,
Steve

All of the 3-4-5 piece tables are on my ftp box... ftp.cis.uab.edu/pub/hyatt/TB/3-4-5

Bob

[kingliveson]

Dear readers,

I purchased the 5-man tablebases from CB for my engines many years ago. I knew then that the CDs didn't include every 5-man ending because some are so rare and because the engines solved the others.

But in my correspondence chess games, I discovered some obviously erroneous Rybka 3 output in B+P vs. P endings. In positions with the wrong colored Bishop, Rybka claims wins. Stockfish has enough endgame knowledge to know when the position is drawn and when it's not. And it's correct output is confirmed by 6-man websites.

Yes, I've read that Rybka 3 has a known "wrong B" endgame problem but I assumed that this was minimized in its Monte Carlo mode because games are played to mate.

However, I saw examples of Rybka 3 Monte Carlo analysis where resignations occurred in drawn positions! These Monte Carlo games are thus not played out to mate. Naturally, this means my Rybka 3's output and its Monte Carlo output are bogus.

So, I need to download the B+P vs. P tablebases from somewhere to fix this. Do you have any recommendations?

All the best,
Steve

All of the 3-4-5 piece tables are on my ftp box... ftp.cis.uab.edu/pub/hyatt/TB/3-4-5

Bob

Dr. Hyatt, I actually got my copy from your server...will consider hosting the 6 men egtb?

[bob]

Dear readers,

I purchased the 5-man tablebases from CB for my engines many years ago. I knew then that the CDs didn't include every 5-man ending because some are so rare and because the engines solved the others.

But in my correspondence chess games, I discovered some obviously erroneous Rybka 3 output in B+P vs. P endings. In positions with the wrong colored Bishop, Rybka claims wins. Stockfish has enough endgame knowledge to know when the position is drawn and when it's not. And it's correct output is confirmed by 6-man websites.

Yes, I've read that Rybka 3 has a known "wrong B" endgame problem but I assumed that this was minimized in its Monte Carlo mode because games are played to mate.

However, I saw examples of Rybka 3 Monte Carlo analysis where resignations occurred in drawn positions! These Monte Carlo games are thus not played out to mate. Naturally, this means my Rybka 3's output and its Monte Carlo output are bogus.

So, I need to download the B+P vs. P tablebases from somewhere to fix this. Do you have any recommendations?

All the best,
Steve

All of the 3-4-5 piece tables are on my ftp box... ftp.cis.uab.edu/pub/hyatt/TB/3-4-5

Bob

Dr. Hyatt, I actually got my copy from your server...will consider hosting the 6 men egtb?

A few years ago our department chair was unwilling to commit enough funding to put together an FTP box large enough to host them. Takes a few terabytes (I don't know the exact size now, I did when the old FTP box failed...)