CCRL Discussion Board

Actually, De Koning EDGB file format use these 8x (pawnless) and 2x (with pawns) symetries in indexing. I also suspect that feg uses mailbox array board representation (12 rows and 10 columns).
I will write more about that later.

Tuhma

Feg / De Koning EDGB file format Let's start with indexing. Feg uses 64-bit indexing that is divided to two 32-bit integers. 32-bits for white pieces and 32-bits for black pieces. My opinion is that indexing is relatively simple compared to Nalimov indexing. Let's call 32-bit part of index reserved ...

I found file named newfeg.rar from emule. 100 position limit seems to be revoved ? ed2k://|file|NEWFEG.rar|159840|9E17A59440A19E9F7D3BB5002B2A1490|h=EB6A7WSFLCCUZIPH42SFZNQQQ6LDJAY6|/ [game KQQKQ_M026_ 108 ] [annotator hash o00336677 o00001222] [posj] . . . . . . . Q . . . . . . Q . . . . . . . . . ...

Conservative upper boun :-) I don't know exact number, but I would like to know. Here are three interesting games. A lot of pieces. [Event "Gausdal Classics op"] [Site "Gausdal"] [Date "2007.04.26"] [Round "9"] [White "Greet, Andrew"] [Black "Li...

from chessagmes.com (endgame explorer): KRNPKRB 85 games: http://www.chessgames.com/perl/chessending?s=RNP&i=RB&result=* KRNNKRB 1 game: http://www.chessgames.com/perl/chessending?s=RNN&i=RB&result=* KRBNKRB 2 games: http://www.chessgames.com/perl/chessending?s=RBN&i=RB&resul...

I have few questions regarding tablebases and endgames. 1. How ofter OTB happens 7-men pawnless ending. Like how many such games are in megabase 2008? Any idea? Are these just strage curiority or does it happen? Which one is most usual? 2. How many underpromotion wins / draws are found using tableba...

If you can write a program that is able to generate all 6-men tablebase files (nalimov format) in 2,4 - 2,7 Ghz quad with 2-4 giga memory under 100 days then this is a great leap forward! I have been downloading all 6-men tablebases 1,3 years now and I am not finished yet. Just to set your goals to ...

I have been using feg.exe a lot lately. And quite suprisingly, I found very nice undocumeted feature from it. feg has two undocumeted commandline options : feg -p and feg -pe where p means position, I guess, and pe means epd position. I don't know how -p commandline option works, but I was able to f...

BTW. You are talking about generating in the memory vs. generating in the hard disk.
How about solid state disks or USB memory?
Some USB memories are quite cheap like Corsair 32GB Flash Voyager is around 100 - 150 Eur + much better randon access times compared to HD.

regards,

Tuhma

About kQQQkQQQ, I guess that (462*62*61*60*59*58*57)/(6*6) = 568 *10^9 positions. i guess that quite many are illegal?

Tuhma

>First of all, there is a huge differece between KQQQKQQ and KRRPKRR: >KQQQKQQ should be easier to generate as many pieces are the same. In total there would be about 28G positions >(462*62*61*60*59*58 / (6*2) ) Thats only 5 times bigger than a usual 6 men TB. KRRPKRR is harder as you first have to ...

> is it really worthwile to squeeze the RAM usage into 2GB, which is at the edge of what is possible (for 2+4 men), or should > we simply use 3GB, which makes it completely trivial... 4 giga is quite standard nowdays. And it is very likely that any program that you are going to write is going to be ...

Hello, I see that you are trying to make tbgenerator that would enable 7-men tablebase generation? Is so, then I would like to know how long would it take to generate one 7-men tablebase using your tbgenerator? Like KQQQKQQ or KRRPKRR ? I made some tests using feg and using it KQQQKQQ would take abo...

Dear Sir, Someone sent me a message that some of my files are corrupted. They are not. I bought a new hard disk that was faulty and it broke down quite soon. It is possible that this disk has caused some problems. My files are ok but there is possibility that there have been some reading errors from...

I am going to be online at least few weeks. If you don't have any of those tablebase sets, that I have then I suggest that you download it using emule right now. I have all pawnless 3-3 and right now I am downloading krbpkb and krppkb + here is listing of my "old tablebase directory": kbbn...