CCRL Discussion Board

The actual installation depends on the GUI used, which GUI do you use? See the help manual of the GUI as a first reference.

For winboard engines, you may have to edit the ini file also. Which engines do you use?

The best way to back up a hard drive full of data is with another hard drive. It's really that simple. .... I was once big on backing up data to CD ROMs and have hundreds in my closet attesting to this. But the time attending to burning is high, the data verification process lengthy, and the coaste...

Given the data size - I would suggest an external HD? Shaun Thankyou Shawn, for the suggestion. I started with an 80GB external hard disk, but it is about to be full now. Having a hard disk only as a backup seems to be a waste. I use tablebases only for analysis, and hence don't need all of them to...

I am downloading the 6 men tablebase files set by set. When any set is complete, I would like to copy them to CDs and free disk space. Copying each file to a separate CD looks like waste of CD. What is the best method for backing up each set to several CDs? 1) Convert all files in the set into a 7z ...

How about using the Bit Torrent protocol?

I find many large files shared on the net by this method. The load is shared by all.
See: http://en.wikipedia.org/wiki/BitTorrent_%28protocol%29.

Thankyou Kirill,

I am looking forward to faster downloads.

I started downloading the six men tablebases set by set starting last September, and so far 9 sets are complete. I am behind a firewall and consequently have a low ID problem. The average download speed is about 20kB/s .

Dhanish

# EGT tested Res. Δ plies Force Position DTC DTM DTZ Move JN# 1 KPKP 1-0 0 KPKP 8/2p5/6K1/8/8/5k2/P7/8 w 009 021 005 Kf5" 1 2 KRKP 1-0 0 KPKR 8/8/1KP5/3r4/8/8/8/k7 w 006 026 001 c7" 2 3 KRKP 1-0 0 KRKP 8/4K3/8/3pk3/3R4/8/8/8 w 008 021 003 (Rd2/3)" 104 4 KBPKB 1-0 0 KBPKB 2b5/8/1k6/8/...

jarkkop wrote: Nalimov tablebases can't be used by Toga, because of licensing conflicts.

Is this correct? Then how is it being used in Scid and Crafty?

Where are the terms DTZ and DTR defined? Wikipedia says: Haworth has discussed two other metrics, namely "depth to zeroing-move" (DTZ) and "depth by the rule" (DTR). These metrics correct for the fifty move rule, but few tablebases with these metrics have been released to the pub...

Can an ftp from your main (free) site be interrupted and picked up later? I am currently looking at a quote of 101hr downloard time (for KRBKNN) which is not practicable in one session. g With any good ftp client, It's possible to resume interrupted downloads, provided the server supports it. And I...

I was just going through Aaron Tay's FAQ http://www.horizonchess.com/FAQ/Winboard/egtb.html after a long time and noticed the sentence: Delfi has internal bitbase tablebases (stronger side wins/draws) for almost all the 4 men tablebases except N vs P and R vs B and KRPKR. No wonder it is able to sol...

Aaron Tay's FAQ has been the basic reference for quite a few years. http://www.horizonchess.com/FAQ/Winboard/egtb.html . It appears to have been updated significantly from the last time I've seen it. Wikipedia also has a good discussion: http://en.wikipedia.org/wiki/Endgame_tablebase . The help file...

Thankyou for the explanation, Codeman, and Guyhaw (Sorry for the "k" earlier!). It seems I misunderstood the definition of DTZ. In actual play, the winning side needs to minimise DTM, subject to the constraint that DTZ<50. Am I right? Are there any such tablebases? In correspondence chess,...

How can one determine DTZ from the DTM (Nalimov) tablebases? In the position No 7: 8/8/8/8/3B4/1q6/3KN3/k7 b posted earlier, Guy Hawk gives DTC/DTM/DTZ as 042/053/042. According to Wilhelm, there is a capture on move 35. How is this discrepancy? PGN Output from Wilhelm: [Event "EGTB"] [Sit...

Used Wilhelm to generate all unique move KRkn positions with dm>=35, and 463 positions were found. Checked these positions one by one using various engines, allowing 10s on Pentium IV and finally only 12 were left. And then I tried Delfi 5.1 and it solved all of them! I did not test the Fritz engine...

Glad you found the explanation satisfactory. I usually use 1 min per position per engine, and I test with about 20 engines It was mentioned "a few seconds" in the requirements post, hence I chose 5 seconds. I feel 1 minute may be too high with good hardware, it will be difficult to get pos...

I don't follow the logic of the "Hence". g It appears you don't use engines much, otherwise of course you would have tested the positions yourself. Why do we need such a test suite? I use engines frequently for analysis of my corr games, and I have discovered problems with tablebase acces...

This contribution supercedes my previous one which was maxDTM-oriented. This is largely based on maxDTC positions on file. There are probably plenty of Chess Studies which are technically correct and offer a suitable test. # Endgame Res. Δ plies Force Position DTC DTM DTZ Move 1 KPKP 1-0 0 KPKP 2K5...

Here is a position for a basic test suite for KNPkp: 8/8/8/8/5kp1/P7/8/1K1N4 w - - 0 1 Nalimov: Kb1-c2 {#50} Most engines seem to prefer Nf2, rather than Kc2, for example: Glaurung 1.2.1: --------------------------------------------------------------------------- 23 04:39 129.103.536 462.814 +1.68 1...

Hi Codeman & Rusz,

Thankyou for the interesting links.

It looks like krppkrp is quite far away. I have a correspondence game going on with this material!

Regards,
Dhanish

Hi all,

Is anybody working on the 7 men bases? At least selected ones?

I would be interested in krppkrp!

Regards,
Dhanish

Thanks, Victor for the utility.

One question: What is the basis for classification Must be, High, Medium, Low?

For example, krpkpp is considered low, but other lists show this as the sixth most frequent!

Regards, Dhanish