CCRL Discussion Board

I have the same problem with the KBPKBP tablebases and ChessBase 9! The program stops after a few seconds if those tablebases are present. I don't even have Spike 1.2!
Can you check if the KPPPKP tablebases cause the same problem?

I didn't use any program to generate those diagrams! This is a general feature of the CCRL Discussion Board. You can post a diagram using HTML-like tags with "diagram": [diagra m]FEN[/diagra m], where FEN must be a position in Forsyth notation (for the initial position FEN is rnbqkbnr/pppp...

"Dual" - double solution in a chess study or a problem. A chess composition with a dual is worthless (it is "cooked" :) ). In the following position the Nalimov database gives two winning moves(1.Kb4 #64 and 1.Qb3 #66): 8/8/8/8/Q1P3k1/K3q3/8/8 But the second move leads to a cycle...

The question in my mind is whether there is simplicity in search that outweighs the hassle of creating a derivative tablebase set. I don't know. As far as I know, Wilhelm is the only software which has the feature to search for unique moves in the Nalimov databases. For example, you can search for ...

The idea to use the 4th bit pattern is very nice. As I am a study composer, I don't really care of the 50 move draw rule. So I'm one of those chess purist jkominek has talked about. But I don't need the exact depth of a win either. A simple win/draw/lose information and the fact that in a position t...

Linares Round 9: Carlsen-Shirov 8/1P1R4/4N1k1/8/4K3/1r4b1/8/8 w 64.Kd5 Rb1 65.Kc6 Rc1+ 66.Nc5 Bb8 67.Rd5 Ba7 68.Kd7 Bb8 69.Ne6 Kf6 70.Rc5 Rb1 71.Nd8 Bh2 72.Rc6+ Ke5 73.Rc1 Rb3 74.Rc2 Bf4 75.Kc6 Kf5 76.Rc5+ Kf6 77.Kd7 Rb1 78.Kc8 Bh2 79.Rc6+ and now Shirov blunders in the following position: 2KN4/1P6/...

http://f22.parsimony.net/forum41668/messages/46562.htm
http://www.shredderchess.de/schach-news ... ahlen.html

Some 7-men tablebases with pawns have been generated more than a year ago. See the following link:

http://www.vlasak.biz/tablebase.htm

But there is a problem: no news since then...

Sorry Guy, I still think that the total size of the 6-man is only 1.2TB(5+1 included) and not 1.5TB. Your number was only a guess before the generation process of the tablebases ended. I didn't really understand your last sentence - maybe my English is to be blamed. So what would be the size of the ...

I would estimate the total size of the 7-man tablebases as much bigger: 240TB rather than 20-30TB as in the previous post. Also the correct size of the 5-man tablebases is 6-7GB (not 16.9GB). 4-man ~30MB 5-man ~6GB (4-man x 200) 6-man ~1.2TB (5-man x 200) so 7-man ~240TB (6-man x 200). Improving the...

The Tablebase 3.2 engine works fine for me under Chessbase9. In your first position it shows the draw after 1.c4.

Many thanks for your answer! So the my study is cooked, as I suspected. Somehow I have to find a version which avoids those tricky RNN_RB endgames...

I would be interested to take part in the experiment. I have almost all of the 6-man tablebases and I could use Rybka and Shredder 10 for analysis.

Thanks for your answer! I am a study composer and these are maybe sad news for one of my new studies: there are some RNN/RB positions which must to be only draws...Like the following positions with white to move: 8/2N2k1K/6N1/5rb1/8/8/8/1R6 1R5K/3k4/6N1/1N4r1/8/8/3b4/8 But I am happy that somebody i...

Does anybody knows what is the general outcome of this endgame?

OK, maybe not a classical bitbase helps in the generation process but some other pre-computed, small-sized database.

Just an idea: what if you use pre-computed bitbases (which are very small in size compared to tablebases) and then, during the game, compute the tablebases you need with the help of the them. Generating the tablebases with the help of the bitbases should be faster. The only question is: how much fas...

Sorry Black Bubble,
but I thought you want detailed endgame keys.
I don't really see the usefulness of general endgame keys. Mixing KPPKPP endgames with KRPKRP or KQPKRR in a single subkey doesn't make much sense to me.

Arpi

The transfer button is greyed out for me too, so I can't transfer endgame subkeys to another database either. This is probably another bug in the program. You have to install the whole endgame key to your database. If you want to separate pawnless(33) and pawnful(33p) endgames, you have to use 'Defi...

Can you describe what went wrong? What is different when you try to move the keys with pawns?

I have attached a small collection of tablebase studies with the complete 6-men endgame key.

4) kbbbpk: For wtm, maxdtm is 24 and there are 45 positions. For btm, maxdtm is 30 and there are 4 positions. They are essentially equivalent and very nice: White: Kh2, Bg1, Ba6, Bd8, Pb7; B: Ka5 (black to move) After 1. ... Ka6: White can only underpromote 2. b2N. Then 2. ... Kb7 3. Nd7 Kc7 wins a...

Welcome to our forum! I am sharing the source code for the 6 man TB generation on eMule (tbgen.zip). But please read first an old post in this forum with the title "6 Man TB Generator". There is a compiled version too (RunTbGen.rar). But it is much simpler to download the tablebases from e...

As I see it, Marc Bourzutschky's tablebases will not going to be public. Am I wrong? We have to find another solution for 7men tablebases. Any ideas?

Yes, that file from the Chessbase Turbo DVD was defective. See the long discussion in the thread "Damaged files"(on page 3).