19 votes
Accepted

Do Stockfish and the tablebase work together or independently?

play the game until six pieces Stockfish doesn't do that, that's not what tablebase is for. Briefly, tablebase boosts engine search well before six-men position reached on the board. Let's do an ...
SmallChess's user avatar
  • 22.5k
19 votes
Accepted

How does Syzygy store its information?

Since there is no single comprehensive publication this is based on the probing code, the generator and various explanations from Ronald de Man (the author of the generator). When probing pretty much ...
Niklas's user avatar
  • 457
18 votes
Accepted

What is the status for EIGHT piece endgame tablebases?

Marc Bourzutschky's Google Drive with progress information Bourzutschky's first email regarding his progress Bourzutschky's second email regarding his progress Kirill Kryukov's Endgame Tablebase ...
Nelson O's user avatar
  • 715
17 votes
Accepted

Are there attempts at creating practical endgame tablebases?

There is a contradiction in terms in "only" generating practical endgame tablebases. We have to understand how tablebases are generated to see why. Tablebases are generated by working backwards from ...
Remellion's user avatar
  • 5,030
16 votes

What do DTM, DTZ, DTC, DTR, DTZ50, and DTZR mean?

In various endgame tablebases, the terms mean as follows: Depth to Mate. For each position that is represented, 'DTM' indicates the theoretical value, and the number of winner's moves to 'Mate' if ...
edwina oliver's user avatar
13 votes

What is the status for EIGHT piece endgame tablebases?

We are still far away from the solution. Estimates for the size of the completed tablebase are around 10 Petabytes. Compare that to the 140 Terabyte hard drive (later trimmed down to 18TB in the ...
Matthew's user avatar
  • 359
12 votes
Accepted

What percentage of the time does White win in the Lomonosov tablebase?

As I do not have access to the full Lomosonov tablebases, here is an answer based on the Syzygy tablebases, which are available online in machine-readable format. I interpret your question as "...
wimi's user avatar
  • 871
11 votes

Does the Lomonosov Tablebase (and others) include extra material positions such as KQQvKQQQ?

The Lomonossov tablebases include all 7-man positions with the exception of 6 pieces vs lone king. Most material distributions you consider "ridiculous" are in fact required to evaluate "interesting" ...
Queeg's user avatar
  • 684
11 votes
Accepted

How far from solving chess are we?

Currently most of the 7-piece Lomonosov tablebases have been created. the only ones that weren't, were the K vs. K + 5 pieces. Those took about 6 months using the Lomonosov supercomputer. Based on ...
Herb's user avatar
  • 4,196
11 votes

Estimation of "God's Elo"

I'm arguing below that it is logically problematic to even define such a thing. The ELO of the strongest computers is really defined only relative to a ladder of weaker computers, starting from the ...
Kostya_I's user avatar
  • 1,902
10 votes
Accepted

Tablebases say this position is drawn, but Stockfish disagrees-What does that mean?

If the tablebase says that it's a draw with optimal play from both sides, then you can always ignore whatever Stockfish or any other engine says. The tablebase knows the objective evaluation for any ...
Inertial Ignorance's user avatar
9 votes
Accepted

How is it possible that the Lomonosov-endgame-tablebase from 2012 still is the most powerful tablebase?

I am a developer currently working on software to compute endgame tablebases. The real bottleneck with calculating positions is not memory per se but the working memory and computing cycles needed to ...
bcdan's user avatar
  • 206
9 votes
Accepted

Are Nalimov tables still being built?

Certainly there is work on 8-man tablebases. One source of information on this is from the Chess Endgame Study Association here This article describes pawnless ending work. It is simpler to start with ...
Michael West's user avatar
  • 5,196
8 votes
Accepted

How can I download Syzygy tablebases efficiently?

I found out wget supports mirror site listings, so I used wget --mirror --no-parent --no-directories -e robots=off http://tablebase.sesse.net/syzygy/3-4-5/ It might take a few tries to download all ...
qwr's user avatar
  • 3,684
7 votes

Longest way to mate with 1 queen against 4 queens

This max-DTZ position is mate in 8, but probably also a dead-end because it seems hard to improve starting here. [FEN "7q/4q1q1/8/8/3q2Q1/1K6/8/1k6 w - - 0 1"] 1. Qf5+ Qde4 2. Qf1+ Qe1 3. Qd3+ Ka1 4....
Niklas's user avatar
  • 457
7 votes

How far from solving chess are we?

Not only are we far from solving chess, in all likelihood chess will never be solved. There are more possible positions in chess than atoms in the known universe, so not only would in take forever (...
chessprogrammer's user avatar
6 votes

Longest way to mate with 1 queen against 4 queens

The best I could come up with is 7 moves, I don't believe it could take much longer, because with 4 queens there's not as much freedom as with 2, I cannot put black king in the middle of the board ...
lenik's user avatar
  • 1,726
6 votes

What is the status for seven man end game table bases?

7-men Syzygy tables are available for download: ftp://ftp.chessdb.cn/pub/syzygy/ Mirrors: http://tablebase.sesse.net/syzygy/ https://tablebase.lichess.ovh/tables/standard/ As of August 2018, only ...
user16979's user avatar
  • 151
6 votes

Is there an online database for the endgame KRPPKRP?

All of the Syzygy tablebases are available here: https://syzygy-tables.info/ These cover all endgames up to 7-man, and provide WDL (win-draw-loss) and DTZ (distance to zeroing move) data. Syzygy ...
Chromatix's user avatar
  • 1,679
6 votes
Accepted

Does the Lomonosov Tablebase (and others) include extra material positions such as KQQvKQQQ?

The Lomonosov Endgame Tablebase supports 7 pieces. That means it has all the positions you describe in your question. Otherwise, it's not a tablebase by definition. The "ridiculous" positions you ...
SmallChess's user avatar
  • 22.5k
6 votes
Accepted

Is it possible to get DTM of a position from sygyzy tables?

No. It's not possible. People use Gaviota tablebase if they want to do DTM or the old Nalimov. Syzygy tablebase is the most popular tablebase algorithm because it doesn't do DTM, better compression. ...
SmallChess's user avatar
  • 22.5k
6 votes

Has Explainable AI been applied to the endgame tablebases?

In short: yes. Although I don't have an overlook on current research. But already with the endgame KR/K, which is as much the drosophila of tablebases as chess is for KI, was handled this way, and for ...
Hauke Reddmann's user avatar
6 votes

Why hasn't any new endgame theory been developed from the endgame tablebases?

Endgame complexity scales super-exponentially with the number of pieces. This is why each successive N+1-piece tablebase takes so much more computing power than N-piece tablebase. This isn't merely a ...
Cleveland's user avatar
  • 7,584
5 votes

How far from solving chess are we?

We are very very far from solving chess. We would need a 32 man tablebase for that. Currently, we have a 7 man tablebase. Each increase of 1 step, requires exponentially more computing power and ...
zaifrun's user avatar
  • 227
5 votes

Are there attempts at creating practical endgame tablebases?

It is difficult to define the exact boundary of practical vs. impractical. However, you can define this for yourself. See this project You can decide what you want to generate like: rtbgen ...
Michael West's user avatar
  • 5,196
5 votes
Accepted

What is the longest tablebase win that includes draw rules?

Unfortunately looking for the longest mates on Kyrill Kryukov and checking with Syzygy won't give you the answer. The mate lengths ignoring the 50 move rule don't correspond with the mate lengths when ...
Martin Rattigan's user avatar
5 votes

The state of chess when it becomes solved (or nearly solved)

For the average player, not much changes. The problem is: Even if you can get to that exact position 24 moves deep in an actual game, and even if you know that 25.dxc6 leads to mate in 105, you have ...
D M's user avatar
  • 19.3k
5 votes

Table bases: an endgame challenge

You can download the tablebases from the Syzygy website.
Matija Sirk's user avatar
  • 2,338
4 votes

Is there an online database for the endgame KRPPKRP?

The 7-men databases from Lomonosov are available for free via their Android app. I've analyzed the traffic between the app and server a while ago, and discovered that it's easy to 'fake' your own ...
Glorfindel's user avatar
  • 24.8k
4 votes

Is there a freely available online 7 piece Endgame tablebase?

https://syzygy-tables.info/ allows to look up 7-men endgame positions. It does not give DTM information for 6- and 7-men endgames, only DTZ50+. On one hand, it is compliant with 50-move rule, OTOH, ...
user16979's user avatar
  • 151

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