16 votes
Accepted

What are the biggest free chess game databases? Is it legal to download games from them?

FICS database Lichess database Million base 2.2 PGNMentor Is it possible to use this information for my own purposes Absolutely! Nobody has the copyright. Enjoy your machine learning adventure!
  • 21.8k
15 votes
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What is Syzygy tablebases?

Tablebases are databases of endgame positions, with few pieces left on the board (say a 5-man tablebase, which consists of all legal positions with 5 pieces on the board in total, including kings, say ...
  • 1,323
13 votes

Database of every possible move in chess

No, it would not be possible for such a database to exist. Calculating it would require an infeasibly large computer and the calculation would take so long that your computer wouldn't exist for long ...
12 votes

How do people use chess software to improve their practical skills?

I know that I, for one, have used them to tell me why a line not mentioned in the books is bad. Most books show you all viable lines of play and maybe a few dubious ones, but a book can't mention all ...
11 votes
Accepted

How can I get a collection of chess games with a 'Greek gift' sacrifice?

Something which might help here is Chess Query Language. Just like SQL does for relational databases, CQL can search in a database of chess games for positions/games which match certain criteria. I ...
  • 24.2k
11 votes
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Is testing an opening by having a computer play against itself viable?

If you're concerned about whether an opening is objectively good, then using computer games is a good approach. Computers don't play perfectly, but they are by far our best option. You could also ...
10 votes

Java Library for PGN parser

After reading a bunch of open source code, I just found out that most of them are relying on Chesspresso which is a solid Java Chess library that can handle move validation, PGN parser (what I was ...
  • 311
10 votes

How can someone find their Morphy number?

You'd have to find a list of players Morphy has played. Then, you'd research as many players who played each of those players. This can all be done by searching by player in a large database. ...
9 votes
Accepted

Are there any (free) games databases out there?

There is a pretty big one if you are willing to spend some 40 euro. This (Million Base 2.2) is the biggest free database I know of.
9 votes
Accepted

Generalise 'grandmaster games (...) castle opposite sides and the queenside players loses?' to finding games based on themes

Question: Is there a way I can search this up myself? Yes. There is a tool called CQL (Chess Query Language) which allows you to search a PGN file database of games for games that match some set of ...
  • 83.9k
8 votes

Is it legal to use a chess database in correspondence chess?

According to the official rules of the International Correspondence Chess Federation, you are allowed and encouraged to. It is regarded as learning an opening. Of course, there are different rules for ...
  • 3,363
8 votes
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What's the difference between SCID and SCID vs PC?

Shane's Chess Information Database (SCID) is a powerful Chess Toolkit, with which one can create huge databases, run chess engines, and play casual games against the computer or online with the Free ...
  • 4,404
8 votes
Accepted

Is there a database of endgame positions with known perfect play?

Yes, it is call Lomonosov table : link It is all the positions with 7 or less pieces and the whole answer is known.
8 votes

How can someone find their Morphy number?

I never heard of the 'Morphy number' until I read your post. I found that my Morphy number is 5. Here is how I did it. I started with Wikipedia After looking at the list I realized that my best ...
  • 4,509
8 votes
Accepted

Find an opening based on the position of one player only

Using my free, open source pgn-extract program you can specify a grep-like FEN pattern to be searched for in a PGN file of games. The program comes with a file of opening lines (eco.pgn) so a search ...
  • 1,646
8 votes

Find an opening based on the position of one player only

As kentdjb already noted, there is no variation with that exact position which has an ECO entry. But it happened in sub lines of some ECO codes. I did a search on this database (only contains GM games ...
7 votes
Accepted

software to analyze my own database of games with statistics

There are quite a few programs - commercial (Chessbase, Hiarcs) or free (ChessX, Scid, Scidb, ChessDB, Arena). More or less, all will provide what you need. I personally prefer ChessX (under MacOS ...
  • 246
7 votes

Are there any (free) games databases out there?

These databases could be interesting for you: The Week In Chess (=TWIC) (free): updated every week, PGN format Mega Database of ChessBase (commercial): requires the ChessBase gui Huge Database of ...
  • 5,488
7 votes
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Personal chess database

SCID does everything you are looking for, it's great chess database software.
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7 votes
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What is a chess database used for?

what is that database, really? A chess database is basically a collection of chess games, i.e. a collection of moves with metadata such as player names, date, Elo rating of players, place, opening ...
  • 20.5k
7 votes

Game databases vs. various languages/character sets

You don't need good English to play chess... https://tieba.baidu.com/p/5369964903 is Baidu (China's larger search engine) page on chess. Do you see? The Chinese know Nxf2, Qxe3+, Bg3. The ...
  • 21.8k
7 votes
Accepted

Free opening name database?

There is an "eco" GitHub project available which I believe, based on the name, is based on the Encyclopedia of Chess Openings. This project used to provide a JSON file with all openings, but now ...
  • 10.3k
7 votes
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What are the percentage rates for each promotion type?

Here are the percentages for each promotion type according to different sources: |Promotion type | ChessBase | TWIC | ICCF | -------------------------------------------- | Queen | 96.9 |...
  • 3,253
7 votes
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FIDE database used for calculating current ELO

Is there somewhere the database FIDE use for calculating ELO rating of players? Yes and No. FIDE have such a database and they let us see some of the data but not in an easily downloadable form. For ...
  • 83.9k
6 votes

What is the average length of a game of chess?

We can make a small analysis from a theoretical point of view: Let us call 'n' the number of pieces on the board. In a match between players of similar strength, it is expected to find ~n/2 pieces ...
  • 409
6 votes

Database of every possible move in chess

I think Daniel's answer is excellent (+1) but want to add a few thoughts anyway. Would a 32-piece tablebase really replace chess engines? The answer is definitely no! To play good chess, more ...
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 ...
  • 1,669
6 votes

What are examples of grandmaster games where both Black and White castle opposite sides and the queenside players loses?

That's a pretty typical scenario, you'll find a lot of examples if you search for games in the sicilian opening. [Event "Sarajevo"] [Site "Sarajevo BIH"] [Date "2000.05.29"] [EventDate "2000.05.17"] [...
6 votes

Game databases vs. various languages/character sets

How do people use chess software in large countries like China, India or Russia, if they don't speak English, and more importantly, if they don't even know Latin letters? If they play FIDE rated ...
  • 83.9k

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