Swiss army knife for chess file formats

build status crates.io documentation Crowdin downloads dependency status stability-beta license

This is jja, a command line utility to interact with various chess file formats. It is still in its early stages of development. The initial intention of the author was to convert their opening books which were saved with ChessBase's proprietary CTG format to the free and open PolyGlot format. Overtime they intend to add support for other chess file formats ( cbh, epd, pgn, si4, si5 and so on).

Formats

As of version 0.3.1, jja supports reading/querying:

opening book files, whereas it supports writing/converting to:

opening book files.

During opening book conversion, jja uses the information provided in various input opening book formats to come up with a move weight which accompanies the move in the PolyGlot opening file. jja also writes some custom numbers in the learn field, such as NAGs during ctg conversion or priority during abk conversion. You may disable this custom usage using --no-learn as it may confuse other software making use of this field.

Note, Arena, aka abk, opening book file writing support is only supported from ChessBase, aka ctg books. Use the command line flags --author, --comment, --probability-priority, --probability-games, --probability-win-percent to configure ABK header metadata. Game statistics (minimum number of games/wins, win percentages for both sides) are managed automatically by jja.

In-place editing for Arena opening books is also possible using -i, --in-place=SUFFIX command line option. Conversion from PolyGlot, aka bin, and ChessMaster, aka obk opening books to Arena, aka abk opening book files is planned for a future release.

PGN Book Making

Since version 0.4.0, jja can make PolyGlot books out of PGN files. This feature is similar to polyglot make-book with the following differences:

  1. jja may directly read compressed PGN files .pgn.{bz2,gz,lz4,zst}
  2. jja can process PGN files bigger than your system's available memory, by persisting statistics in a temporary RocksDB database.
  3. jja scales move weights by default to prevent potential overflows with huge PGN files bigger files, use --no-scale to disable.
  4. jja can filter moves using Filter Expressions, allowing the user to filter-out unwanted games and create specialised opening books.

Filter Expressions

The filter expression string should contain filter conditions, which consist of a tag name, a comparison operator, and a value. The following operators are supported: - > (greater than) - >= (greater than or equal to) - < (less than) - <= (less than or equal to) - = (equal to) - != (not equal to) - =~ (regex match, case insensitive) - !~ (negated regex match, case insensitive)

Filter conditions can be combined using the following logical operators: - AND (logical AND) - OR (logical OR)

Example:

--filter="Event =~ World AND White =~ Carlsen AND ( Result = 1-0 OR ECO = B33 )"

Supported tags are Event, Site, Date, UTCDate, Round, Black, White, Result, BlackElo, WhiteElo, BlackRatingDiff, WhiteRatingDiff, BlackTitle, WhiteTitle, ECO, Opening, TimeControl, Termination, and ScidFlags.

In addition to these are four special variables, namely, Player, Elo, Title, and RatingDiff. These variables may be used to match the relevant header from either one of the sides. E.g the filter:

--filter="Player =~ Carlsen"

is functionally equivalent to

--filter="( White =~ Carlsen OR Black =~ Carlsen )"

Note: The filtering is designed to be simple and fast. The tokens, including parantheses are split by whitespace. Quoting values is not allowed. For more sophisticated filtering needs, use pgn-extract.

Scid Flags

Scid uses one character flags, DWBMENPTKQ!?U123456, for each field where: - D - Deleted - W - White opening - B - Black opening - M - Middlegame - E - Endgame - N - Novelty - P - Pawn structure - T - Tactics - K - Kingside play - Q - Queenside play - ! - Brilliancy - ? - Blunder - U - User-defined - 1..6 - Custom flags

It is ill-advised to rely on the order of the characters flags.

Use a regex match if/when you can.

Tips and Tricks about PGN Book Making

  1. The defaults run best on my laptop and in my personal benchmarks on the SourceHut build server, they're not universal truth.
  2. jja processes input PGN files in parallel. You can use this to your advantage by giving many split PGNs as input to increase parallelism and performance.
  3. Increasing batch size is good as long as you have constant memory usage. When threads can't keep up, you'll get increased memory usage so that's the point you really know your limit.
  4. Try increasing max open files to the point you don't get too many open files from your operating system. You may specify --max-open-files=-1 to keep files always open.
  5. Try different compression algorithms for the temporary RocksDB database, or try disabling compression completely if you have enough space. jja writes the temporary RocksDB database in the same directory as the first pgn file argument. The default compression algorithm, Lz4, and the default compression level, 4, are aimed at speedy conversion with relatively moderate space usage. If you run out of space during conversion, try to use an algorithm like Zstd with an "ultra" level, ie. a level greater or equal to 20.
  6. Use filters which are processed during PGN traversal when possible. Due to the fact that these filters are matched before writing the game data to the temporary database, when use wisely, they may have a vast on impact space and memory costs and therefore improve overall performance. These filters are --filter=<expr>, --max-ply=<ply>, --only-white, and --only-black.

Install

To compile from source, use cargo install jja. This requires the Rust Toolchain to be installed. In addition you are going to need OpenSSL libraries on UNIX systems. Moreover you need liburing on Linux. If you're on a Linux system older than 5.1 or you are unable to install liburing for another reason, you may disable the feature by building jja with cargo install jja --no-default-features.

As an alternative, release builds of jja are hosted on chesswob.org for 64-bit Linux and Windows. These versions are signed by GnuPG, using key D076A377FB27DE70. To install, acquire the latest version from chesswob.org, verify the checksum and the GnuPG signature:

$> export JJA_VERSION=0.4.1 $> export JJA_FLAVOUR=glibc $> curl https://keybase.io/alip/pgp_keys.asc | gpg --import % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 13292 100 13292 0 0 13535 0 --:--:-- --:--:-- --:--:-- 26584 gpg: key D076A377FB27DE70: public key "Ali Polatel (Caissa AI) <alip@caissa.ai>" imported gpg: Total number processed: 1 gpg: imported: 1 $> for f in jja-${JJA_VERSION}-${JJA_FLAVOUR}.bin{,.sha512sum,.sha512sum.asc}; do wget -q https://chesswob.org/jja/${f}; done $> gpg --verify jja-${JJA_VERSION}.bin.sha512sum.asc jja-${JJA_VERSION}.bin.sha512sum gpg: Signature made Sun Mar 19 20:52:41 2023 CET gpg: using RSA key 5DF763560390A149AC6C14C7D076A377FB27DE70 gpg: Good signature from "Ali Polatel (Caissa AI) ... $> sha512sum -c jja-${JJA_VERSION}.bin.sha512sum jja: OK $> sudo install -m755 jja-${JJA_VERSION}-${JJA_FLAVOUR}.bin /usr/local/bin

Finally you may download the builds of the latest git version via the SourceHut build server. There're three flavours, windows, linux-glibc, and linux-musl. Simply browse to the latest build and download the artifact listed on the left. Note: these artifacts are kept for 90 days.

Usage

jja determines the type of the file using its file extension. Files with the extension .bin are considered PolyGlot books. Files with the extension .ctg are considered ChessBase books. Files with the extension .abk are considered Arena books. Files with extension .obk are considered ChessMaster books.

By default if the standard output is a TTY, jja will display information using fancy tables. Use --porcelain command line option to get the output in CSV (comma-separated values) format instead.

Demo

jja intro

Acknowledgements

Thanks to Steinar H. Gunderson, for publishing the CTG Specification, and authoring the remoteglot tool: The CTG probing code in jja is very directly ported from their C probing code, and the specification has been an enormous help in clearing up various rough edges. Thanks to Fabien Letouzey, the author of the original PolyGlot software: The PolyGlot probing, book making and merging code in jja is mostly ported from their respective C code. Thanks to Michel Van den Bergh, the author of pg_utils, a collection of tools to interact with PolyGlot opening books: The PolyGlot book editing code of jja uses many ideas and code excerpts from pg_utils. Thanks to Peter Österlund, the author of DroidFish: The ABK opening book interface code in jja makes use of ideas and code excerpts from DroidFish. Thanks to Jens Nissen, the author of ChessX: The CTG and ABK probing codes in jja use ideas and code excerpts from ChessX. Thanks to LiChess, the best chess website on the planet. The quote command of jja has a selection of quotes imported from the LiChess codebase. Thanks to Shane Hudson, the author of Scid vs. PC: The jja eco command uses the ECO classification which has been done by the Scid project. In addition, the PolyGlot editing code of jja uses ideas and code from Scid. Thanks to Marcus Bufett, the author of chess-tactics-cli: The chessboard displaying code in PolyGlot and ABK edit screens is borrowed from chess-tactics-cli.

License

jja is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Bugs

Hey you, out there beyond the wall, Breaking bottles in the hall, Can you help me?

Report bugs to jja's bug tracker at https://todo.sr.ht/~alip/jja/: 1. Always be polite, respectful, and kind: https://css-tricks.com/open-source-etiquette-guidebook/ 2. Keep your final change as small and neat as possible: https://tirania.org/blog/archive/2010/Dec-31.html 3. Attaching poems with the bug report encourages consideration tremendously.

Jin, Jîyan, Azadî

I've started hacking this on International Women's Day 2023, a day to honor the achievements of women and advocate for their rights worldwide. As a person of Kurdish heritage, I am particularly moved by the slogan "Woman, Life, Freedom," which has become a symbol of resistance against oppression and a call for equality. In the spirit of free software and free speech, I strive to contribute to the creation of a more just and inclusive society, where every human being is granted the freedom to express themselves and pursue their dreams. I also honor the memory of Mahsa Amini, whose tragic death reminds us of the urgent need to fight for women's freedom and safety.

More on Wikipedia, WikiPedia::Woman,Life,Freedom

ChangeLog

0.4.1

0.4.0

0.3.2

0.3.1

0.3.0

0.2.1

0.2.0

0.1.1

0.1.0