Chess Assistant 25

Chess Assistant 25 is a unique tool for managing chess games and databases, playing chess through the Internet, analyzing games, or playing chess against the computer. Chess Assistant 25 includes grandmaster level playing programs, Chess Opening Encyclopedia mode, a powerful search system, the unique Tree mode, databases of about 9.38 million games in total.

Stockfish 17 – The World Rating Lists Leader
Chess Assistant 25 auto-installs the strongest chess engine Stockfish 17, in addition to the good old Rybka 4 that comes with the package. Stockfish is leading in most independent computer chess rating lists. No serious chess player can be without Stockfish!

Opening Studies – Stay Organized with Opening Tables
Chess Opening Encyclopedia contains rich theoretical material on all openings. It contains over 8.000 annotations from GM Kalinin and 40 million evaluations by the strongest engines. The detailed key system for all openings can be edited to suit your needs.

Opening Tables is a revolutionary way of creating, maintaining and studying your opening repertoire. Base your studies on the Opening Encyclopedia, customize it with your own moves and evaluations, enhance your favorite variations or create your own private opening repertoire. Working on your opening repertoire finally becomes the creative and enjoyable task it should be! Opening Test Mode allows you to test your knowledge and skills in openings.

Analysis – Automatic, Manual and Background Analysis
Infinite analysis offers a wide range of options to customize the analysis to your needs

- Include/exclude selected moves from analysis
- Multivariation and adjourned multivariation mode
- Analyse simultaneously with several different chess engines
- Check moves in game or annotations
- Search for additional moves
- Analyse position from both sides at the same time
- One or two-panel display of analysis

Database Search – Standard Searches & CQL
Standard searches. When it comes to searching, you will not find a more powerful system than Chess Assistant. It offers all the types of standard searches you would expect for a chess database

- Search by position, header, maneuvers, material, comments, etc.
- Novelty search
- Advanced search with simultaneous specification of material in 12 regions on the board

Databases and Game Service
Chess Assistant 25 includes two databases of 9.38 million in total

- HugeBase database (as of December1, 2024) - 8.4 million games
- Correspondence database - 596 000+ games.

Classifiers – Organize Your Chess Data
A database of chess games is a rather unwieldy collection of data. Of course you can sort the games, search etc. but all of this is temporary. The next time you open the database you will see the same list of games without any useful structure. If you want to repeat a search, you have to enter all the search criteria from scratch and then search again.

Classifiers allow you to organize your chess data into nested folders in a similar way as you organize your hard disk into folders. Each folder in a classifier can contain

- Icon. The icon serves as a reminder for the data contained in the folder.
- Text. A text description of the folder.
- Position. This could for instance be a critical position from an opening.
- Any search criteria, which allows games to be automatically classified with just a mouse click. This is of course a very powerful feature. An example is a classifier for endgames (pawn endgames, rook endgames etc.). Whenever you update your database, all you need to do is refresh the search in order to classify the endgames that occur in the new games.
- A list of games. Games can be included in the list either manually or automatically based on a search criteria.
- Chess tree. You can store chess trees in a classifier folder. This could for instance be detailed analysis results for an opening variation, while only the most important variations are shown in a game annotation.
- Another classifier, allowing practically unlimited flexibility in the structure of classifiers.
- Multimedia information: images, audio and video.

Chess Trees – State of the Art
Chess Assistant offers state of the art chess trees

- Transpositions are automatically detected
- New trees can be created from any collection of games
- Detailed information is displayed about positions: Human evaluations, computer evaluations, and various statistics
- Games can be annotated automatically based on information in a tree.

Game Annotations and Global Annotations
Chess Assistant supports all types of game annotations, from simple text to multimedia content

- Add and manage variations (promote etc.).
- Powerful annotation editor makes it easy to add Chess Informant symbols, engine evaluations and verbal commentary.
- Assign visual styles to moves so they stand out in the notation. You can search for games based on styles.
- Use any of 30 standard classes to classify important games or instructive positions. The same game can belong to multiple classes (e.g. Tactics and Kingside attack). Search for games belonging to specific classes.
- Organize games with a flexible, user defined, Windows Explorer style Classifier.
- Display board graphics and insert diagrams at selected point in the notation.
- Add multimedia annotations (images, video and audio) to moves.
- Reference games can be inserted from a database, and endgame information from tablebases. All of this can be done manually or through any of the automatic game analysis methods.

Playing Features
If you want to play a game of chess against the computer, Chess Assistant offers a variety of engines and options

- Wide selection of time controls and other playing options
- Handicap engine included (Dragon)
- DGT board support with voice announcement of moves
- Powerful opening book editor allows you to adapt the opening choice of the chess engine to your needs.

Database Compatibility: Chessbase and Chess Assistant
Chess Assistant supports all the most popular chess database formats, which means that your current database can most likely be used in Chess Assistant

- Chess Assistant’s own efficient database format (CDP)
- Chessbase (CBH, readonly)
- PGN (Portable Game Notation)
- EPD (Extended Position Description)

Optionally you can open and save databases in Zip-format in order to save space and conveniently send and receive databases by email.

Strong Chess Engine Support
Chess Assistant is compatible with most modern commercial and free chess engines. It supports a variety of protocols for communicating with chess engines, such as UCI, UCI2, WinBoard and MCS. In layman terms, this means that Chess Assistant gives you an unparalleled choice of chess engines for analysis and play.

- Support for all popular engines
- Winboard support – Ruffian and Crafty are included, built-in support for over 50 others, available via free download
- Hundreds of chess engines to choose from, including specialized mate solvers. Most of them are available via free download
- Automatic test set processing with comprehensive reporting features.

System Requirements
256 RAM, 4 Gb, Windows XP/Vista/7/8/10/11

Supported Languages
English, German, French, Spanish, Italian

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