ChessOK develops high quality software for a wide spread of users: professionals, amateurs and young chess players. Below you can find detailed information about all of our software.
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Chess Assistant 13 with Houdini 3

Chess Assistant 13 Houdini 3 is a unique tool for managing chess games and databases, playing chess online, analyzing games, or playing chess against the computer.
Chess Assistant has a long history of innovative and advanced analysis functions and now, with a built-in CQL search system, it has also taken the lead in advanced search functionality.

The program comes in two packages: Starter and Professional, the latter one being a better choice for more dedicated players, as you receive the PRO version of Houdini 3 (which supports up to 32 cores and 32 GB of hash) and more additional tools, such as the advanced Aquarium interface.
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Chess Assistant 13 in our web shopChess Assistant 13 with Houdini 3 in our web shop.

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Houdini 3 Aquarium

Houdini 3 Aquarium is a revolutionary analysis, database and chess publishing tool, combined with the world’s strongest chess playing engine, Houdini 3. Houdini 3 Aquarium offers advanced analysis functions, game commenting, searching, powerful chess trees, playing against the computer, databases, advanced publishing features and much more.

Houdini 3 Aquarium includes the best chess engine – Houdini 3 UCI capable of supporting 6 cores and 4 GB of hash, a powerful search system, a unique Tree mode, database of 5.68 million games in total (as of November 1, 2012), a Bonus disk Chess Opening Encyclopedia 2012 and 1 Year membership at ChessOK Playing Zone.

Houdini 3 PRO Aquarium also includes Houdini 3 PRO UCI which can support up to 32 cores and 32 GB of hash. You can connect Houdini 3 UCI engine to Chess Assistant, Fritz and ChessBase.

Interactive Deep Analysis (IDeA) is the most advanced chess analysis method available today and is greatly enhanced in Houdini 3 Aquarium. The purpose of IDeA is to analyze a position deeply and return as much information about it as possible to enable the user to get a better understanding of the nuances of any position. Its approach makes it an essential weapon in the arsenal of every serious player and analyst!

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Houdini 3 Aquarium in our web shopHoudini 3 Aquarium for EU in our web shop.

Houdini 3 Aquarium for World in our web shop.

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ChessOK Aquarium 2012

ChessOK Aquarium is a revolutionary analysis, database and chess publishing tool, fully compatible with the world’s strongest chess playing engine, Houdini 3. ChessOK Aquarium combines an easy-to-navigate interface with advanced analysis functions, game commenting, searching, powerful chess trees, playing against the computer, databases, advanced publishing options and many other features.

One of its unique features, Interactive Deep Analysis, is the most advanced chess analysis method available today. The purpose of IDeA is to analyze a position deeply and return as much information about it as possible to enable the user to get a better understanding of the nuances of any position. Its unique approach makes it an essential weapon in the arsenal of every serious player and analyst!

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Buy ChessOK Aquarium 2012ChessOK Aquarium 2012 is an great chess interface combining advanced analysis functions, game commenting, databases, powerful chess trees, playing against the computer, and many other features. Read more.

Buy ChessOK Aquarium 2012ChessOK Aquarium 2012 is an great chess interface combining advanced analysis functions, game commenting, databases, powerful chess trees, playing against the computer, and many other features. Read more.


Rybka & Aquarium Rybka is the strongest chess engine and the computer world chess champion. Rybka family of products allows users to take full advantage of Rybka's power through effective and innovative analysis methods. Besides Rybka we offer new modern user interface, Aquarium, which was developed specifically for it. Aquarium Support Resource Buy Rybka Aquarium Rybka Aquarium 2011 – revolutionary analysis and database tool, combined with the world's strongest chess playing engine, Rybka 4. Aquarium offers advanced analysis functions, game commenting, searching, powerful chess trees, playing, databases and much more. Read more.

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Buy Deep Rybka 4 AquariumDeep Rybka Aquarium 2011 – multiprocessor (deep) version of the Aquarium. It also includes 4,600,000 game database. Read more. More products in the category (click to expand)
Modern Chess Opening Modern Chess Opening is a series of courses aimed at teaching a student most of the opening and middlegame methods and intricacies using both theoretical materials and practical exercises. Each course illustrates typical plans and methods in the opening. Each opening variation is supplied with evaluations and characteristic of the key moves. The theoretical material is nicely illustrated by classic games with detailed annotations that demonstrate the principal ideas of each variation for White and Black. Each courses also include numerous exercises for the student to solve, with numerous hints and to help you find the correct answer and recommendations based on mistakes. Buy Modern Chess Opening SetModern Chess Opening Set (vol.1-7) – This product features all seven volumes of Modern Chess Opening series, covering almost all chess openings. The series provide detailed classification and contain a lot of training material. Buy Modern Chess Opening 1: Open Games (1.e4 e5)Modern Chess Opening 1: Open Games (1.e4 e5) This course is aimed at teaching a student much of the opening and middlegame methods and intricacies through a theoretical section which includes 862 games/lectures each of them illustrating typical plans and methods. More products in the category (click to expand)
Training Courses ChessOK is proud to announce the immediate availability of Peshk@, the newest member of its training and improvement family. Peshk@ is a modern chess improvement and training tool from the developers of CT-ART, one of the most popular and respected tactics training programs.
Before purchasing a training course, please download our free graphical interface Peshk@ with demo versions of training courses and install it. (Manual in PDF)
Buy CT-ART 4.0CT-ART 4.0 – Finally a new and improved version of the legendary CT-ART has been released! This excellent tactics course has been voted more than once by the chess experts as the best chess training program. Buy CT-ART 4.0Opening Lab – This is a perfect opening manual. It features a theoretical review of all the chess openings, which are illustrated by instructive games of the greatest chess players. More products in the category (click to expand)
Pocket Software (Handhelds and Cell Phones; Java) As handheld devices have become more powerful they have also become more popular for playing and studying chess. ChessOK is already offering a range of products for these platforms. No fewer than 16 different programs are available. Many of them are training programs. Pocket Champion is an example of a chess playing program on the Pocket PC with a range of options. We even offer programs for mobile devices to play on the ChessOK internet server, The Playing Zone. Buy Pocket Chess Opening InstructorChess Opening Instructor – is an interactive tutorial for Pocket PC for intermediate players. This is a perfect opening manual. The program features a theoretical review of all the chess openings. Buy Chess Champion for SymbianPocket CT-ART – Pocket CT-ART is the first training program on chess tactics for Pocket PC. More products in the category (click to expand)
Opening Encyclopedias In this category we offer a general opening reference along with several products, each focusing on a single opening. These have been prepared by our chess masters, including GM Alexander Kalinin. Buy Chess Openings 2010Chess Openings 2010 – is an excellent tool for studying the openings, building opening repertoire and fast 4,200,000 games database searching. Buy Modern Chess Openings SetModern Chess Openings Set – This Set includes five excellent programs for five popular openings: Sicilian Defense, French Defense, Kings Indian Defense, Slav Defense, 1…Nc6!? The each program allows analyzing while playing against the built-in chess program Crafty as well as editing variations, searching for games in the database. More products in the category (click to expand)
Game Collections We have published several annotated game collections of the world champions. Buy Boris Spassky - 10th World ChampionBoris Spassky - 10th World Champion – This CD contains all the games of the 10th World Champion, one of the superior masters of attack in chess history. Grandmaster Alexander Khalifman thoroughly comments as many as 400 of the best games and attacks. Buy Alexander Alekhine - 4th World ChampionAlexander Alekhine - 4th World Champion – The annotations by Alekhine and his contemporaries've been revised and enlarged by IMs J. Ulko and A. Mitenkov. 600 games are commented for the first time!

7-man Lomonosov Tablebases provide deeper-than-ever insight into chess endgame.

Download weekly chess database updates (containing 2000+ games) with latest tournaments and games in PGN and Chess Assistant format.

Study chess online on our new dedicated website. There are many training courses and thousands of chess puzzles to solve.

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