Houdini Aquarium 2017 & Houdini PRO Aquarium 2017
Houdini Aquarium 2017 is a new powerful analysis, database and chess publishing tool, powered by the world's strongest chess engine Houdini 5 and 7-piece Lomonosov Tablebases.

Houdini Aquarium 2017 — $59.95 / €47.96
Houdini PRO Aquarium 2017, up to 128 cores and 128 GB of hash — $99.95 / €79.96

4 World Chess Champions

A new course package about the 4 most recent World Champions (Fischer, Kasparov, Anand, Carlsen) is available for the price of 2 courses.

The package includes over 7 500 games, more than 1000 of them with commentaries. Each course in teh package includes hudnred exercises Play like the GM and Play against the GM exercises.

Chess King 4 for Mac!

The revolutionary Chess King 4 with Houdini 4 software is now available for Mac, offering Mac users the strongest chess engine and rich training options in a friendly shell!

Chess King 4 Deep Pro is a new and versatile tool for chess players and is an ideal introduction for the beginner, a challenging opponent for the practiced amateur, and an invaluable coach for the aspiring master.

Video Introduction to CT-ART 5.0

A short video introduction to our recently released product CT-ART 5.0 Complete Chess Tactics (DVD, download) is now available on its page in our shop.

The video introduces the courses included in the package and shows the features of the Peshk@ interface.

More videos are coming soon!

Online Access to 7-man Tablebases!

Our new service providing online access to 7-man Tablebases on tb7.chessok.com until July 1, 2015 is now online! Using this service, you can access the tablebases from any device via a web interface, without having to use the Aquarium or any other software.

Other new features include position sharing, free 6-man tablebases, forum, tablebase statistics, saving positions as favorites and more!

Lomonosov Tablebases allow you to determine if any position with 7 or less pieces leads to a draw or can be won by either side - with 100% certainty.

If the game can be won, the path with the least number of moves until the end of this variation is shown, given that both players make the best moves possible. If the losing player makes a suboptimal move, he will lose sooner and the program will display the new optimal path.

Chess Assistant Standard Released!

Chess Assistant Standard has been released!

If you only need an affordable yet robust database management tool for club and intermediate players, Chess Assistant Standard is your program of choice! Comes with integrated Chess Opening Encyclopedia 2014 and more than 6 million games.

This version does not include Houdini 4, Premium Game Service 2014 and Lomonosov Tablebases access, but has everything else Chess Assistant has to offer.

Check the comparison table to find the perfect software for your needs.

Lomonosov Tablebases Online Access

Online access to Lomonosov Tablebases is open! Visit the service now or learn more about Lomonosov Tablebases.

For now only owners of Chess Assistant 14, Houdini 4 Aquarium and ChessOK Aquarium 2014 can use the service.

Users of ChessOK Aquarium 2014, Houdini 4 Aquarium and Houdini 4 PRO Aquarium can also access the tablebases directly from the Aquarium interface.

Chess Tactics in Benko (Volga) Gambit Released!

A brand new course, Chess Tactics in Benko Gambit (also known as Volga gambit) has been released both on DVD and for download! This course is aimed at club and intermediate players (thus gaining 25% off for this week’s special deal) and presents the theory and playing hooks in the most sharp and deciding variations of the Benko gambit.

The course presents a deep theoretical and practical overview of the actual variations. More than 170 new exercises provide a great opportunity to reinforce your knowledge.

Aquarium 2014 Update

To all ChessOK Aquarium 2014, Houdini 4 Aquarium and Houdini 4 PRO Aquarium users: an update for all products using the Aquarium 2014 interface has been released. New customers buying the download versions of these products do not need this update as it is already included.

The update adds an option to import IDeA projects and trees from the old format (.hsh) to the new one (.aqt). Fixes a number of critical bugs. Updating is strongly recommended.

To update your Aquarium software, download the file for your version (64-bit or 32-bit) from the Updates and Patches section and run it, then follow the instructions.

Study chess online on Chess King Learn! Time-proven training courses, thousands of examples and exercises.

Start playing right now in your web browser on Chess King Playing Zone! Teams, tournaments, training, analysis and much more!

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.

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