Houdini Aquarium 2019 & ChessOK Aquarium 2021
ChessOK Aquarium 2021 is a new powerful analysis, database and chess publishing tool, powered by the world's strongest chess engines and 7-piece Lomonosov Tablebases.

ChessOK Aquarium 2021 €35.95
Houdini 6 Aquarium 2019 €53.95

ChessOK.com » New offer: buy 3 chess books for the cost of 2
New offer: buy 3 chess books for the cost of 2 19 September 2010
Order any two books costing more than $15/€12 in our online chess shop and get a third book of your choice (in the price range of the first two) absolutely free. ChessOK has a variety of books on different topics: tactics training, strategy, certain openings, biographies, etc.

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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