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

Chess Tactics in Sicilian Defense II Relased!

A new course from the Chess Tactics in the Opening series has been released!

Chess Tactics in Sicilian Defense II is aimed at club and intermediate players and presents the theory and playing hooks in the most sharp and deciding variations of the Sicilian Defense developing after moves 1. e4 c5 2. Nf3 Nc6.

The course presents a deep theoretical and practical overview of the actual variations, featuring 391 examples. Numerous new exercises provide a great opportunity to reinforce your knowledge: 412 exercises in total for all variations after 1. e4 c5 2. Nf3 Nc6.

Training with Peshk@: ELO 2400+ in two years

For everyone interested in improving their chess playing skills we highly recommend reading an article by an experienced Russian trainer Irina Mikhailova. There, she explores the possibilities computer technologies open, offers a detailed two-year plan for achieving ELO 2400 and gives advice on what courses work best for each stage of training.

Irina Mikhailova - “Modern methods in training chess players”

Chess Middlegame Collection 2013

Chess Middlegame Collection 2013 is a set of six unique chess courses. Five courses on the middlegame (Encyclopedia of Middlegame, volumes I-V) cover the theory and practice of the middlegame for each of the openings. The sixth course, Chess Strategy, explores 18 strategic motifs (Weak squares, Pawn structure etc.) and typical structures (Isolated pawn, Hanging pawns etc.).

Each of the six courses contains rich theoretical material for the corresponding openings and variations, and positions to solve. In total, the Chess Middlegame Collection 2013 includes more than 3000 games/lectures prepared by GM Alexander Kalinin and more than 4000 exercises to solve.

Chess Tactics in Slav Defense

Chess Tactics in Slav Defense and Chess Tactics in Kings Indian Defense are now available on DVD as well!

The Chess Tactics in Openings series currently consist of five courses. See them in our shop!

Chess King 3 MAX and PRO - with Houdini 3!

Chess King 3 MAX with Houdini 3 and Chess King 3 PRO with Houdini 3 Pro are released!

Check out the updated Chess King section of our shop for the full list of new products. Chess King 2 and 3 further develop and improves the original idea emphasizing simplicity and variety in training. 1500 puzzles, unique training modes, powerful Houdini 2 engine, huge databases, 1600 photos of chess players, multiple languages support and more!

Chess King 3 MAX includes the strongest chess engine Houdini 3, and Chess King 3 PRO has the even stronger version - Houdini 3 PRO, supporting up to 32 cores, 256 MB of hash memory and NUMA-architecture.

Chess Openings Encyclopedia 2013

Chess Openings Encyclopedia 2013 is released!

This excellent program for learning chess openings includes theoretical material on every opening, a user-friendly and detailed classification of variations, a quick search option and an option for analyzing games and positions.

Chess King 2 Released!

ChessOK announces the release of Chess King 2!
Chess King 2 further develops and improves the original idea emphasizing simplicity and variety in training. 1500 puzzles, unique training modes, powerful Houdini 2 engine, huge databases, 1600 photos of chess players, multiple languages support and more!
You can download Chess King now or preorder the upcoming DVD version.

If you already own the first installment of Chess King, you can upgrade it.

Lomonosov Tablebases Announcement

Dear owners of ChessOK Aquarium 2012, Houdini 3 Aquarium, Houdini 3 PRO Aquarium and Chess Assistant 13, Professional package.

Until December 31, 2013, you have free online access to 7-piece Lomonosov Tablebases via your Aquarium interface.

Currently, the tablebases available online include 200 most important endings. By the beginning of summer, you will receive access to all other 7-piece endings.

Please download and install Aquarium 2012 Update 2 to get access to the 7-piece endings.

Check out the quick guide for using Lomonosov Tablebases.

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.

More »