Houdini Aquarium 2015 & Houdini PRO Aquarium 2015
Houdini Aquarium 2015 is a new powerful analysis, database and chess publishing tool, powered by the world's strongest chess engine Houdini 4 and 7-piece Lomonosov Tablebases.

Houdini Aquarium 2015 — $65.95 / €52.7
Houdini PRO Aquarium 2015 supports up to 32 cores and 32 GB of hash — $94.95 / €75.95

Weekly Offers from ChessOK!

From July 15 to July 28, the following special offers are available. All offers stack!

Products of the Week: 35% off Products of the Week - all products in the For Intermediate Players (download) section!

Special Offer 1: Buy ChessOK Aquarium 2016 this week and receive extra 6 months access to Lomonosov Tablebases (until December 31, 2017 instead of July 1, 2017).

Special Offer 2: Buy Chess Assistant 16 or Upgrade to Chess Assistant 16 and receive one-year membership in ChessOK Playing Zone!

Special Offer 3: Buy 3 World Champion courses (Anand + Kasparov + Fischer) at 50% off in our Combo Packages section! You can also find other 3-course packages there, available for half the price: Complete Chess Strategy (Chess Strategy 3.0 + Chess Guide for Club Players + Chess Guide for Intermediate Players), Complete Chess Opening (Opening Lab + Encyclopedia of Opening Blunders + How to Win Miniatures at Chess) and Complete Attack on the King (Attack on the King I + Attack on the King II + Advanced Defense)!

Special Offer 4: Buy Chess Assistant 16 (DVD, download), Chess Assistant 16 PRO (DVD, download) or Upgrade to Chess Assistant 16 (DVD, download) and choose any other product(s) from our shop for 35% of the cost of your Chess Assistant 16 or Upgrade to Chess Assistant 16 version.

Special Offer 5: If you order products for more than $120/€100, choose one download programs for up to $25/€20 each as a bonus!

Special Offer 6: Order any 2 programs in our web shop and get a 3rd program of your choice (within the price range of the first two) for free!

Note: Specify the bonus product(s) you want to receive in the comments field when filling the order form.

New courses for iOS!

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6 new courses are released for iOS devices - check them out in the App Store! Each course features tons of material sorted in a well-structured table of contents, top quality examples/exercises, hint system, progress tracker, flexible customization and more!

More courses for iOS are coming soon!

Chess Training Apps for iOS!

Chess: From Beginner to Club Player and 4 other training courses are now available on iOS devices - check them out in the App Store! Each course features tons of material sorted in a well-structured table of contents, top quality examples/exercises, hint system, progress tracker, flexible customization and more!

More courses for iOS are coming soon!

ChessOK Aquarium 2016 Released!

ChessOK Aquarium 2016 is now available in our shop!

ChessOK Aquarium 2016 is a chess playing and analysis environment, offering advanced analysis functions, game commenting, searching, powerful chess trees, playing, databases, 7-man endgame tablebases and much more.

What’s new in ChessOK Aquarium 2016:

  • Major improvements and optimization of the tree database subsystem, leading to faster and more reliable trees.
  • A new and powerful analysis feature, based on IDeA tree generation strategies. Pick one of the predefined strategies that come with Aquarium 2016, or create your own and generate trees based on any pattern you want. Read review by Dadi Jonson.
  • Queries to the online 7-piece tablebase server are processed much faster than in previous versions.
  • Both the 64-bit and the 32-bit versions now support DSN databases and iBook
  • Numerous other minor changes and fixes, for example, Ctrl-X hotkey deletes all “Sent to server” move markers in the game score.

Peshka Updated to 2.01

Peshka 2.0 has been updated to Peshka 2.01. The new version fixes all issues our users have reported, including login problems, and removes the need for admin rights during installation.

See Peshka 2.01 download and installation instruction.

If you already have Peshka installed, you can download the patch file and run it to update the program.

Buy or Upgrade to CT-ART 6.0 with Peshka 2.0!

CT-ART 6.0, the latest instalment of the renowned chess training program, is now available in our shop! If you own CT-ART 5.0 purchased in our shop, you can UPGRADE it to CT-ART 6.0!

With 2 new courses for beginners, 200 new teaching examples in the core CT-ART course and updated Peshka 2.0 interface, CT-ART 6.0 is the ultimate tactics training tool that can take you from the very basic principles to advanced, GM-level combinations! For this new edition, the material has been computer checked and revised.

The courses come in updated Peshk@ 2.0 interface that now accepts and gives points for suboptimal but still winning moves and supports multiple interface languages.

Courses in CT-ART 6.0:

  • Level 1 - Chess Tactics for Beginners (ELO 200-1400; 1200+ puzzles)
  • Level 2 - Elementary Chess Combinations (ELO 1000-1400; 5000+ puzzles)
  • Level 3 - CT-ART for Beginners (ELO 1400-1600; 150 examples, 1500 puzzles)
  • Level 4 - CT-ART. Mating Combinations (ELO 1400 - 2000; 1200 ex., 700 p.)
  • Level 5 - Chess Tactics Art (ELO 1400 - 2400; 200 examples, 2200 puzzles)

Chess King LEARN!

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The new Learn section on chessking.com features several FREE training courses on various aspects of chess, sortable by level of difficulty and general direction.

The courses are available in several languages - check the language box to the left of the course list!

  • Chess Strategy (1800-2200)
  • Chess Middlegame II - V
  • Chess Tactics Art (1400-1600)
  • Chess Puzzles Advanced Defense
  • Attack on the King II. Mating in 3 or 4 Moves
  • Chess Tactics Art (1600-1800)
  • CT-ART. Mating Combinations
  • Total Chess Ending (1600-2400)
  • Attack on the King I. Mating in 2 Moves
  • Complete Chess Course (1000-1600 ELO)
  • Chess Opening Blunders
  • Chess: From Beginner To Club Player
  • Chess Tactics for Beginners
  • Mate in 1 move (Chess Puzzles)

CT-ART for Android!

CT-ART is now available on Android - check it out on Google Play or Download Apk!

This excellent tactics course has been voted more than once by the chess experts as the best training program on chess tactics. CT-ART is an indispensable training tool for intermediate players sporting an advanced hint system - each position is accompanied with a similar one on a 5×5 board, demonstrating the main point of the example!

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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