Encyclopedia 3 by Informant is an educational tool designed for chess players with an ELO rating of 2400 and above. This program is part of the Chess King Learn series and focuses on chess combinations at an advanced level. The content is based on the bestselling book released by Chess Informant and offers a systematic approach to training.

With Encyclopedia 3, players can improve their chess knowledge and learn new tactical tricks and combinations. The program acts as a coach, providing tasks to solve and offering hints and explanations when needed. It also includes a theoretical section that explains game methods with interactive examples.

One of the advantages of Encyclopedia 3 is the high quality of the examples provided, all double-checked for correctness. The program offers different levels of complexity for tasks and allows players to set various goals to be reached. It also tracks the player's rating (ELO) during the learning process.

The application is available for iPhone and does not require an internet connection. It offers a test mode with flexible settings and the ability to bookmark favorite exercises. The program is also adapted to the larger screen of a tablet for a better user experience.

The free version of Encyclopedia 3 includes fully functional lessons that cover topics such as annihilation of defense, blockade, clearance, deflection, discovered attack, pinning, demolition of pawn structure, decoy, interference, and double attack. This allows users to test the application before deciding to unlock additional topics.

Overall, Encyclopedia 3 by Informant is a comprehensive and interactive tool for chess players looking to enhance their tactical skills and deepen their understanding of chess combinations.