Chess - London System is an educational app designed to help chess enthusiasts improve their skills and knowledge of the London system. Developed by Maksim Kolosov, this app offers a selection of interesting tactical puzzles and chess games that focus on chess openings, middlegame playing ideas, strategy, and tactics.

The free version of the app features 30 puzzles on combinations with victory, achieving advantage, and checkmating in several moves. Each puzzle provides the opportunity to watch the entire chess game from which the problem was derived. For those looking for more challenges, the full version of the app offers 322 tasks to solve.

The puzzles are categorized into 4 groups based on how black tries to counter the London system. It's worth noting that all the games in this app showcase victories achieved by chess players playing with white pieces.

Chess - London System is a great tool for chess enthusiasts who want to enhance their understanding of this particular opening strategy. Whether you're a beginner or an experienced player, this app provides a valuable learning experience.