Chess - Sicilian Defense is an educational application designed to help users study the Paulsen variation of the Sicilian Defense system. The free version of the app offers 20 interesting puzzles that focus on victory combinations, achieving advantage, and checkmating in just a few moves. Upon solving each puzzle, users are granted access to watch the entire chess game from which the exercise position was derived. For those looking for more challenges, the full version of the app features a whopping 215 tasks.

One notable aspect of Chess - Sicilian Defense is that all the games in the app showcase victories by chess players who played with the black pieces. This provides a unique perspective and allows users to learn from successful strategies employed by black players. The idea, selection of chess games, and exercises were contributed by Maxim Kuksov from MAXIMSCHOOL.RU and Irina Baraeva from IRINACHESS.RU.