What is the Chess Tactics in Slav Defense game, how does it work?

According to the introduction of Chess King, Chess Tactics in Slav Defense is a Board game on the Android platform. There is currently a na version released on Nov 01, 2017, you can see the details below.

This chess course is aimed at club and intermediate players and presents the theory and playing hooks in the most sharp and deciding variations of the Slav Defense developing after moves 1. d4 d5 2. c4 c6.
The course presents a deep theoretical and practical overview of the actual variations, featuring 100 examples and 300 exercises to solve. The course will be useful to all chess players employing the Slav Defense on either white or black sides.

This course is in the series Chess King Learn (http://chessking.com/guide/android/), which is an unprecedented chess teaching method. In the series are included courses in tactics, strategy, openings, middle game, and endgame, split by levels from beginners to experienced players, and even professional players.

With the help of this course, you can improve your chess knowledge, learn new tactical tricks and combinations, and consolidate the acquired knowledge into practice.

The program acts as a coach who gives tasks to solve and helps to solve them if you get stuck. It will give you hints, explanations and show you even striking refutation of the mistakes you might make.

The program also contains a theoretical section, which explains the methods of the game in a certain stage of the game, based on actual examples. The theory is presented in an interactive way, which means you can not only read the text of the lessons, but also to make moves on the board and work out unclear moves on the board.

Advantages of the program:
♔ High quality examples, all double-checked for correctness
♔ You need to enter all key moves, required by the teacher
♔ Different levels of complexity of the tasks
♔ Various goals, which need to be reached in the problems
♔ The program gives hint if an error is made
♔ For typical mistaken moves, the refutation is shown
♔ You can play out any position of the tasks against the computer
♔ Interactive theoretical lessons
♔ Structured table of contents
♔ The program monitors the change in the rating (ELO) of the player during the learning process
♔ Test mode with flexible settings
♔ Possibility to bookmark favorite exercises
♔ The application is adapted to the bigger screen of a tablet
♔ The application does not require an internet connection

The course includes a free part, in which you can test the program. Lessons offered in the free version is fully functional. They allow you to test the application in real world conditions before releasing the following topics:
1. Slav defense - practice
1.1. Slav Defense (D10-D13)
1.2. Exchange System (D14)
1.3. Geller Gambit (D15-D16)
1.4. Czech System (D17)
1.5. Main Line (D18)
1.6. Euwe System (D19)
2. Slav defense
2.1. The "Karlsbad" pawn structure
2.2. The Schlechter system
2.3. The Botvinnik system
2.4. Systems with d5:c4
2.5. Chebanenko variation 4.. a6
2.6. The Meran variation
2.7. The Moscow variation

What's new in version na * Added Spanish translation
* Support subscriptions, you can buy subscription to all courses at learn.chessking.com
* Improved home screen design
* Improved refutations showing
* Various fixes and improvements