This application is designed to study the chess opening that begins with 1. g2-g4 and is named after the Swiss chess player Henry Grob.

The free version contains 15 interesting puzzles with victory combinations and achieving advantage. After solving each of them, the opportunity opens up to watch the whole chess game, from which the position of the exercise was obtained.
In the full version of the application, 150 tasks and games are waiting for you.