You should be able to spot the common theme: White has occupied the center with the d-pawn and has advanced the g-pawn to g3 (with the object of fianchettoing the Kingside Bishop). This hypermodern idea is usually attributed to Savielly Tartakower. However, the basic position can be reached via transposition from other openings, primarily the English.
The Catalan Opening from the Indian Games branch, is a somewhat unusual opening designed to avoid the Nimzoindian and Queen's Indian Defenses. Garry Kasparov used it in a match against Korchnoi in the 1980's. It usually leads to a draw game.
These series "Master the Hypermodern" are brought to you if you want to learn the Hypermodern school. It'll feature 14 openings, with intent for better understanding of positional play, what is Modern chess and to get profound knowledge of hypermodern openings and sub-variants
Good luck and enjoy the games

Hi all thanks for participating, just to notify you all next tournament will be about Queen gambit, have fun