The Nadanian Attack is a variation for white to attack the Grunfeld Defense. It starts with the moves:
It takes some of the normal chess rules that most people are taught about the end game, and throws them out of the window. But there is a good reason for that, and white can gain an advantage by breaking some of the rules.
After 5. Na4, white has gone against two key concepts in chess. 1) Don’t move a chess piece multiple times in the beginning of a game. 2) Don’t put your knights on the side of the board. They should control the center of the board.
The good news is that white is preparing 6. e5. Black normally would respond with Nxc3 but the white knight is not on c3 like it normally is in the Grunfeld. So black is forced to play outside their comfort zone. White controls the center of the board and can easily get the knight on a4 back in the game at any moment.
To watch an overview of the Nadanian Attack you can check out the video below.