The beginner of the game (black) is in great favor.
Advantage of the game:
Simplicity.
The tournament rule
The 3rd move Black must make outside the
zone of 5x5 intersections with the same center as the center of
the whole board, the 5x5 zone is a prohibited zone.
The tournament rule decrease deferences between black and white.
The tournament rule + it additionally prohibits for 3rd move playing on the
4th and 5th intersections away from the center of the board that are on the same horizontal or vertical line.
The reason for the variation is to make the game more fair for second player
