(Novice here)
Thanku for trying it out!!
Umm…so i followed the game shown in this video-
So basically, each player has 6 pieces from smallest piece to biggest.
G1 is smallest and g6 is the largest ( as I tried to visually show with the size of buttons 
)
The larger pieces can eat up the smaller pieces.
One exception in the game rule is that - The player cannot move the piece what he has already played on the board to somewhere else on the board.
Once a piece is selected, the user has to play it, else he will not be able to use that piece again.
Hope this helps…!