Special circumstances may lead to special game ends. Scoring Go is a contest about sharing a go board. Play leads to a board position at the game end that is scored. Each player has a score that is measured in points. The difference of scores determines the win and the winning margin.
Sharing refers to the grid points of the board.
Each grid point is worth one point for scoring. The scoring operation is the sum. It is natural to consider all grid points for sharing. Rules that virtually do this are called area rules. During a game alternating play results in about an equal number of grid points with black respectively white colouring.