Game Anulled

What does game annulled mean? In my game history most of my games are annulled and I don’t even get what it means.

anulled games are treated as though they never happened. neither player loses or gains rank points. games are anulled when they end before a certain number of moves. this number is equal to the size of the board. for example: a 19x19 game is anulled if it ends before move 19 (for whatever reason).