For example, -1 means 1 goal is given to the other team. (+) means the handicap advantage is awarded to this team and the number that follows represents the number of handicap goal(s). For example, +1 means 1 goal is given to this team.
It means that if a team who is the handicap favourite wins by two goals or one goal. For example you'd see team A (-1) draw (-1) team B (+1) , team A wins 1-0 or 2-1 by a one goal margin then the -1 draw would come through .