Imagine the home side leads 1-0 before the visitors score in second-half stoppage time. A 1-1 final wins the regular-time draw and both teams to score. There are still only two goals, so over 2.5 loses.
Home or draw (1X) and away or draw (X2) both include a 1-1 finish. Home or away (12) needs one team to win.
Add half a goal to the visitors for the handicap comparison. A level actual score is enough for the away +0.5 pick.
More leagues: Premier League, Soccer.