Build a hypothetical outcome table before comparing double-chance labels. Give a home win 40%, a draw 30% and an away win 30%. Home-or-draw covers 70%; draw-or-away covers 60%; either-team-to-win covers 70%. These three percentages add to 200%, because the events overlap. They are not three mutually exclusive outcomes like a home win, draw and away win.
The draw appears in both of the first two combinations; a home win belongs to the first and third. Adding the percentages as though only one combination could succeed counts the same result more than once. This table explains the labels using invented probabilities, without assessing this match or claiming any quoted price offers value.
