Definition
Middling is betting both sides of the same game at different point spreads so both tickets can win if the final margin lands between the two numbers. The middle is the gap between your two spreads.
Basic math:
middle profit = profit on bet A + profit on bet B
split result = profit on winning bet - stake on losing bet
Worked Example
You bet Cowboys -3.5 at -110, risking $110 to win $100. Later, the line moves and you bet Giants +6.5 at -110, also risking $110 to win $100.
If the Cowboys win by 4, 5, or 6 points, both bets win. You win $100 on Cowboys -3.5 and $100 on Giants +6.5, for a $200 net profit.
If the Cowboys win by 7 or more, Cowboys -3.5 wins and Giants +6.5 loses. Net result: win $100, lose $110, for a $10 loss.
If the Giants win outright or lose by 3 or fewer, Giants +6.5 wins and Cowboys -3.5 loses. Net result: -$10.
Why It Matters
Middling helps when a bettor captures line movement and creates a range where both tickets cash. The value depends on the width of the middle, the odds paid, and how often the final margin lands in that range.