As a fan, you don’t care if your team wins by a point or 100. A win is a win, though that 100-point win would be a little easier on the nerves.

• Odds Plus Minus Meaning Prefix
• Basketball Plus Minus Meaning

In sports betting, how much a team wins by is usually all that matters.

The most popular way to bet for the two most popular sports, basketball and football, is with the point spread, also known as the “side.” Most baseball, hockey and soccer bets are on the moneyline, which is betting on a team to win straight up with adjusted odds. Football and basketball have moneyline bets available too, but most people will take the point spread.

The concept can be a bit confusing if you’ve never dabbled in sports betting before.

A minus sign means that the team is expected to win. The higher the number following the minus, the bigger are the chances of that team winning. Now, with the plus sign, it’s the opposite. The bigger the number following the plus, the lower are the chances of that team winning. The form American odds (or lines) take is a plus '+' sign or a minus '-' sign in front of a number. For example, the line on the New York Giants to win the game against the Green Bay Packers is '-150', while the odds on the Packers to win are '+230'.

Why bet with the point spread?

The point spread was created to attract more action on a game. When the San Francisco 49ers are expected to blow out the Arizona Cardinals, it’s not enticing to lay $300 to win $100 on a moneyline. But when the 49ers are 11-point favorites and each side is -110 odds? That’s much easier.

In that example, the 49ers are spotting the Cardinals 11 points before the game starts, at least for bettors. The 49ers have to win by 12 or more points to cover the spread. If the Cardinals win or lose by 10 or less, that side wins the bet. If the game lands on 11, like a 21-10 49ers win, it’s a push and all bets are refunded. If you see a -11 that means that team is favored, and +11 means you’re taking the underdog.

Nothing sharpens your math skills better than trying to figure out how big your lead as a bettor is if you have a 22.5-point basketball underdog that is losing 90-72.

The problem with the point spread can be when a team — which really doesn’t care that you bet the favorite at -11 — has a 14-point lead but gives up a meaningless score at the end to win by only seven points. They’re still happy with the win. You, as a bettor, are not.

Point spreads lead to bad beats

Odds Plus Minus Meaning Prefix

The most infamous example of a bad beat with the point spread probably came in the 2004 Final Four at the NCAA men’s basketball tournament.

Duke was a 2.5-point underdog against UConn. The Huskies rallied late and took a 79-75 lead on a free throw with 3.2 seconds left. The game itself was over; Duke couldn’t score twice in a few seconds. But Duke guard Chris Duhon pulled up for a running 3-pointer just over the half-court line and banked it in at the buzzer. Duke lost 79-78, but bettors who had Duke and 2.5 points won. March Madness is a huge event for bettors, and reports at the time estimated that Duhon’s “meaningless” shot resulted in a $30 or $40 million swing in Nevada. UConn players celebrated at the final buzzer. UConn bettors doubled over in pain. That’s the difference between betting the moneyline and the point spread.

Baseball and hockey have point spreads too, the “run line” in baseball and “puck line” in hockey. It’s generally 1.5 with odds adjusting accordingly. Taking a big baseball favorite at -1.5 runs can make the odds more palatable. Of course, betting the New York Yankees at -1.5 to bring down the odds from -190 to -110 isn’t too fun when they win 4-3 and you don’t cash a bet.

Basketball Plus Minus Meaning

Betting on the point spread is the most common way to wager on sports. And the first time you take a favorite that wins the game but doesn’t cover the spread, you’ll understand every bettor’s heartbreak.