For example, if you’re betting on teams A, B, and C to win outright, you’ll have two round robin options available. Your By 2’s option includes all possible 2-team parlays for these three wagers (A+B, B+C, and A+C). And your By 3’s option includes all possible 3-team parlays on these 3 wagers (A+B+C). If you wager $30 on the By 2’s option, that money will be split evenly among the 2-team parlays ($10 on each of the 3 wagers).

In this game between the Boston Celtics and the Dallas Mavericks, you’re given the option to bet on either team. Going into this game, you know that Mavericks are favored to win. If the sportsbook didn’t adjust something (the line or the payouts), everyone would bet on the Mavericks, and no bets would come in on the Celtics. If the Mavericks were to win, the sportsbook would be out of money and have to shut their doors.
Baseball, soccer, and ice hockey are mostly moneyline betting, since these sports do not have point spreads moneylines are the default way of wagering. Football and basketball do have moneylines in addition to point spreads. In recent years, football moneylines have become extremely popular among sports bettors. Moneyline betting is based on the amount bet per $100. Let’s look at look an example of a baseball moneyline:
As you may already be assuming, adjustments are made if you want to bet on the Razorbacks. The point spread for the Razorbacks would be set at +7. It will always be the exact opposite of the other team. As the negative sign represents the favorite, the plus sign here represents the underdog. If you were to bet on the Razorbacks, they can actually still lose, and you win your bet.

On the other hand, underdog moneylines can be lucrative wagering opportunities. Upsets happen more often than some of us think and moneyline betting is a great way to take advantage. For example, for a moneyline wager of +250, a bettor will only need to win about 28% of the time to break even and for a +300 wager the bettor would only need to win 25% of the time to break even. If you can spot upsets even decently well, moneyline wagers on underdogs can be profitable bets.
Oftentimes you’ll see a point spread that has a half-point added to the number. Of course, there’s no such thing as half a point in a football game, so why do we so often see point spreads with a (.5) attached to the score? Sportsbooks do this to make sure there isn’t a chance of a push.  Let’s take another look at our game from above with the half point added.