To show how this can be exploited, take a point spread of -8.5 at odds of -110. This is a 50/50 proposition. Let's assume you've purchased enough points to move the spread to -6.5 at odds of -150. Now, you'd win instead of lose 6.24% of the time they win by 8, and 6.59% of the time they win by 7. Add these together with the 50% from the original proposition, and we get 62.83%.
In today's world, patience is a virtue that very few people have left in them. We live in a world with lightning quick internet, instant message and in a world where fast food reigns supreme. People love getting instant gratification. In the sports betting world, that also holds true. It's one thing to sit through a three-and-a-half-hour football game between two mediocre teams only to suffer a bad beat on a completely meaningless last-minute touchdown that does nothing but affect the point spread and burn your ticket. Read More >>
A point spread, or “the line,” is a number set by oddsmakers to give an advantage to one team and a disadvantage to another team based on the margin of victory or defeat for the two teams. The favorite team is giving up points for purposes of the wager, meaning they not only have to win, but they have to win by X amount of points. The underdog team is getting points for purposes of the wager, meaning they can still lose the game, but they must lose by less than X amount of points.
The bookmaker functions as a market maker for sports wagers, most of which have a binary outcome: a team either wins or loses. The bookmaker accepts both wagers, and maintains a spread (the vigorish) which will ensure a profit regardless of the outcome of the wager. The Federal Wire Act of 1961 was an attempt by the US government to prevent illegal bookmaking.[2] However, this Act does not apply to other types of online gambling.[3] The Supreme Court has not ruled on the meaning of the Federal Wire Act as it pertains to online gambling.
For the player who wagers on San Francisco -5, San Fran must win by more than 5 points for this to be a winning bet. For the player who wagers on St. Louis +5, they must either win the game or lose by less than 5 points for this to be a winning bet. If the outcome falls on the number, the bet is declared a “Push” and your original stake amount gets refunded.
As you can see above, the combined score for Superbowl XLV was 56, and since this line was offered at reduced juice, a wager on the over at 44.5 of only $105 would yield a profit of $100. This line closed at a high of 46 points at some books, demonstrating how the public, who tend to show a proclivity for high scoring games, can increase an O/U line.
According to an article in The Times dated 10 April 2009, approximately 30,000 spread bet accounts were opened in the previous year, and that the largest study of gambling in the UK on behalf of the Gambling Commission found that serious problems developed in almost 15% of spread betters compared to 1% of other gambling.[7] A report from Cass Business School found that only 1 in 5 gamblers ends up a winner.[8] As noted in the report, this corresponds to the same ratio of successful gamblers in regular trading.[9] Evidence from spread betting firms themselves actually put this closer to being 1 in 10 traders as being profitable, with a high number of clients suffering from the volatility that is supposed to be one of the benefits of spread betting.[citation needed]
If you aspire to become an avid bettor and are serious about learning the trade, the first thing I recommend doing is to come up with several angles and legitimate reasons why betting on a specific team is going to make you money. I understand that angles and reasoning can only take you so far before what happens on the court or field is out of your control but playing the angles is a key part of sports betting that isn't going away any time soon. One of the better angles I look to play is a bet called the First Half Bet. Read More >>
The spread - The point spread is used in high-scoring sports like football and basketball. It is basically a handicap used to make all games competitive in the eyes of bettors. The spread gives one team an advantage of a few points. Standard notation for the point spread shows the favored team first, followed by a negative number (the actual spread). The home team is shown in capital letters. So if Buffalo was playing against Green Bay in Green Bay, and they were favored to win by seven points, it would look like this:

So how do you win? At the end of the first quarter, halftime, third quarter, and final score whatever the score is will be awarded to the person who owns that square. If the score is 17-10 at the half with the home team winning, the person with the squares of 7 and 0 would win that portion of the game. Having the squares 0 and 7 would not help because it would be assigned to the wrong teams. Usually the total money is divided by 5, and is paid out as follows. 1st quarter, Halftime, and 3rd quarter all get a 1/5 of the total bank and the Final Score doubles this to 2/5. So if you were involved on a $5 dollar pool and all 100 squares were filled that would be $500 to be paid out. With that number you would get paid $200 for final score and $100 for all other scores.
The most famous historic example of this is Super Bowl III when the New York Jets stunned the football world and upset the Baltimore Colts. The Jets were 18-point underdogs, still the largest point spread in Super Bowl history. They won 16-7, and people wondered what the oddsmakers had been thinking. Noted oddsmaker Bob Martin was later asked if he was embarrassed making the Colts such huge favorites. He said he was not because in what was then one of the heaviest bet sporting events ever, his number drew a fairly even amount of bets on both sides. This guaranteed a profit for the house.
The odds and lines for football games are not always the same at every bookmaker. They don't tend to vary by a lot, but they do vary. It's very much in your best interests to always try to place wagers where you can get the best value. A half point difference on a spread or a couple of points difference on the odds may not seem like a big deal, but over time these small differences can add up. By opening accounts with a few different sites, it's easy to shop around for the best odds and lines. This is one of the best ways to maximize potential profits.
The first number (56.5 in our sample line) is the book’s predicted total score, while the second number (110 in our Giants/Cowboys rivalry game) is how much a punter has to bet in order to win $100. If you were to bet the over-under on this game, you’ll have to decide whether you think the combined score of both teams will be higher or lower than the number put up by the book. Let’s say you bet the over, assuming the game will be a shootout between two talented offenses, you’re hoping that the final score will be anything that totals 57 or more. It could be Dallas 54, New York 3, or any other point combination that adds up to 57 or more and your bet will win. Betting the under means that the two teams cannot score more than 56 points combined, or else you lose your bet.

With some betting sites odds, certain games are priced differently than risking $1.10 to win $1.00 (which is called -110 odds). For example, you might see the Giants priced at -105 and +7 in a game against the Jets. Now, you only have to risk $1.05 to win $1.00. This is obviously better odds, but it's very likely that they will lose by exactly seven to give you a push. Taking -110 and +7.5 with an alternative bookmaker is actually the better bet.

Without a points handicap, it would not make sense to pay both sides of a wager the same amount when it's clear that not all teams are on equal footing. In fact, it is entirely possible for a team to lose the game in real-life but still win a bet if they only lose by less than a set number of points. Vice versa, a team can win a game, but lose the wager if they do not win by more points than what was predicted.
For example: New England –2.5 (–110) or Philadelphia +2.5 (–110) means you’d wager $110 for the chance to win an additional $100 if you bet on the point spread. Depending on which side is receiving the most action, a sportsbook will often move the line up or down in order to incentivize betting on the less popular side. Injuries or unforeseen changes can also impact a point spread gambling line. Point spreads are often listed with a half-point (ex: 2.5) in order to prevent the final margin from landing exactly on the point spread (ex: 10-point spread, final score of 20–10). A “push” or “tie” usually goes to the house or sportsbook, unless another arrangement has been agreed upon beforehand.

If the bookmaker was only confident enough to give Seattle a field goal’s lead on the Patriots, it was clearly going to be a tight game. Oddsmakers aren’t often that wrong about flagship games like the Super Bowl. All things being equal, it’s likely the betting public would have taken the Seahawks to win the game and have been done with it. But throw in the point spread that gave the Patriots 2.5 points, and the proposition seems more equal.
Football betting is by far the most popular form of sports betting by far.  Most professional gamblers only bet for 5 months out of the year because of this.  When you include College and NFL together there are almost a hundred games to bet on during a 2-day span. This is what is so appealing to the professional gambler; the action packed two days that comes every fall for five months.  The gambler has so much to watch in a 48 hour span that the rush alone makes these bets fun.  Now I do not expect you to go out and bet on every game played on a Saturday or Sunday.  However, I will outline below how you can bet on football also how to become more successful at football betting
The -110 listed is the actual odds given for these bets, and the odds determine how much you win based on the amount of your wager. This is why the odds are often called the price of a bet. When you see -110 odds, you need to bet $110 to win $100. Of course, you don't need to literally bet $110; that is just the ratio of the amount bet to the amount won. You can bet $11 to win $10, $20 to win $18.18, etc.
Money Line: More common in baseball and hockey, pro football moneylines are growing in popularity. There is no spread, so your team just needs to win the game, not win by a certain number of points. The negative value means a favorite (-190) and a positive one indicates an underdog (+170). Picture the number 100 sitting in between these two values. Example: if you want to pick a -190 favorite, you must risk $190 in order to win $100. To back a +170 underdog, you put up $100 and win $170 if the dog wins. In some cases, betting moneylines is actually better value and can provide a bigger profit for less risk.