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Making a profit from betting is hard enough if you do everything right, but it becomes almost impossible if you make mistakes. Below are listed the most common mistakes that the average punter makes and avoiding these is the first step to becoming profitable in any form of betting.

Betting more than you can afford to lose

Even bookmakers don't want you to go broke. In fact, savvy bet takers understand that it's crucial for gamblers to win a fair share of their bets so that they're able to keep playing. A player without money is of no value to the house. The best way to preserve a sports betting bankroll is through the implementation of some well-disciplined strategy. One respected plan, called the "Kelly Criterion" after its author, John L. Kelly, advocates betting a fixed fraction of your bankroll on every play. Let's say you have a bankroll of 4,400 units and you decide to wager 5% of it on each play. Your first bet would be 220 units. If you win, you wager 5% of your new bankroll of 4,600 units, or 230. If you lose, you do the same, wager 5% of 4,180, or 209 units. A virtue of the Kelly Criterion is that since you're betting just a portion of your bankroll, you never can go broke!

Trying to "get even"

Get even for what, a day? A week? A month? A year? Your life? Money wagered and lost no longer belongs to the bettor so it's far more important to wisely invest the cash you have remaining than to chase the money that's already been lost. Each bet stands or falls on its own merits and no one wager ever should be viewed as a way to overcome past errors. Among other assets, bettors require discipline and maturity to be successful. It's inevitable that you're going to have some losing days. Deal with it. Don't chase!

Betting too much on one game

For the most part, professional gamblers bet about the same on every play. The reasoning is that a game either is good enough to play or it isn't. Sophisticated gamblers understand that there really is no such thing as a "lock" or a "best bet." A blown call of an official or a fluke occurrence can decide the outcome of an event. Dayjur was a "lock" to win the 1990 Breeders' Cup Sprint when he jumped over a shadow approaching the finish line and was beaten a neck by Safely Kept. Casual bettors often compound the mistake of wagering too much on one game with trying to get even, the first of our sports betting mistakes. Doubling or tripling up on the final game of the day in an effort to recoup the day's losses is a recipe for financial ruin. Bet more when you're ahead, not when you're behind.

Investing in a game just because it's on television

A pizza, a six-pack and a wager on the Monday night football game right? We get it! Look, we're not saying you have to replace the pizza with quiche, toss the brew in favour of diet soda or even forgo a bet but it might be a good idea to wager a quarter of what you usually invest on a game. Make a recreational bet if you must but save your serious wagering for those games you like for a reason other than their availability on TV.

Betting too few games

That's right, too few games. Conventional wisdom might advocate that you limit your action and carefully pick your spots but professional gamblers see it differently. "The fewer games you bet, the more your outcome is subject to luck," explained one sophisticated player who demanded anonymity. "You have to bet enough games so that a bad call, a crazy bounce or a freak play doesn't crush you. Anyone can lose one game, or two out of three games, but if you're a really good player, you know you're going to come out on top if your sample is large enough. The only way that happens is if you play enough games."

Going with the flow

There is no evidence that a point spread move signals which team is going to win the game. Sure, sometimes a football line moves from 1.7 to 1.3 and the favourite covers easily. "Smart money," claim the neophytes. But just as often the team getting the money does not cover the money. Truth is, "smart money" is smart only about half the time in sports betting. Don't be influenced by line movements.

Forgetting which is the better team

It may be fashionable to analyze reams of statistical data and examine a myriad of complex psychological factors but bettors often go astray because they fail to remember that the better team still wins most of the time. Every year, the majority of NFL and NBA teams with the best point spread records also are those teams that are among the leaders in win percentage. Sure, you can win a fair share of games by taking the points in certain situations but when favourites play well, because they're the better team, they usually cover. Or, to paraphrase Damon Runyon, "The fight isn't always to the strong or the race to the swift, but that's the way to bet."

Relying on technical trends

When you invest in a stock or a mutual fund you're advised that "past results are no guarantee of future success." That same caveat holds true for sports betting where a historical perceptive is interesting but hardly a harbinger of things to come. Besides, many of these so-called "trends" are nothing more than "back fitting," the fraudulent practice where a theory is developed to conform to a series of results rather than the accepted procedure where a theory is advanced and tested by results. Most successful sports betting analysts believe that each game must be evaluated on its own merits and that a reliance on technical trends is little more than an excuse for lazy handicapping.

Overreacting to the most recent performance

A good rule of thumb (or bankroll) is that a team never is as good as it looks after a victory nor as weak as it appears after a defeat. In other words, while more recent results do have more value, a single very good or a lone very bad performance should not be enough to wipe out a body of work. Thus, teams that are blown out one game often can rebound in their next game. Because good horses sometimes throw in a clinker or a mediocre horse occasionally fires on all cylinders, horse players, perhaps, understand this concept better than most sports bettors.

Thinking that offense alone will get the job done

You've heard it so often that it's become a cliché - Defence wins championships. Cliché or not, it's an accurate statement. If a team goes cold in basketball it can stay in the game if it plays staunch defence. In football, defence shortens the field, takes the ball away and creates opportunities for the offence to score easy points. In baseball, keep the ball in the park and out of the power alleys and you're always just a swing or two away from winning the game. Yet bettors often become falsely enamoured with offence, with much of their sports betting being done on teams that can score. The Pistons won last year's NBA title with defence and the Patriots captured their third Super Bowl in four years because they could stop their opponents. Even the Red Sox, who had a potent offence, finally won their first World Series in 86 years because they added pitching (starter Curt Schilling and closer Keith Foulke) and better infield defence to their roster.

Placing too much emphasis on injuries

Since the value of an individual player is indirectly proportional to the number of athletes who play at one time, the fewer the players, the greater the value of each player. Thus, the absence of a starter in basketball, where just five play at one time, is far more significant than when a football team, which has at least 22 starters, loses a player to injury. Of course, bookmakers are quick to adjust lines after an injury so the bettor rarely gains an advantage. In fact, because teams often compensate for the loss of a key player with more determination and effort, the gambler may be at a disadvantage if he places too much weight on the absence. What's more, the replacement player sometimes turns out to be just as good as the starter. Remember that Thurman Thomas' backup at Oklahoma State was Barry Sanders.

Making too much of psychology

Just because a team is highly motivated doesn't necessarily mean it will win. Effort counts, certainly, but it can't always overcome talent. And there's nothing that says that the American football team that won 50-0 last year isn't just as eager to duplicate that result as the team that was humiliated on the other end of that score is to reverse that outcome. Being too psyched up for an opponent can translate to overly aggressive play. In football, that can result in penalties, such as encroachment or offsides. In basketball, being too emotionally high can lead to fouls. In baseball, a player who fails to control his emotions may chase pitches in the batter's box.

While it's crucial to identify the right side in sports betting, in order to maximize chances for success, it's also imperative that the bettor has knowledge of wagering techniques and principles. A professional gambler put it another way: "If you're a great handicapper and an average bettor, you probably can't win. But if you're an average handicapper and a great bettor, you've probably got enough of an edge to win. The problem is, most people don't know how to wager."