The sportsbook is not going to have props conveniently labeled as “skilled NBA props” and “gamble, gamble props,” so it’s up to you to use your common sense to decide which bets you should be getting involved with and which you should be avoiding. Remember, unskilled entertainment prop bets are not bad as long as you know that they can’t be beaten long-term unless through sheer dumb luck.
In our earlier example, the sportsbook would be devastated if 100% of the action came in on the Falcons. The book is not looking to gamble; they are looking for a sure thing. So, to try and entice more people to bet on the Bear Cubs and discourage people from betting on the Falcons, they will alter the payouts. They will make the amount you win for correctly selecting the Bear Cubs much larger and the amount that you win for correctly selecting the Falcons much smaller.
Bets on "Race to X Points / Race to X Goals..." and similar offers refer to the team/participant reaching the earliest particular tally of points. If the offer lists a timeframe (or any other period restriction) it will not include any other points tallied from other parts of the event which are not related to the mentioned time frame. Should the listed score not be reached within the stipulated time frame, all bets will be declared void, unless otherwise stated.
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.
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The two results above are the no-vig probabilities. If you're sharp, you'll notice that adding 68.57% and 31.43% up together will give you 100%. The extra 2.95% has been removed, so there's no more vig. We can now go to our odds converter and enter 68.57% into the implied probability field. This will give us moneyline odds of -218. If we enter 31.43%, we'll get moneyline odds of +218. The original moneyline market of the Celtics at -240 and the Grizzlies at +210 therefore has no-vig odds of the Celtics at -218 and the Grizzlies at +218.
If the Cowboys are 6-point favorites, their odds are -6. If the Giants are 6-point underdogs, their odds are +6. From the oddsmakers' perspective, the Giants are starting the game with a 6-0 lead, while from the Dallas side, the Cowboys are starting with a 0-6 deficit. If you bet on the Cowboys and they win 34-30, they failed to cover the spread by two points. If you bet on the Giants, they beat the spread by two points.
This is a very common occurrence in sports betting and sportsbooks have the full right to shift the spread or odds for any given match prior to it starting. Many factors can influence a change of the spread such as injuries, the number of bets coming in for either team or the weather, to name a few. Depending on the timing of placing the bet, the bettor can also have an advantage or a disadvantage depending on which way the spread has shifted.