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How the odds are formed in the bookmaker's line.
What are coefficients and how are they formed
Each coefficient reflects the probability of the corresponding event according to the bookmaker. Ideally, the sum of the probabilities of the outcomes of an individual event should be equal to 100% (or just one). Totals, the winner of a match in tennis is a two – way event, the winner in football is a three-way event (win 1, draw, win 2).

Coefficient – the inverse of probability.

K = 1/P, where K is the coefficient, P is the probability in the range from 0 to 1.

For example, if the chances of winning two tennis players are estimated equally (50% or 0.5), then theoretically the coefficients for their victory should be equal:

K1 = K2 = 1/0, 5 = 2

It is impossible to see such a picture in a real bookmaker's line, because it adds its own Commission to each probability. In betting, it is called margin.

Margin
Margin is one of the protection mechanisms that a bookmaker uses to keep the total of all bets in profit. This is a certain percentage that is added to the probability of each possible outcome.
Why are the coefficients in the line constantly changing
The influence of bookmakers on odds is not limited to calculating probability and adding margin. Otherwise all the values would remain unchanged from the moment of getting in line and before the start of the event. In fact, they change all the time.

The players themselves are primarily responsible for this. Of course, there are factors that do not depend on them. Such as an unexpected injury, firing of coaches and even the changing weather conditions. All this can theoretically affect the result, and therefore affects the probability of each outcome, from which the coefficient is calculated.

But the main contribution is still made by the activity of players. When the total amount of bets on a particular outcome begins to increase dramatically, the bookmaker lowers the coefficient. Accordingly, the opposite value / values increases.

This mechanism allows the bookmaker to protect itself from unnecessary expenses, reducing the total amount of payments in case of winning the favorite. However, it also works differently for different markets. For top Championships, only a large amount of bets shifts a number of related coefficients, while for unpopular events, even one large bet can significantly change the line.

For a long time I wanted to try my hand at sports betting, but I was afraid that I would lose all the money. I started looking for sites with lists of predictors' ratings in order to read the information. I found the 22bet site here they describe in detail all the questions of interest and the answers to them

They say that sport for real men is hockey, but compared to rugby competitions with the puck and stick, they nervously smoke aside. Rugby is a tough and traumatic sport, and at the same time spectacular, uncompromising and very exciting. It is popular and rugby bets when watching matches can be a great way to expand your horizons.

Nuances of betting on Rugby:

1) Carefully read the rules for accepting bets – whether extra time is included in the calculation of match results for P1, P2, X and odds bets. Often, due to an oversight or unwillingness to clarify such nuances with the bookmaker, disputes arise, where the winner, usually, is the BC.

2) if a match is canceled or postponed for more than three days, all bets on the match will be refunded without profit or loss.

3) If the initial pre-match bets were made under one of the conditions that affect the outcome of the game, and other conditions of the competition became known before the sports event, the bookmaker must return the bets to the betterer to re-evaluate their positions.

4) the Bet on the exact score takes into account the overtime that can be assigned after the end of the main halves.

I carefully read thanks, quite interesting and informative information. Yes, it’s really not so easy to bet on sports. There is a whole science that you need to know and apply. Various factors influence the forecast of a game, and experience comes over the years.

Sports betting is fun. You have to pay for it like a roller coaster or a trip to a bar for a beer. You will win and lose. And lower you almost certainly more than you earn. Think of losing as an entertainment pay.