In-Play Odds: Why Odds Change During a Match
In-play odds are betting multipliers that apply throughout a match. They constantly change and can differ significantly from pre-match ones. Pre-amatch odds in sports betting change slowly. Live odds do not stay the same for even a second and react not only to goals, but also to cards, substitutions, etc.
Why odds move the way they do
Behind every odd is a probability (What are betting odds? The article is worth looking at in more detail). It is calculated as follows:
Fair chances = 1 / probability.
Let's apply this to a real event:
Before the game, Flora is estimated at 55%. 1 ÷ 0.55 = 1.82 - fair likelihood. The bookmaker adds a margin and offers approximately 1.73.
30th minute, Flora scores. The probability of its win rises to approximately 78%: the team is leading, and the opponent has half as much time to respond. 1 ÷ 0.78 = 1.28, with the margin around 1.25.
The opponent equalizes. The score is level, and the probability returns to 55%, with the probabilities returning to approximately 1.73.
As you can see, the chances dropped not because of the goal itself, but because of the decrease in uncertainty.
What affects in-play odds
Goals have the biggest impact on live betting odds. But red cards, extra time, corners and free kicks, substitutions, etc. can also change the bookmaker's line. Likelihood will be adjusted in response to any events that provide more certainty about the outcome of the match.
In-play odds vs pre-match odds
The pre-match line is a prediction. The live line (what is live betting explains more) reacts to events that have already happened.
By the 30th minute, there will be information that was not available when the line opened. This does not guarantee a big win. The bookmaker sees the same thing and quickly changes the odds. The question is whether the price keeps up with the game; what is a value bet explores this thoroughly.
