Six mistakes keep coming back: confirmation bias, recency bias, the pull of long odds, attachment to a team you follow, ignoring the market, and chasing, which means betting more after a loss to win it back. That last one sits outside analysis: the scientific literature treats it as a behavioural marker of problem gambling.
The six mistakes at a glance
None of them comes from a lack of data. They come from how you select, weigh or ignore the data you already have.
| Mistake | Why it misleads | How to correct it |
|---|---|---|
| Confirmation bias | Only the data that confirms the hunch is kept | Explicitly look for what contradicts the starting hypothesis |
| Recency bias | The last match weighs more than the five before it | Fix the observation window before looking at the results |
| Favourite-longshot bias | High odds attract more than their probability justifies | Convert the odds into a probability before judging their appeal |
| Attachment to a team | Knowing a team well gets confused with overrating it | Check whether your analysis of a team you follow differs systematically from the market |
| Ignoring the market | An isolated opinion is never tested against anything | Compare the estimate with the consensus, even without following it |
| Chasing (winning it back) | An earlier loss weighs on an independent decision | Belongs to a responsible gambling framework, not to an analytical correction |
Confirmation bias: analysis that isn't
It's the most common bias and the hardest to spot in yourself, because it looks like analysis. The hunch comes first, the data comes second, and your search drifts towards whatever backs the hunch up.
Here's a quick test. If your analysis never overturns your starting conclusion, you're not analysing, you're justifying.
The fix is to state the opposite hypothesis and look for what would support it. If you find nothing, your original opinion comes out stronger, and this time for good reasons.
Recency bias: the last match takes over
The last match is the one you remember best, so it weighs the most in your judgement, however little it actually tells you. A heavy defeat on the latest matchday often outweighs five solid results before it.
Fix the observation window before you look at the results (the last six fixtures, say) and stick to it. A window picked after the fact is always picked for what it proves.
The pull of long odds
A big potential payout weighs more in your head than a low probability deserves. The effect has been documented on betting markets for a long time, and it pushes people towards longshots.
So convert the odds into a probability before deciding whether they tempt you. Odds of 12.00 correspond to roughly 8.3%. That figure is far less exciting than the payout on display.
The gap in how they feel is the real trap: 12.00 and 8.3% say the same thing, yet only one of them is tempting. The full method is on implied probability.
Attachment to a team you follow
Knowing a team inside out makes you feel you rate it better. Often it's the other way round. Following a side gives you plenty of qualitative information, but it also comes with an emotional charge that skews the weighting.
Compare your own estimates with the market on that team's matches. A gap that always points the same way is a clear signal. I put more weight on the direction of the gap than on its size, since a consistent lean points to a bias rather than a bad call.
Ignoring the market
Refusing to look at the odds protects you from no bias at all. You just lose a point of comparison. An opinion that's never tested can't be corrected.
The market doesn't have to be followed to be useful. It only has to act as a counterpoint, as in prediction or odds analysis.
Chasing: a mistake of a different kind
Betting more after a loss to make it up isn't an analysis error. It's a documented behavioural marker.
Since the DSM-III-R (American Psychiatric Association, 1987), chasing has been treated as a characteristic trait of problem gambling and a sign of the slide from recreational play to disordered play.
Nigro and co-authors (Journal of Gambling Studies) add a useful point. Gambling-related cognitive distortions predict how often someone chases, directly and also indirectly, because they shorten the person's time horizon. The more the view shrinks to the very short term, the more the catching-up behaviour sets in. The authors also note that the overall severity of gambling doesn't predict chasing on its own. The people concerned form a distinct profile.
If the urge to win a loss back keeps returning, talk to someone: GamCare answers on 0808 802 0133, free and 24/7.
Responsible gambling: the urge to win it back is a warning sign. Sports betting carries a risk of financial loss. Set yourself a budget, don't chase your losses, and use the deposit limits and self-exclusion tools available. Learn more about responsible gambling.
Correcting your biases: how far it goes
Correcting a bias makes your reasoning traceable. You see where opinion comes before data, and you can tell an analysis error from risky behaviour. You can also compare how sound two lines of reasoning are against each other.
What you can never conclude is that an analysis stripped of its biases becomes accurate. It gets better, and the result of a match stays open.
Evaluate a prediction without being trapped by its result →
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Put it into practice
Apply this guide to real odds.
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Odds movements are only part of the story. Here are the next topics to read.
How do you evaluate a prediction?
Judging a piece of reasoning rather than a single result.
See the evaluation methodPrediction or odds analysis?
Sporting intuition on one side, market reading on the other. They complement each other.
Understand the differenceIs a reliable prediction possible?
No prediction is guaranteed. Here's how to gauge how solid one is.
Understand reliabilitySports predictions: analyse before you bet
The complete guide: data, odds, reliability, bias and the role of AI.
Read the guideThe most common beginner mistakes
Chasing, impulsive stakes, endless accumulators: what costs the most.
Avoid these mistakesFrequently asked questions
What is confirmation bias in sports betting?
It's the habit of keeping the information that backs up a first hunch and dropping whatever contradicts it. One easy sign: your analysis never changes your starting conclusion.
Why is betting more after a loss a mistake?
Because the last loss tells you nothing about the next match. Raising your stake to make up for it turns an analytical decision into an emotional reaction.
How do you correct a bias you can't see yourself?
Write your analysis down before you know the result, then reread it afterwards. Reasoning noted in advance holds up badly against rebuilding it after the fact, so the bias shows.
Chasing losses: when does it become a problem rather than an analysis error?
When the behaviour repeats and slips out of your control. Since the DSM-III-R (1987), chasing has been treated as a characteristic behavioural marker of problem gambling, not a simple analytical slip.
Do biases disappear with experience?
No. Experience fixes some data errors, but it often feeds overconfidence, which is a bias in its own right.
Does OddScore provide tips?
Not in the tipster sense. OddScore compares the odds of several bookmakers, removes the margin and tracks how they move. The AI reading summarises what the market says, it isn't a bet to follow, and OddScore gives no staking advice.
Sources & methodology
This page draws on the scientific literature on gambling-related cognitive distortions and chasing behaviour, and on UK regulator and player-support resources. The references were checked in full text before publication.
- Describe each bias by its mechanism rather than by its name.
- Separate analysis errors from behavioural markers that fall under problem gambling.
- Attach a concrete, verifiable correction to each bias.
- Quote the numerical benchmarks with the exact wording published by their source.
- Nigro, G., Matarazzo, O., Ciccarelli, M., Pizzini, B., Sacco, M. & Cosenza, M. (2022). Positive Illusions: The Role of Cognitive Distortions Related to Gambling and Temporal Perspective in Chasing Behavior. Journal of Gambling Studies, 38(3).
- UK Gambling Commission, information for the public and players
- BeGambleAware, support and advice for gamblers