What positive EV betting is
Every price implies a probability. Odds of 2.50 imply a 40 per cent chance. If you have good reason to believe the real chance is 45 per cent, the price is paying you more than the outcome is worth, and the bet has positive expected value.
The word to sit with is expected. Expected value is an average across many repetitions, not a claim about the next bet. A positive EV bet at 40 per cent implied probability still loses more often than it wins. The edge is a small tilt applied to a large number of coin flips, and it is invisible over a small number of them.
This is why positive EV betting demands a longer view than most people arrive with. A run of losses tells you almost nothing about whether the approach is sound, which is uncomfortable and is also the truth.
How it differs from arbitrage
Arbitrage covers every outcome, so the result of the event does not matter; what matters is that both prices stay available. Positive EV backs one side and lives with the result.
That makes positive EV higher variance and, in practice, more durable. Arbitrage patterns are conspicuous to bookmakers because the same accounts keep appearing on the right side of mispriced markets in pairs. A positive EV bettor loses often enough to look more like an ordinary customer for longer.
The two are not alternatives so much as different tolerances. Arbitrage asks for speed and capital across books. Positive EV asks for patience and a stomach for losing runs.
Which markets produce the most edges
Not all sports mispriced equally. Across the markets PandaBet's software scans, tennis and NBA produce the most detected edges. Both are high frequency sports with a large number of individually priced markets, and both run through parts of the day when Australian books are pricing off overseas markets that move first.
That is a statement about where the software finds candidates, not a prediction that tennis and NBA bets win. It is useful mainly because it tells you where the attention goes, and where an inexperienced bettor is likely to be wasting theirs.
The software covers baseball, basketball, soccer, tennis, AFL, NRL, cricket and ice hockey. AFL and NRL are the markets Australian books know best and price most tightly, which is precisely why fewer errors surface there.
What it takes to run
Positive EV betting needs three things that have nothing to do with sport. A probability estimate you actually trust, a staking rule that survives losing runs, and records honest enough to tell variance from error.
The estimate is the hard part. Most bettors substitute a hunch and then attribute the result to bad luck. Devigging, which strips the bookmaker's margin out of a price to reveal what the market really thinks, is the usual starting point for a defensible estimate.
Staking is where accounts die. The Kelly criterion sizes a stake from your edge and your bankroll, and most people who use it seriously use a fraction of it, because full Kelly assumes your probability estimate is exactly right and yours is not.
The risks
Your probability estimate can simply be wrong, in which case a bet you believe is positive EV is negative EV and no amount of discipline saves it. This is the risk that is genuinely difficult to see from the inside.
Variance is larger than most people expect. Losing runs are a normal feature of the approach, not evidence that something has broken.
Accounts still get limited. A consistent winner attracts attention whatever route they took to winning.
Nothing here is a projection of results. Past performance does not guarantee future results, and no page on this site will tell you what you might make.