Value is the most used and least defined word in betting. It has a precise meaning, and the meaning is a comparison: the probability inside the price against the probability you actually believe. Everything else is commentary.
The two probabilities
The first probability is easy. Divide one by the decimal price: 1.83 implies 54.6%. The second is the hard one, and it must come from you, before you look at the market. Form, injuries, head-to-head, scheduling, weather — whatever you use, it should produce a number, and the number should be written down.
If your number is higher than the implied probability, the bet has value at that price. If your number is 62% and the price says 54.6%, you expect to win 62 of every 100 such bets while being paid as if you would win 54.6. That gap is the whole edge, and there is no other.
Expected value in one line
EV per £1 staked = (your probability × decimal price) − 1. At 62% and 1.83 that is 0.62 × 1.83 − 1 = +0.13, or thirteen pence per pound over the long run.
Why the margin raises the bar
A market with a 4.7% margin prices every outcome as slightly more likely than it is. To have value you must beat not the fair price but the shaded one, which is why the margin guide matters before this one: a bet that is marginally right at Kestrel can be marginally wrong at Quaystone.
What value is not
- It is not a long price. A 9.00 shot with a 5% real chance is terrible value; a 1.20 shot with a 90% chance is good value.
- It is not a winning bet. Value bets lose, often; the claim is only that they lose less often than the price says.
- It is not visible in a week. A hundred bets is the earliest point at which your own estimates can be checked against reality, and the results guide explains how.
The practical test is simple and uncomfortable: record your probability for every bet, and after a hundred settle, compare the average of your numbers with your actual strike rate. If you said 60% and won 52%, the market was right and you were not — which is the most common outcome and the most useful thing to learn.
