Why a very wide edge makes us look twice
A 20 point gap between our chance and the price is more often a sign we missed something than a gift. How we treat the widest cards, with Saturday's misses.
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A very wide edge is not a better bet. It is a question. When our chance sits 20 points above what the price implies, the likeliest explanation is that the market knows something our research weighed differently, or that the price is an outlier from one bookmaker. Sometimes the gap is real. We publish it either way, and we tell you why we doubt it.
What an edge is, and what it is not
The edge on a BAI8 card is our chance minus the chance the best price implies. Feyenoord at Real Betis is today's example: we make them 37.8%, the best quote was 6.25 at Unibet (NL), which implies about 16%, so the gap is 21.8 points. The arithmetic is in what a positive edge actually means.
The number is only as good as the two things it compares. If our 37.8% is too high, or the 6.25 is a price almost nobody else offers, the 21.8 shrinks or vanishes.
Why the widest gaps fail more often than they should
Betting markets pool a lot of information quickly: injury news, line-ups, money from people who watch one league closely. Being a few points away from that consensus is ordinary. Being 15 or 20 points away means we are saying the whole market is badly wrong. That does happen, but less often than a missed injury, a stale quote or a misread rotation.
Saturday 17 October made the point. Our four positive-edge calls won once.
| Call | Our chance | Price seen | Edge | Result |
|---|---|---|---|---|
| Everton v Chelsea, Everton | 41.3% | 3.35 | +11.5 pts | Lost |
| Venezia v Napoli, Napoli | 61.4% | 1.81 | +6.2 pts | Lost |
| Schalke v Mainz, Mainz | 47.7% | 2.34 | +4.9 pts | Won |
| Brentford v Liverpool, Brentford | 41.4% | 2.54 | +2.1 pts | Lost |
Four results prove nothing on their own, and Napoli only lost after Kevin De Bruyne missed a penalty, per Lega Serie A. But the widest of the four was the one we were furthest from being right about.
What we now check before writing one up
- Team news since the research ran. A card can be a day old. If a key player has been ruled out since, the market has moved and we have not.
- The age of the quote. A price from hours ago may already be gone. That is why every card carries a time; see why we timestamp every Desk quote.
- One bookmaker against the rest. A single long price at one book, with every other book much shorter, usually means the outlier is about to correct, not that the whole market is asleep.
- Who is missing on both sides. Today's Betis card is the case in point: Feyenoord's reported absences cover most of a back line.
None of this changes the number on the card. It changes how loudly we say it and how much of the article goes on what could make us wrong.
What this does not tell you
It does not mean wide edges always lose; over enough calls some will be right and pay well. It does not tell you how our wide calls have done over the whole record, because the sample is still small. It is a note on reading the card, not a rule for staking.
Common questions
Is a bigger betting edge always better?
No. A small edge can be real. A very large one usually means either the market knows something we missed, or the price is a stale or outlying quote. It needs checking before it means anything.
What is the widest edge on the BAI8 Desk today?
Feyenoord at Real Betis: we make them 37.8% and saw 6.25 at Unibet (NL), a 21.8 point gap. We publish it with the reasons we doubt it.
How did BAI8's widest calls do on Saturday 17 October?
Badly. Our four positive-edge calls won once. Everton at +11.5 points lost 0–2 to Chelsea and Napoli at +6.2 lost 1–0 at Venezia. Mainz at +4.9 won.
What should I check when an edge looks too big?
Team news since the research ran, how old the quote is, and whether one bookmaker is far away from all the others. If any of those explains the gap, the edge is probably smaller than it looks.