Why arbs disappear — odds changes, palps and how to protect yourself
You found a 9% arb, placed the first leg… and the second leg's odds are gone. Sound familiar? Here's why it happens and what to do.
1. Odds move constantly
Big arbs usually exist because one bookmaker is slow to update. They correct it — often within minutes. That's why speed and the "bet first" leg matter.
2. "Palps" (palpable errors)
If a price is obviously wrong (e.g. 8.00 when everyone else has 1.80), the bookmaker may void the bet under their "obvious error" rules. Treat huge, isolated prices with suspicion — a 30% "arb" is usually an error, not a gift.
3. Different market rules
Two markets that look identical may settle differently — regular time vs including overtime, how corners are counted, retirement rules in tennis. Always check you're matching like with like.
If you're stuck with one leg placed
Prevention
1. Odds move constantly
Big arbs usually exist because one bookmaker is slow to update. They correct it — often within minutes. That's why speed and the "bet first" leg matter.
2. "Palps" (palpable errors)
If a price is obviously wrong (e.g. 8.00 when everyone else has 1.80), the bookmaker may void the bet under their "obvious error" rules. Treat huge, isolated prices with suspicion — a 30% "arb" is usually an error, not a gift.
3. Different market rules
Two markets that look identical may settle differently — regular time vs including overtime, how corners are counted, retirement rules in tennis. Always check you're matching like with like.
If you're stuck with one leg placed
- Don't panic-bet. Look for the same outcome at another bookmaker at a slightly lower price — a small loss is better than an unhedged bet.
- Sometimes the odds come back within minutes. Watch them.
- If the risk is acceptable you can let it ride, but know that you've now got a normal bet, not an arb.
Prevention
- Keep accounts funded and logged in.
- Place the volatile leg first.
- Skip arbs that look "too good" unless you've checked them carefully.
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