The vig & devigging
Bookmakers don't quote true probabilities — they bake in a margin called the vig. Removing it reveals the honest price your estimate actually has to beat.
What the vig is
Add up the implied probabilities of every outcome in a market and they sum to more than 100%. That overround is the vig — the bookmaker's built-in commission, charged whether you win or lose.
A market priced to 105% carries a 5% margin; the lower the overround, the sharper and fairer the book.
Devigging to find the true price
Removing the vig — devigging — rescales those inflated probabilities back to a fair 100%, revealing the market's honest estimate of each outcome.
That devigged probability, not the raw price, is the benchmark your own number must beat before a bet is genuinely +EV.
Why it changes how you bet
Compare your estimate to the raw price and the margin tricks you into seeing value that isn't there. Compare it to the devigged price and you see the real edge — or its absence.
Yoseri devigs every market for you, so the comparison that decides a bet is already done.
Theory is nice. Edges pay.
Yoseri does the pricing, edge and bankroll math for you — free to start, no card.