Both sides of a market, with the cut removed, to the vig-free fair price and hold.

A single price has the book's cut built in, so it always looks a little worse than fair. To find the fair price, you take both sides of the market and shrink them in proportion until the two chances add up to exactly 100%. What is left is the vig-free fair chance, and the price that chance deserves.

This is the heart of how BetChecker works. The fair price is the yardstick: a price you can get is good only when it pays more than the fair price, and bad when it pays less. Enter a price you can get on the side below and this tool grades it against fair, the same A-to-F way BetChecker grades a slip.

BetChecker grades with the stricter of two standard de-vig methods, so it never flatters a price. Across 164,283 real bets, the ones that beat the fair closing price were the only group that made money. Beating fair is the whole game.