Every sportsbook builds a margin (the vig, or hold) into its prices. On a -110 / -110 line the two sides imply 104.8% — the extra 4.8% is what the book keeps. The low-vig board finds, for every market on every game, the pair of books whose two sides add up closest to 100%, so you pay the least juice on any bet.
Pairs with the devig calculator to see the fair, no-vig price.
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