Closing Line Value (CLV)

Closing line value compares the price obtained against the price available when betting closes. Backing a team at 2.20 that closes at 2.00 is positive CLV: the market moved toward the position after the bet was struck. Because the closing line reflects the maximum information and money the market absorbed, it is treated as the most efficient publicly available estimate of true probability, and beating it consistently is strong evidence of genuine predictive skill.

CLV is valued precisely because results are noisy. A bettor may be profitable over hundreds of bets through luck, or unprofitable despite a real edge, but consistent positive CLV is very difficult to produce by chance. Sportsbooks use the same signal in the other direction: customers who reliably beat the closing line are identified as sharp and are commonly restricted or limited, a practice that sits at the centre of long-running arguments about account restrictions in mature betting markets.