Movement
Opening price vs closing price in betting
The opening price (or opener) is the very first price a bookmaker publishes for a runner or selection. The closing price is the last price before the market is suspended at the jump or the start of play. The difference between the two is one of the most-studied numbers in punting analytics.
Bookmakers don't price every market the same way. For early-week AFL or NRL games, the opener might be hand-set by a trader days out; for a metropolitan thoroughbred meeting, the opening price can be released only in the morning. Either way, the opener is a first-best-guess from the operator before market money has shaped it.
Between the opening and the closing price, money flows: large bets shorten a runner, missing money lets it drift, and other operators' prices nudge each book. The closing price is the bookmaker's final read on the market and — across thousands of events — tends to be a sharper estimate of true probability than the opener was.
That's why "beating the close" matters in punting analytics: a bet taken at $5.00 on a runner that closes at $4.00 has captured value the market later agreed with. The gap between open and close also tells you something about how confident the trading desk was in their initial price, and how heavy the action was on either side.
Worked example
A horse opens at $6.50 with most operators on Friday afternoon. By jump time on Saturday, the same horse is into $4.20 on the board. Across the board the runner has shortened nearly two points — meaning meaningful money came for it and the market has revised its assessment of the runner's chances upward.
A punter who took the $6.50 opener has captured a price the closing market later said was too long.
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