On Tuesday, Buddy One went off at a bigger price than the 7/4 on our card. In racing terms he drifted, and it's worth understanding what that does and doesn't tell you.
Why prices move. Odds shorten when more money is placed on a horse than the market expected and lengthen when less is. A price is, in effect, the market's running estimate of a horse's chance. A price of 7/4 implies roughly a 36% chance, while 9/4 implies roughly 31%, so when a price drifts out, the market is saying the horse is a little less likely than it thought earlier.
What a drift can reflect. Sometimes it reflects information: a horse that doesn't look well in the paddock, ground that seems less suitable, a rival attracting support or a late rider change. Sometimes it reflects very little, such as quiet betting on an early price that was always a touch short. A drift on its own doesn't tell you which.
Why you shouldn't over-read it. Markets are often right, but they're also often wrong, and short-priced favourites in small fields get beaten regularly. A drifter can win, and a well-backed horse can lose. Treating a price move as a verdict is as unreliable as treating one result as a trend.
What it can usefully do. A move gives you a reason to re-check the card, particularly if it's large. For Buddy One, the reasons for caution were already on the page: a winless run, a rating that placed him second of five, a layoff, the weight and a cold yard. The market's move was consistent with that picture, though it wasn't proof of it.
How we use it. We publish a price with each NAP, but prices change between our card and the off, and we're upfront about that. We don't treat a move as a prediction either way, and we don't change our written assessment after the fact because the price has moved.
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