Drifter
A drifter is a selection whose odds are lengthening — the price is "drifting out". A team priced at 2.50 at open showing 3.00 an hour before kick-off has drifted, which mechanically means bookmakers are taking less money on that outcome than expected, or heavy money on the opposite side has forced the whole market to rebalance around it.
Drifts carry the same interpretive ambiguity as steamers, with one addition: absence of money is weaker evidence than presence of money. A price can drift because informed bettors know something negative — a key player missing from the warm-up, a rotated line-up — or simply because the fixture is unfashionable and the market is quiet. Late drifts close to kick-off are more likely to reflect team news than morning drifts, because that is when the information actually exists.
The counterintuitive angle: a drifter is the only kind of price move that can create value. If the true probability of an outcome has not changed but its price has lengthened, the bet is better than it was at open. Our model prices every fixture independently of the market's movement, so when a drifting price moves past the model's own number, that gap is measurable rather than a feeling.
The day's biggest moves in both directions, with the model's probability beside each, are on the steamers and drifters page.