Updated
A steamer is a horse whose betting price is shortening rapidly — meaning the market is taking lots of money on it and bookmakers are cutting the odds in response. The opposite is a drifter (price lengthening). Punters watch steamers because price moves often reflect informed money — stable confidence, insider knowledge, or a piece of overnight form that other backers have spotted.
Most steams come from one of three sources: (a) stable confidence — owners, trainers, or connections backing their own runner; (b) a tipster recommending the horse to a large audience, prompting a wave of small backers; or (c) sharp / professional money — punters who've identified a pricing error. Sharp money tends to come in early and incrementally; tipster steam is sudden and visible right at the off.
On average, yes — but only slightly. Studies of price moves consistently show that horses whose prices shorten between the morning and the off win above expectation. But the effect is small (a few percentage points), and it doesn't help individual punters unless you can get on before the price has fully moved. By the SP, the edge is usually priced out.
The market movers panel on /today surfaces every UK & Irish runner whose price has moved by 5% or more in the last 12 hours, split into two columns: steamers (shortening) and drifters (lengthening). Each entry shows the open → current price and the magnitude of the move.
A steamer is any horse whose price shortens — the move might be a small one (10-20%). A 'gamble' typically refers to a more aggressive move, often on a fancied horse from a smaller stable, where the price collapses sharply (e.g. 8/1 in the morning down to 7/2 by the off). All gambles are steamers, but not all steamers are gambles.
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