Bet types: how risk changes with each format
This page belongs to the guide's short betting section; the main subject remains casino games, explained on the games page.
Single
A single covers one outcome. It is the easiest bet to judge: the odds tell you what a winning bet returns and, through the implied probability, which chance it assumes.
Accumulator
An accumulator (also called a parlay or multiple) combines several outcomes into one bet. The odds multiply and the bet wins only if every selection is right. Three selections at 2.00 give combined odds of 8.00. What many people miss is that the bookmaker's margin compounds too: each extra selection moves the bet further from fair value. It behaves much like a high-volatility slot — bigger wins, much rarer.
System bets
A system bet is a set of accumulators built from the same selections — for example every possible double from three events. It costs more than one accumulator, because you are paying for several bets, but it can return something even when not every selection wins.
| Type | Wins when | Profile |
|---|---|---|
| Single | One outcome is right | Simplest to judge |
| Accumulator | Every outcome is right | High payout, low probability, compounded margin |
| System | At least one combination is right | Higher cost, risk spread out |
Handicaps and totals
A handicap gives one side a virtual head start or deficit to balance an uneven event. Totals, or over/under, concern the number of goals, points or games against a threshold. Both are useful for seeing how a bookmaker spreads probability, and both carry the same margin.
Cash-out
Some operators let you settle a bet before the event ends for an offered amount. That offer includes a further margin. Cash-out is not free: it is effectively a second bet against your first.
Each-way and specials
Each-way bets, common in racing and golf, split the stake between a win and a placed finish. Specials and novelty markets cover anything from the first scorer to the number of corners. They tend to carry higher margins than the main markets, because they are harder to price and attract casual bets.
One rule for everything
Whether it is accumulators or high-volatility slots, the pull towards the big win is the same. Set your budget first and do not raise it after a loss. More tools on the responsible gambling page; for odds and margin basics, return to sports betting.
Odds, markets and limits are set by the operator and change constantly. Sports betting law varies by country; check that the operator is licensed where you live.