Occasionally, bookmakers may reduce the 3 outcomes for a football match to 2, by what is known as Double Chance, where a single price is offered on a win or draw. If the backed team wins or draws, the bet wins; if the team loses, so does the bet.
With double chance bets there is no possibility of the draw. The win/draw odds will always be shorter than for both the individual win and draw odds, because the chances of either outcome occurring are greater than for each one separately.