Forecasts consist of picking two selections in the same event. A straight forecast involved picking, for instance, two horses in a race to place first and second, in that order. A reverse forecast offers a little more wiggle room in that the two horses can finish in either order (AB or BA) and you still win. Lastly, and less popular, a combination forecast involves picking three selections, two of which have to place first and second in any order.
If you see a race as being out of two horses, a forecast can be the ideal type of bet, especially if one of them or both are big odds selections.