Glossary of bets offered by UK bookmakers
This glossary of bets offered by UK bookmakers is a non-exhaustive list of traditional and popular bets offered by bookmakers in the United Kingdom. The 'multiple-selection' bets in particular are most often associated with horse racing selections but since the advent of fixed-odds betting on football matches some punters use these traditional combination bets for football selections as well. Forecasts. Forecasts are bets on a single event that require the correct forecasting of the finishing order of (usually) the first two or three finishers in the event. Returns on correctly  predicted finishing orders are calculated by industry sources via computer software that uses the starting price of all participants in the event, and are usually declared to a £1 stake unit on (mainly) horse and greyhound races. Straight Forecast. A straight forecast or computer straight forecast is a wager requiring the naming of two selections "a" and "b" to finish 1st and 2nd in the correct order in a specified event. Requires a single unit stake. Usually declared on horse and greyhound races of three or more runners. Equivalent to the USA exacta or perfecta, or the Canadian "exactor . Reversed Forecast. A reversed forecast (RF) is a wager requiring the naming of two selections to finish 1st and 2nd in either order in a specified event. It is the same as two straight forecasts on selections a" and "b": "a" 1st, "b" 2nd and "b" 1st, "a" 2nd. Requires two unit stakes. Equivalent to a "boxed" exacta/perfecta in North America, where the quinella is a similar wager that requires only one unit stake. Combination Forecast. A combination forecast is a wager on three or more named selections in order to choose two of the selections to finish 1st  and 2nd in the correct order in a specified event. It is the same as the number of straight forecasts on selections given by the formula and therefore requires this number of unit stakes. E.g. 3 selections - 6 bets; 4 selections - 12 bets; 5 selections - 20 bets; etc. Equivalent to boxing an exacta/perfecta with more than two runners in North America. Tricast. A tricast is a wager requiring the choosing of three named selections "a", "b" and "c" to finish 1st, 2nd and 3rd in the correct order in a specified event. Requires a single unit stake. Accepted on  horse races where 8 or more horses are declared and at least 6 run, and on greyhound races of 5 or more runners that form part of the bookmakers' main service. In North America, this wager is known as the trifecta (USA) or (Canada). Combination Tricast. A combination tricast is a wager on three or more named selections in order to choose three selections to finish 1st, 2nd and 3rd in the correct order in a specified event. Requires multiple unit stakes given by where is the number of selections. E.g. 3 selections, 6 bets; 4 selections, 24 bets; 5  selections, 60 bets; etc. In North America, this is a "boxed" trifecta.