The number of places bookmakers pay on a race depends mainly on two things: the number of runners and the type of race.
This is especially important if you are placing each way bets, because the place part of your bet only pays out if your horse finishes within the advertised places.
Standard each way terms usually follow long-established bookmaker rules, but these can vary in bigger races and during major meetings when firms offer enhanced place terms.
Understanding how many places are paid, and at what fraction of the odds, is one of the most important parts of betting each way properly.

