Most pre-race traders aim to be fully traded out before the off. Anything still open when the race starts is exposed to the result, and possibly to in-play price swings.
Trading out: what it means in exchange trading
Closing a position before the event so the result no longer depends on who wins.
18+. Trading on exchanges carries real risk and many people lose money. Set limits before you start. Support: BeGambleAware, GAMSTOP.