If a game/event has been postponed, there is typically a 24-hour waiting period for the match to be rescheduled. If the event does not take place within this timeframe, then the game/event is settled as void.
If the postponed selection is a single bet, the bet will be void, and the stake will be returned.
If the postponed selection is part of a winning multi bet, then the remaining winning selections will still be paid out.
