A Related Contingency is when the same selection is taken to win more than one event where the outcome of one event may obviously or inadvertently influence the outcome of the other. The only bet types available at the current odds are singles and accumulative bets cannot be accepted.
Example: Tottenham are playing in the semi final of the FA Cup and are 6/4 to win their match. At the same time Boylesports have priced them at 3/1 to actually win the event.
In this scenario you cannot back both results as the first one affects the other. If Tottenham won the semi final they would no longer be 3/1 to win the event outright.