What is force open?
Force open is a function on the trading platform that allows you to enter a new bet in the opposite direction to an existing bet on the same market. This will ensure you have two distinct positions open, except in the case where you have a short position on an unborrowable share.
A forced open should not be confused to a forced close, which occurs when a position is closed automatically without any action by you.
Force open vs net off
If you opt not to use force open, your open positions may be ‘netted off’. This is when existing positions are automatically closed if they would be cancelled out by the new position (unless you attach a stop or a limit, in which case it will keep both positions open).