Open Bench refers to your team's reserves bench being free from positional restriction.
In addition to the 13 on-field players, your squad has eight (8) players that make up the Reserves Bench. Reserves Bench players are NOT locked to a specific position.
Four (4) Interchange (INT): The points of these players are added to your team's total. The four interchange players and the 13 players on the field are often referred to as the Starting (or Scoring) 17.
Four (4) Emergencies (EMG): The points of these players do not count to your team's score unless the player is used as an auto-emergency substitution for a Starting 17 player that does not play.
The bench players are ranked 1 to 8 and this determines a player's priority order for auto-emergency substitution. You can adjust the order of your Reserves Bench by clicking a player's substitution (the (S) button) on the website or the up-arrow & down-arrow buttons in the App. This 'substitution' process is subject to the same lock-out rules as all other player actions, meaning locked bench players can’t be moved.