The Banker Bet is a special option available in system betting. When you place a system bet, a "B" appears next to each selection, indicating the choice to activate the Banker function.
*The data used in the screenshot are indicative.
If you're very confident that one of your predictions will likely win, you can mark it as the "Banker" by clicking the "B" next to it. This will make the system treat that prediction as a sure win, combining it with your other bets.
Here's how it works: if the Banker bet wins, the overall odds for your ticket will increase, which could lead to bigger winnings. But if the Banker loses, the entire ticket will also lose, even if your other picks are correct.