A system bet is a way for a customer to select various different fixtures and place multiple bets on several possible outcomes.
If you lose a bet within a combo slip for example, the entire slip is lost. However, with a system bet, since you're placing multiple bets on multiple outcomes, you still have a chance to win.
Here's an example of a 2/3 bet:
If you place a 1 coin bet on this system type, you are placing 3 x 1 coin bets on the 3 possible 2-way combinations. In this example, if Zero Tenacity lose their game, the 1-2 and 1-3 combo selections (under 'System Details') will be settled as a loss, but you'll still have the chance to win the 2-3 selection if Endpoint and TSM are victorious.
List of bet types:
Singles - One single selection per bet
Doubles - Combos made up of two selections per bet
Trebles - Combos made up of three selections per bet
Four-folds - Combos made up of four selections per bet
Five fold - Combo made up of five selections in the bet
FS/5 - Full system of 5 bet selections including singles. This is 5 singles, 10 doubles, 10 trebles, 5 four-folds and a single five-fold bet. This will be displayed as 'Lucky 31' in your betslip and you will be placing 31 x 1 coin bets on the combinations mentioned.
F/5 - Full system of 5 selections. This is 10 doubles, 10 trebles, 5 four-folds and a single five-fold bet, but does not include any singles bets. This will be displayed as 'Canadian' in your betslip and you will be placing 26 x 1 coin bets on the combinations mentioned.
4/5 - All possible 4-way combinations are formed from the 5 selections.
3/5 - All possible 3-way combinations are formed from the 5 selections.
2/4 - All possible 2-way combinations are formed from the 4 selections.
2/3 - All possible 2-way combinations are formed from the 3 selections.
The list of system types can be found under 'Placing a Stake/making a Bet'.