over 2.25 --> 2 goals: half win, 3 goals: win
under 2.25 --> 2 goals: half win, 1 goal: win
over 2.75 --> 3 goals: half win, 4 goals: win
under 2.75 --> 3 goals: half win, 2 goals: win
it is basically an extra insurance if you are not sure you actually want to bet on .5 bets
additional info: betting on straight numbers like for example "over 2" means you need 3 goals for a win, on 2 goals you get your bet refunded and on 1 goal you obviously lose