Bets on "Matchbet+Over/Under" predicts the combination of two outcomes. To win the bet you have to predict both correctly.
For example, if the bet has been put on 1 and over 2.5, the first team has to win and the result (points, goals, sets etc.) has to be over 2.5. Therefore, if the game outcome is 3:0, 2:1 or 3:1, the bet is won. If the game ends in 2:0, the bet has been lost.