Are you a big baseball fan?
What do you mean Brighton/Peterborough/Everton -1?
Basically it's a handicap bet, Everton start the game with -1, Now normal odds for Everton to win are 8/15 and Everton -1 are 11/8.
Meaning that Everton must win by 2 goals for your bet to come in. eg 2-0, 3-1, 3-0 ect.
It gives you a chance to get better odds without choosing the score.
PS. What's peoples Baseball bets for tonight, I got a spare £10 I wouldn't mind sticking on.