However, not many have the -1 runline available and the ones that do will most likely charge a premium.
Betting on a team to win straight up is the moneyline. The runline is where the team you bet on must win by more than a single run. If they win by just one run, you lose the bet.
The -1 runline bet is different. It wins if your team wins by more than a single run but does not lose if they win by one run. Instead, it will push, refunding you your original stake.