In baseball, the "run line and total" line involving combined the run line for a game with the total.
So, for instance, there would be four different "run line and total" line for a game between the Texas Rangers and Baltimore Orioles. These lines might look like this:Texas Rangers +1.5 and Over 8.5, 2.65
Texas Rangers +1.5 and Under 8.5, 2.80
Baltimore Orioles -1.5 and Over 8.5, 5.00
Baltimore Orioles -1.5 and Under 8.5, 4.75
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So, if you believe that the Orioles are going to easily win a high-scoring game, you would want to take the third line - Baltimore Orioles -1.5 and Over 8.5 Runs.
If you think that the Rangers are going to win a close, low-scoring game, you'd want to take them +1.5 and Under 8.5 for 2.80.
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The run line and total is simply a combination of the traditional baseball run line and over/under line and allows you to increase your potential payout.