The exact total goals line is used in a couple of different sports, including football (soccer in North America) and hockey.
With the exact total goals line, you are betting on exactly how many goals will be scored in a game.
There will be a number of different options available. For instance, I have picked a random line from a Manchester United v Chelsea game, and the "exact total goals" line looks like this:
Exact Total Goals
0 Goals, 12.00
1 Goal, 5.50
2 Goals, 3.75
3 Goals, 4.33
4 Goals, 5.50
5 Goals, 9.50
6 Goals, 17.00
7+ Goals, 21.00
So, if you think that the game is going to be a high-scoring affair, you'd might want to put some money on the 5, 6 or 7+ goal lines.
If you think that it will be a low-scoring affair, the 0, 1 or 2 goal lines might be tempting.
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With the exact total goals lines, you don't really care who wins the game - all you care about is that the game ends up producing the total number of goals that you predicted.