This is a perm which gives you two chances of getting the correct score right in each of two games.
Pick your games and display the bet like this: Team A v Team B x-x x-x; Team C v Team > D x-x x-x.
Then instruct: 2×2=four £1 doubles.
You can apply the same formula to first scorers. You could add one game and a third scorer to the first part and increase your selections to 27 trebles.