Red non-corner strategy with isolating on a1 and b1

Remember, you want to isolate two white marbles on a1 and b1 if the first marble is placed in the red area. Your strategy is to force your opponent to jump into the a1-d1 line. In the most cases you first have to force a jump into the d1-g1 line and remove g1 to force a jump onto d1.

You leave the board like this:

N = marble of free choice

nn = ring of free choice

First marble placed on a1 or b1:

Note that in this case you can choose one ring to remove.

First marble placed on c1 or d1:

Note that in this case you don't have ro remove g1, and you only give away five marbles.

First marble placed on f1 or g1:

First marble placed on d2 or e1:

First marble placed on b2 or c2:

Note that b2 is in the green area, but can be handled as if it were in the red area.

First marble placed on e2 or f1: