Blue non-corner strategy with isolating on a4 and b5

Remember, you want to isolate two white marbles on a4 and b5 if the first marble is placed in the blue area. Your strategy is to force your opponent to jump into the a4-d7 line. In the most cases you first have to force a jump into the d7-g4 line and remove g4 to force a jump onto d7.

You leave the board like this:

N = marble of free choice

nn = ring of free choice

First marble placed on a4 or b5:

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

First marble placed on c6 or d7:

Note that in this case you don't have ro remove g4, and you only give away five marbles.

First marble placed on f5 or g4:

First marble placed on d7 or e6:

First marble placed on a3 or b4:

First marble placed on b4 or c5:

First marble placed on d5 or e5:

First marble placed on f4: