Choose the top piece of the small triangle in the very center of the board (P1). Staufs move (S1) will be one of the other two spaces in that tiny triangle. If he picks the right, as shown in this image: https://imgur.com/a/CqultoG complete the following line downwards into the bottom left corner with the moves P2-P4, finally extend upwards with P5.

If he picks the left, do the same thing just mirrored.

This will always work because the AI is weird. This will always win, because if the AI tries to block a connection between two of your pieces, chose the alternative connection between those pieces, same for P5 and the bottom wall.