Step 1

You ask about an open side poach. Here's my strategy.

Step 2

Set up, and your dump's defender poaches the lane.

Step 3

My response would be a quick give go; you can get your defender to be trailing if you create seperation:

Step 4

The poaching defender runs over to put on a mark, but doesn't make it before the throw:

Step 5

Now you have the disc in a power postion with a deep cut and no mark. Let it rip!

Step 6