This is an Android program to be used with the Blood Bowl table-top game by Games Workshop. To use the app just enter the position of the target square relative to the thrower. Then you will be shown locations from which it could be intercepted. No fuss, no muss, no arguing. The program uses 29 mm squares and 50 mm wide passing ruler.
The free version can be found here. The ad-free version can be found here.