using Adobe Photoshop CS2 from http://en.wikipedia.org/wiki/Image:Rugby_union_scrummage.jpg to show gain line. Released under GNU Free Documentation License
license: according to: Image:Football iu 1996.jpg Image:Rugbyunionscrummage.jpg Image:Gateshead vs limoux.jpg is GFDL --Shizhao 08:11, 18 December 2006