The Grievous Conflict of Geonosis was a battle between Grievous and Darth Grievous. It began after General Grievous asked Darth Darth Binks on advice on being cool. Binks scoffed this idea, telling his general to battle Darth Grievous just so he could watch him die. Amazingly, General won against Darth, earning the creation of Grievous' Planet.
The lame Grievous stepped into the Geonosian arena, where the Clone Wars began. Darth Grievous was waiting for him. The lame Grievous kicked his ass for some reason. That's good enough, right? I mean I wasn't going for an A+, Mr. Parcel.
Why Did the Lame-o Win? Edit
Nothing is known as of now, except that it has to do with the mysterious order of the Sarths. We don't even know what Sarths are yet, but could find out in the near future.