10 it is.
I will state all challengers, and the final win-loss. If anyone knows that a challenger listed is actually an alt of a member, feel free to comment.
Challenger 1: gobhoblin:
http://warlight.net/Profile?p=553494272
Challenger 2: {wwd}gg:
http://warlight.net/Profile?p=3517891658
Challenger 3: Master of Strategy ♦ ReLite ♦:
http://warlight.net/Profile?p=7619399012