Why not make it possible to duel with no CP. When have of PvP is non CP and many make non-CP builds + dueling a CP 173 on my CP 810+ dont make sense and the pore new guy cannot see if he is doing good or bad because his CPs are just too low for Dueling.
Would make sense that you can ask people for a CP duel or a non-CP duel.
Would be better for many that are making setups or gear for BGs or non CP modes. And specialy new players can see how they are doing insted of just getting runned over by a 810+ player.