Another take on it came from my time playing StarCraft 2. When the game was in full swing you could probably break it into 10 levels where anyone from the previous level can never beat someone in the next bracket.

When two of my friends started playing I could pretty easily beat both of them while they were playing together with any race setup, BUT at the same time it would have taken 3-5 of myself to even have the slightest chance against a professional level player.