http://wiki.guildwars2.com/wiki/PvP_Matchmaking_Algorithm
According to this we may have either 10 or 16 mmrs. How large is the mmr reduction for starting on a new profession? Second line under the configuration header:
Rating default=“1500” min=“100” max=“5000” max-change=“300” profession-ratio=“0.25”
What does 0.25 mean? Does this value vary within a certain range? Is the rating gained by playing mesmer uncoupled from the rating on necro? Or does it affect the ‘core’ rating as well as a specific profession multiplier?