I see, in "Settings", below the Map:

Message from host:
This game was created by the Quickmatch system using the template [name] ([number]).
Contender: pacifist (match rating [number])
Contender: John Doe (match rating [number])

What's the meaning of the two ratings?
Thanks for answering

Match rating is used for matchmaking in QM. The assumption is that your match rating reflects your skill level on the given template, and so the game will try to find you an opponent with match rating as similar to yours as possible.

If I recall correctly, the main component of your match rating is your rating on the template you're playing. The second component is your global QM rating (it has around 20% weight).

thanks Rento,
it's as you say, I checked that the proportions are exactly: template rating 90%, global rating 10%.
Have many GG!