This is correct. In case you did not know yet, the sum of win and lose points is always 20. Like your example, you see +9 on a win, it means you will lose 11 points if you did not.
11 + 9 is 20.
If you see +5, it means you will get -15 if you lose.
This is also why I said on my earlier post not to attack below +7 because it is risky.
If you attack +6, and you lose 1 battle, you will get +6 +6 - 14. So you get -2 points even if you win 2 of the battles.
torr02 said:
they promise you 9+9+9
You get -11 +9 -11