How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 4/2100.0*Chance wins title100.0*Semi-Final100.0*Average seed
Vasco da Gama 1 Volta Redonda 1 +11.9
+0.1
Madureira 1 Fluminense 3 +9.2
+5.1
+0.4
Botafogo 2 Flamengo 2 +3.4
+0.3
+0.1
Bangu 2 Boavista 1 +0.3
+1.6
+0.1
Week of 4/9100.0*Chance wins title100.0*Semi-Final100.0*Average seed
Volta Redonda 0 Fluminense 2 +11.8
Yes
+0.4
Vasco da Gama 1 Madureira 0 -4.1
-0.1
Botafogo 1 Bangu 0 -0.7
-0.6
-0.1
Flamengo 3 Boavista 0 -0.7
Week of 4/17100.0*Chance wins title100.0*Semi-Final100.0*Average seed
Fluminense 0 Vasco da Gama 1 No
-0.9
Boavista 0 Botafogo 1 -0.0
Points
Chance Will Win Championship