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
Madureira 1 Fluminense 3 +17.4
+18.6
+1.0
Vasco da Gama 1 Volta Redonda 1 +7.2
+0.2
+0.1
Botafogo 2 Flamengo 2 +1.7
+1.8
+0.1
Bangu 2 Boavista 1 +1.5
+2.7
+0.1
Week of 4/9100.0*Chance wins title100.0*Semi-Final100.0*Average seed
Volta Redonda 0 Fluminense 2 +17.8
Yes
+0.5
Vasco da Gama 1 Madureira 0 -11.0
-0.1
Botafogo 1 Bangu 0 -2.0
-1.4
-0.2
Flamengo 3 Boavista 0 -0.8
-0.0
Week of 4/17100.0*Chance wins title100.0*Semi-Final100.0*Average seed
Fluminense 0 Vasco da Gama 1 No
-0.8
Boavista 0 Botafogo 1 -0.1
Points
Chance Will Win Championship