Here is a look at the xG stats for Alaves vs Barca on October 31, 2020. This was a game Barcelona should’ve won, but had to settle for a point.
xG Alaves 0.90-2.18 Barcelona (Actual score Alaves 1-1 Barcelona)
Alaves’ goal (coming from a Neto error) had a xG of 0.75 (out of their total xG of 0.90). Barcelona’s goal, scored through Griezmann, had a xG of 0.46
xG of some other notable Barcelona chances
13′ Ansu Fati xG 0.22
43′ Lionel Messi xG 0.18
54′ Ansu Fati xG 0.11
36′ Frenkie de Jong xG 0.10
74′ Ansu Fati xG 0.11
Full time stats for comparison
Plenty of shots and possession for Barcelona against ten man Alaves, but they couldn’t convert it into goals or points.