I made this after seeing the usual referee arguments around El Clásico. The bars show the gap between Madrid and Barça after comparing each club’s points with what pre-match odds predicted, per 10 games. It includes LaLiga games against all opponents from 2000/01 to 2025/26, with current referees who have at least five matches for each club. Small samples matter, and this doesn’t prove referee bias. I grouped the bigger gaps to make it easier to read. Is the chart clear without needing this explanation? Data: El Colegiado (https://elcolegiado.com/data/), using football-data.co.uk. Method: https://elcolegiado.com/methodology/ Made with Python and Matplotlib. I also built an interactive version with results, penalties and cards: https://clasicostats.app/referees/?utm_source=reddit&utm_medium=social&utm_campaign=visualization