FormLab’s own continuous course-class scale, rebuilt from the last 3 years of GB flat handicaps and refreshed daily after racing. The Course Z-Score is half the average official rating of the horses that run there, half the average prize money (log-scaled) — each expressed as a z-score so the two combine on one footing.
ELITE
HIGH
MID
LOWER
— display tiers by score quartile (the coloured rank rail).
Reading Fav A/E — the diverging bar pivots at 1.00. It fills green to the right when favourites over-perform (a formful, reliable track) and red to the left when they under-perform (a trappier course).