Constitution Hill’s appearance in today’s September Stakes at Kempton provides a fascinating real-world test of one of racing’s oldest rules of thumb: how do jumps ratings translate to the Flat?
The traditional shortcut is to deduct roughly 40–50lb from a hurdle rating to obtain a comparable Flat figure. But it is important to understand what that means. It is a guide to the different rating scales, not a guarantee of transferable ability. Racing TV describes the 50lb deduction as a general rule of thumb while acknowledging that “it rarely works out”.
That makes Constitution Hill particularly interesting.
At his peak he achieved a hurdle rating around 175–177, depending on the ratings source and point in his career. Deducting 50lb theoretically puts him somewhere around 125–127 on a Flat scale.
Yet what he has actually achieved on the Flat is very different.
After winning his first two Flat races, Timeform rates him 113P. The capital P is significant: it indicates that substantial improvement is considered likely. His official Flat rating is only 101.
Today we discover considerably more.
The September Stakes is genuine Group company. Gethin is rated 127 by Timeform, leaving Constitution Hill 14lb to find on demonstrated Flat form. Recent winners of this race include Kalpana (129), Giavellotto (128), Bay Bridge (128), Mostahdaf (126) and Hamish (122).
That gives us a useful benchmark.
If Constitution Hill produces something around 118–122, he will have improved significantly and demonstrated that he belongs in good Flat company.
If he reaches 125+, the experiment becomes much more interesting.
And if he can approach 127 and defeat Gethin on merit, the crude 50lb conversion will suddenly look remarkably prescient in his particular case.
But victory or defeat isn't the only evidence worth examining. Watch how Constitution Hill travels when established Group horses increase the tempo. Can he hold his position? Does he possess their acceleration, or is he outpaced before his stamina brings him back into contention?
That is ultimately the flaw in treating ratings as a simple mathematical conversion.
A 175 hurdler isn't automatically a 125 Flat horse.
The ratings tell us how exceptional a horse has been within its own discipline. Flat racing then asks a different question.
Today Constitution Hill gets the opportunity to answer it.
And that makes the 2.50 Kempton far more interesting than simply another Group 3. It is a genuine racing experiment.
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