Official NHA Assessment
Race 1: BRIANNA BORROWDALE D STAKES 68 (For All Horses with a nett rating of 68 & below)
Line Horse
Prince Of Denmark
Reference for assessment
Exact Matches
0 / 5
Calculated = Official
Close Matches
1 / 5
Within 2 points
Significant Diffs
4 / 5
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------ Pos Horse Age Weight Fin Lengths WFA Pre Race Rating New Adj ------------------------------------------------------------------------------------------------------------------------ 1 Magic Exists 3 60.0 1 0.00 2.5 67 52 52 -15 2 Prince Of Denmark 4 60.0 2 0.50 1.0 60 60 60 +0 3 Jet Green 4 57.5 3 3.00 1.0 61 52 52 -9 4 Copper Fire 3 54.5 4 3.50 2.5 61 42 51 -10 99 When Evening Comes 5 57.5 99 0.00 0.0 - 52 52 +0 ------------------------------------------------------------------------------------------------------------------------
Horse-by-Horse Comparison
| Pos | Horse | Pre-Rating | Official New | Calculated | Discrepancy | WFA (kg) | Line Horse | Calculation |
|---|---|---|---|---|---|---|---|---|
| 1 | Magic Exists | 67 | 91 | 52 | +39 | 2.5 | - | |
| 2 | Prince Of Denmark Line | 60 | 51 | 60 | -9 | 1.0 | ||
| 3 | Jet Green | 61 | 54 | 52 | +2 | 1.0 | - | |
| 4 | Copper Fire | 61 | 60 | 51 | +9 | 2.5 | - | |
| 99 | When Evening Comes | - | 58 | 52 | +6 | 0.0 | - |
Assessment Methodology
Calculation Steps:
- Identify Line Horse - consistent performer used as reference
- Calculate WFA Allowance based on age, distance, and month
- Apply Drag Adjustment for beaten margin
- Calculate Actual Weight Performance:
Weight - Drag - WFA - Compare to Line Horse to determine race rating
- Apply special rules (maiden caps, layoff allowance)
Key Formulas:
- Drag Effect: Varies by distance (see Benchmarks page)
- 1 length ≈ 1kg at 1 mile (1600m)
- WFA Scale: Based on Admiral Rous's 1855 table
- Rating Points: 1kg = 2 rating points