Official NHA Assessment
Race 4: MERIT RATED 77 HANDICAP (Open)
Line Horse
The Octagon
Reference for assessment
Exact Matches
2 / 6
Calculated = Official
Close Matches
3 / 6
Within 2 points
Significant Diffs
2 / 6
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------ Pos Horse Age Weight Fin Lengths WFA Pre Race Rating New Adj ------------------------------------------------------------------------------------------------------------------------ 1 September Flower 2 60.0 1 0.00 0.0 78 77 78 +0 2 The Octagon 2 59.5 2 5.00 0.0 76 76 76 +0 3 Aerial Display 5 57.5 3 5.25 0.0 72 72 72 +0 4 King's Crown 3 58.0 4 6.50 8.0 74 57 64 -10 5 Karvani 7 57.0 5 10.50 0.0 71 71 71 +0 6 Cosmic Event 5 56.5 6 99.99 0.0 70 70 70 +0 ------------------------------------------------------------------------------------------------------------------------
Horse-by-Horse Comparison
| Pos | Horse | Pre-Rating | Official New | Calculated | Discrepancy | WFA (kg) | Line Horse | Calculation |
|---|---|---|---|---|---|---|---|---|
| 1 | September Flower | 78 | 91 | 78 | +13 | 0.0 | - | |
| 2 | The Octagon Line | 76 | 76 | 76 | ✓ Match | 0.0 | ||
| 3 | Aerial Display | 72 | 68 | 72 | -4 | 0.0 | - | |
| 4 | King's Crown | 74 | 79 | 64 | +15 | 8.0 | - | |
| 5 | Karvani | 71 | 73 | 71 | +2 | 0.0 | - | |
| 6 | Cosmic Event | 70 | 70 | 70 | ✓ Match | 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