Official NHA Assessment
Race 2: MAIDEN PLATE (Maiden Plate Colts & Geldings to carry)
Line Horse
Bruce's Spirit
Reference for assessment
Exact Matches
0 / 5
Calculated = Official
Close Matches
0 / 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 Lady Emma Hamilton 2 55.5 1 0.00 0.0 51 36 36 -15 2 Bruce's Spirit 6 60.0 2 0.50 0.0 50 50 50 +0 3 Elmhurst 2 58.0 3 4.00 0.0 60 42 50 -10 4 Montanna Bay 2 55.0 4 8.00 0.0 - 35 35 +35 5 Apache Gold 3 60.0 5 20.00 8.0 50 29 40 -10 ------------------------------------------------------------------------------------------------------------------------
Horse-by-Horse Comparison
| Pos | Horse | Pre-Rating | Official New | Calculated | Discrepancy | WFA (kg) | Line Horse | Calculation |
|---|---|---|---|---|---|---|---|---|
| 1 | Lady Emma Hamilton | 51 | 57 | 36 | +21 | 0.0 | - | |
| 2 | Bruce's Spirit Line | 50 | 55 | 50 | +5 | 0.0 | ||
| 3 | Elmhurst | 60 | 56 | 50 | +6 | 0.0 | - | |
| 4 | Montanna Bay | - | 51 | 35 | +16 | 0.0 | - | |
| 5 | Apache Gold | 50 | 52 | 40 | +12 | 8.0 | - |
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