Official NHA Assessment
Race 6: MERIT RATED 75 HANDICAP (Open)
Line Horse
Midfield Girl
Reference for assessment
Exact Matches
0 / 6
Calculated = Official
Close Matches
0 / 6
Within 2 points
Significant Diffs
4 / 6
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------ Pos Horse Age Weight Fin Lengths WFA Pre Race Rating New Adj ------------------------------------------------------------------------------------------------------------------------ 1 Obscure 4 60.0 1 0.00 1.0 72 83 72 +0 2 Midfield Girl 3 52.0 2 6.00 3.5 62 62 62 +0 3 At The Office 6 56.5 3 7.25 0.0 65 78 78 +13 4 Viscountess Vivien 6 56.0 4 9.75 0.0 64 77 77 +13 5 Apache Gold 3 52.0 5 11.75 3.5 53 62 62 +9 99 Magnus Maximus 4 59.5 99 0.00 1.0 - 82 82 +0 ------------------------------------------------------------------------------------------------------------------------
Horse-by-Horse Comparison
| Pos | Horse | Pre-Rating | Official New | Calculated | Discrepancy | WFA (kg) | Line Horse | Calculation |
|---|---|---|---|---|---|---|---|---|
| 1 | Obscure | 72 | 87 | 72 | +15 | 1.0 | - | |
| 2 | Midfield Girl Line | 62 | 59 | 62 | -3 | 3.5 | ||
| 3 | At The Office | 65 | 45 | 78 | -33 | 0.0 | - | |
| 4 | Viscountess Vivien | 64 | 72 | 77 | -5 | 0.0 | - | |
| 5 | Apache Gold | 53 | 52 | 62 | -10 | 3.5 | - | |
| 99 | Magnus Maximus | - | 71 | 82 | -11 | 1.0 | - |
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