Official NHA Assessment
Race 3: MERIT RATED 72 HANDICAP (Open)
Line Horse
Karvani
Reference for assessment
Exact Matches
0 / 6
Calculated = Official
Close Matches
2 / 6
Within 2 points
Significant Diffs
3 / 6
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------ Pos Horse Age Weight Fin Lengths WFA Pre Race Rating New Adj ------------------------------------------------------------------------------------------------------------------------ 1 Viscountess Vivien 6 55.5 1 0.00 0.0 63 60 63 +0 2 Karvani 7 59.5 2 3.00 0.0 71 71 71 +0 3 Magic Vision 5 58.0 3 9.00 0.0 68 65 65 -3 4 At The Office 6 55.5 4 12.50 0.0 61 60 60 -1 5 Pacific Duke 4 60.0 5 14.00 1.0 72 67 67 -5 99 Wild Heritage 5 59.5 99 0.00 0.0 - 68 68 +0 ------------------------------------------------------------------------------------------------------------------------
Horse-by-Horse Comparison
| Pos | Horse | Pre-Rating | Official New | Calculated | Discrepancy | WFA (kg) | Line Horse | Calculation |
|---|---|---|---|---|---|---|---|---|
| 1 | Viscountess Vivien | 63 | 72 | 63 | +9 | 0.0 | - | |
| 2 | Karvani Line | 71 | 73 | 71 | +2 | 0.0 | ||
| 3 | Magic Vision | 68 | 64 | 65 | -1 | 0.0 | - | |
| 4 | At The Office | 61 | 45 | 60 | -15 | 0.0 | - | |
| 5 | Pacific Duke | 72 | 49 | 67 | -18 | 1.0 | - | |
| 99 | Wild Heritage | - | 71 | 68 | +3 | 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