Official NHA Assessment
Race 4: MERIT RATED 75 HANDICAP (Open)
Line Horse
Cutback
Reference for assessment
Exact Matches
1 / 6
Calculated = Official
Close Matches
3 / 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 Differentiate 5 58.5 1 0.00 0.0 72 69 72 +0 2 Ideal View 6 57.0 2 0.10 0.0 70 66 66 -4 3 Cutback 6 58.5 3 0.85 0.0 73 73 73 +0 4 Viscountess Vivien 6 59.5 4 4.35 0.0 74 71 71 -3 5 Tradition 4 60.0 5 4.85 3.5 75 65 65 -10 6 Magic Mike 6 58.0 6 8.35 0.0 71 68 68 -3 ------------------------------------------------------------------------------------------------------------------------
Horse-by-Horse Comparison
| Pos | Horse | Pre-Rating | Official New | Calculated | Discrepancy | WFA (kg) | Line Horse | Calculation |
|---|---|---|---|---|---|---|---|---|
| 1 | Differentiate | 72 | 72 | 72 | ✓ Match | 0.0 | - | |
| 2 | Ideal View | 70 | 90 | 66 | +24 | 0.0 | - | |
| 3 | Cutback Line | 73 | 63 | 73 | -10 | 0.0 | ||
| 4 | Viscountess Vivien | 74 | 72 | 71 | +1 | 0.0 | - | |
| 5 | Tradition | 75 | 77 | 65 | +12 | 3.5 | - | |
| 6 | Magic Mike | 71 | 67 | 68 | -1 | 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