Official NHA Assessment
Race 3: ROXBURY MERIT RATED 80 HANDICAP (Open)
Line Horse
Aerial Display
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 My Secret Place 5 57.0 1 0.00 0.0 74 70 74 +0 2 Aerial Display 5 59.0 2 0.75 0.0 78 78 78 +0 3 Power Ranger 7 62.5 3 1.75 0.0 85 84 84 -1 4 Ultimate Jewel 5 60.0 4 4.75 0.0 80 76 76 -4 99 Ian's Ferrari 3 59.5 99 0.00 1.0 - 73 73 +0 99 Captive Moon 6 55.0 99 0.00 0.0 - 66 66 +0 ------------------------------------------------------------------------------------------------------------------------
Horse-by-Horse Comparison
| Pos | Horse | Pre-Rating | Official New | Calculated | Discrepancy | WFA (kg) | Line Horse | Calculation |
|---|---|---|---|---|---|---|---|---|
| 1 | My Secret Place | 74 | 71 | 74 | -3 | 0.0 | - | |
| 2 | Aerial Display Line | 78 | 68 | 78 | -10 | 0.0 | ||
| 3 | Power Ranger | 85 | 69 | 84 | -15 | 0.0 | - | |
| 4 | Ultimate Jewel | 80 | 80 | 76 | +4 | 0.0 | - | |
| 99 | Ian's Ferrari | - | 63 | 73 | -10 | 1.0 | - | |
| 99 | Captive Moon | - | 75 | 66 | +9 | 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