Official NHA Assessment
Race 4: JOHNNIE WALKER MR 68 HANDICAP (Open)
Line Horse
Aquila Gold
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
3 / 8
Within 2 points
Significant Diffs
4 / 8
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------ Pos Horse Age Weight Fin Lengths WFA Pre Race Rating New Adj ------------------------------------------------------------------------------------------------------------------------ 1 Eyjafjallajokull 2 61.5 1 0.00 0.5 71 75 71 +0 2 Ravilious 3 61.0 2 1.00 1.5 85 72 75 -10 3 William The First 2 61.5 3 1.10 0.5 71 75 75 +4 4 Aquila Gold 4 59.5 4 1.85 2.0 68 68 68 +0 5 Bytheliteofthemoon 4 59.5 5 2.35 2.0 68 68 68 +0 6 Duke Of Orange 3 50.0 6 2.60 1.5 56 50 50 -6 7 Back To Basics 3 60.5 7 3.85 1.5 72 71 71 -1 99 Absolu Noir 8 52.5 99 0.00 0.0 - 58 58 +0 ------------------------------------------------------------------------------------------------------------------------
Horse-by-Horse Comparison
| Pos | Horse | Pre-Rating | Official New | Calculated | Discrepancy | WFA (kg) | Line Horse | Calculation |
|---|---|---|---|---|---|---|---|---|
| 1 | Eyjafjallajokull | 71 | 86 | 71 | +15 | 0.5 | - | |
| 2 | Ravilious | 85 | 81 | 75 | +6 | 1.5 | - | |
| 3 | William The First | 71 | 75 | 75 | ✓ Match | 0.5 | - | |
| 4 | Aquila Gold Line | 68 | 56 | 68 | -12 | 2.0 | ||
| 5 | Bytheliteofthemoon | 68 | 70 | 68 | +2 | 2.0 | - | |
| 6 | Duke Of Orange | 56 | 53 | 50 | +3 | 1.5 | - | |
| 7 | Back To Basics | 72 | 72 | 71 | +1 | 1.5 | - | |
| 99 | Absolu Noir | - | 50 | 58 | -8 | 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