Official NHA Assessment
Race 4: BETWAY MR 66 HANDICAP (Open)
Line Horse
Guy Alexander
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
2 / 8
Within 2 points
Significant Diffs
6 / 8
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------ Pos Horse Age Weight Fin Lengths WFA Pre Race Rating New Adj ------------------------------------------------------------------------------------------------------------------------ 1 Flag Bearer 3 52.5 1 0.00 9.5 59 49 59 +0 2 Guy Alexander 3 56.0 2 2.50 9.5 58 58 58 +0 3 Callaburn 2 59.5 3 3.60 0.0 67 83 83 +16 4 Full Go 6 57.0 4 3.90 0.0 60 78 78 +18 5 Manz Knight 6 60.0 5 5.25 0.0 66 83 83 +17 6 Cantfoolme 2 55.5 6 5.50 0.0 57 74 74 +17 7 Azucar 3 54.5 7 6.50 9.5 55 53 53 -2 8 Whistledown 4 59.0 8 99.99 6.0 66 69 69 +3 ------------------------------------------------------------------------------------------------------------------------
Horse-by-Horse Comparison
| Pos | Horse | Pre-Rating | Official New | Calculated | Discrepancy | WFA (kg) | Line Horse | Calculation |
|---|---|---|---|---|---|---|---|---|
| 1 | Flag Bearer | 59 | 60 | 59 | +1 | 9.5 | - | |
| 2 | Guy Alexander Line | 58 | 72 | 58 | +14 | 9.5 | ||
| 3 | Callaburn | 67 | 52 | 83 | -31 | 0.0 | - | |
| 4 | Full Go | 60 | 59 | 78 | -19 | 0.0 | - | |
| 5 | Manz Knight | 66 | 60 | 83 | -23 | 0.0 | - | |
| 6 | Cantfoolme | 57 | 51 | 74 | -23 | 0.0 | - | |
| 7 | Azucar | 55 | 53 | 53 | ✓ Match | 9.5 | - | |
| 8 | Whistledown | 66 | 63 | 69 | -6 | 6.0 | - |
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