Official NHA Assessment
Race 5: SA DERBY 4 APRIL FM 93 DIVIDED HANDICAP (F & M) (For Fillies and Mares)
Line Horse
Bosum Buddy
Reference for assessment
Exact Matches
1 / 6
Calculated = Official
Close Matches
3 / 6
Within 2 points
Significant Diffs
1 / 6
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------ Pos Horse Age Weight Fin Lengths WFA Pre Race Rating New Adj ------------------------------------------------------------------------------------------------------------------------ 1 Poblano 3 60.5 1 0.00 5.0 94 94 94 +0 2 Caroline Island 2 54.0 2 1.80 3.5 88 84 84 -4 3 Bosum Buddy 3 56.5 3 2.80 5.0 86 86 86 +0 4 Miss Lia 3 61.0 4 3.40 5.0 95 95 95 +0 5 Roaming Spirit 3 58.0 5 4.40 5.0 89 89 89 +0 99 Let's Go Lola 2 55.5 99 0.00 3.5 - 87 87 +0 ------------------------------------------------------------------------------------------------------------------------
Horse-by-Horse Comparison
| Pos | Horse | Pre-Rating | Official New | Calculated | Discrepancy | WFA (kg) | Line Horse | Calculation |
|---|---|---|---|---|---|---|---|---|
| 1 | Poblano | 94 | 100 | 94 | +6 | 5.0 | - | |
| 2 | Caroline Island | 88 | 88 | 84 | +4 | 3.5 | - | |
| 3 | Bosum Buddy Line | 86 | 85 | 86 | -1 | 5.0 | ||
| 4 | Miss Lia | 95 | 95 | 95 | ✓ Match | 5.0 | - | |
| 5 | Roaming Spirit | 89 | 87 | 89 | -2 | 5.0 | - | |
| 99 | Let's Go Lola | - | 91 | 87 | +4 | 3.5 | - |
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