Official NHA Assessment
Race 1: ROADHAVEN CONSTRUCTION MAIDEN PLATE (Maiden Plate Colts & Geldings to carry)
Line Horse
Hartenbos
Reference for assessment
Exact Matches
0 / 5
Calculated = Official
Close Matches
2 / 5
Within 2 points
Significant Diffs
2 / 5
More than 5 points
Detailed Assessment
------------------------------------------------------------------------------------------------------------------------ Pos Horse Age Weight Fin Lengths WFA Pre Race Rating New Adj ------------------------------------------------------------------------------------------------------------------------ 1 Tom's Diner 4 60.0 1 0.00 10.0 71 42 42 -29 2 Forever Royal 4 57.5 2 5.00 10.0 41 37 37 -4 3 Hartenbos 2 57.5 3 6.50 5.5 46 46 46 +0 4 Hemlock 2 59.0 4 10.00 5.5 - 49 49 +49 5 Dark Future 2 57.5 5 10.75 5.5 51 46 46 -5 ------------------------------------------------------------------------------------------------------------------------
Horse-by-Horse Comparison
| Pos | Horse | Pre-Rating | Official New | Calculated | Discrepancy | WFA (kg) | Line Horse | Calculation |
|---|---|---|---|---|---|---|---|---|
| 1 | Tom's Diner | 71 | 94 | 42 | +52 | 10.0 | - | |
| 2 | Forever Royal | 41 | 36 | 37 | -1 | 10.0 | - | |
| 3 | Hartenbos Line | 46 | 47 | 46 | +1 | 5.5 | ||
| 4 | Hemlock | - | 59 | 49 | +10 | 5.5 | - | |
| 5 | Dark Future | 51 | 49 | 46 | +3 | 5.5 | - |
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