Official NHA Assessment

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Line Horse
One Irish Rover
Reference for assessment
Exact Matches
1 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
7 / 11
More than 5 points
Detailed Assessment
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Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
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1    Giambattista         3    56.5    1    0.00     4.0   61    49           61    +0
2    One Irish Rover      5    58.0    2    1.10     0.0   64    64           64    +0
3    Knight Warrior       5    59.0    3    2.60     0.0   66    64           64    -2
4    Brass Bell           8    55.5    4    5.20     0.0   59    55           55    -4
5    Bally Magic          6    54.0    5    7.00     0.0   56    52           52    -4
6    Mccartney            3    55.5    6    8.00     4.0   59    47           49    -10
7    Count Marsh          7    58.5    7    8.40     0.0   65    61           61    -4
8    Rafiki               2    57.5    8    9.80     0.0   63    59           59    -4
9    Mount Meru           4    60.5    9    12.80    2.5   69    60           60    -9
10   Levitator            5    55.5    10   19.70    0.0   59    55           55    -4
11   Crested Eagle        3    58.5    11   24.30    4.0   68    53           58    -10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Giambattista 61 87 61 +26 4.0 -
2 One Irish Rover Line 64 65 64 +1 0.0
3 Knight Warrior 66 74 64 +10 0.0 -
4 Brass Bell 59 55 55 ✓ Match 0.0 -
5 Bally Magic 56 60 52 +8 0.0 -
6 Mccartney 59 54 49 +5 4.0 -
7 Count Marsh 65 52 61 -9 0.0 -
8 Rafiki 63 67 59 +8 0.0 -
9 Mount Meru 69 50 60 -10 2.5 -
10 Levitator 59 60 55 +5 0.0 -
11 Crested Eagle 68 51 58 -7 4.0 -
Assessment Methodology
Calculation Steps:
  1. Identify Line Horse - consistent performer used as reference
  2. Calculate WFA Allowance based on age, distance, and month
  3. Apply Drag Adjustment for beaten margin
  4. Calculate Actual Weight Performance:
    Weight - Drag - WFA
  5. Compare to Line Horse to determine race rating
  6. 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