Official NHA Assessment

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Line Horse
Imperial Power
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
2 / 8
Within 2 points
Significant Diffs
3 / 8
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    Isivivane            3    60.0    1    0.00     5.0   95    92           92    -3
2    Sundance Kid         5    57.5    2    0.15     0.0   96    97           97    +1
3    Imperial Power       4    53.0    3    1.35     2.5   86    86           86    +0
4    Eventidor            6    55.5    4    5.15     0.0   85    93           93    +8
5    Perilla              5    56.0    5    6.85     0.0   91    94           94    +3
6    Star In Motion       2    52.5    6    7.65     0.0   80    87           87    +7
99   Gotta Go Eddie       2    51.0    99   0.00     0.0   -     84           84    +0
99   Syx Hotfix           3    55.5    99   0.00     5.0   -     83           83    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Isivivane 95 104 92 +12 5.0 -
2 Sundance Kid 96 96 97 -1 0.0 -
3 Imperial Power Line 86 89 86 +3 2.5
4 Eventidor 85 89 93 -4 0.0 -
5 Perilla 91 89 94 -5 0.0 -
6 Star In Motion 80 77 87 -10 0.0 -
99 Gotta Go Eddie - 93 84 +9 0.0 -
99 Syx Hotfix - 83 83 ✓ Match 5.0 -
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