Official NHA Assessment

Race 1: MAIDEN PLATE (Maiden Plate Colts & Geldings to carry)

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Line Horse
Hartenbos
Reference for assessment
Exact Matches
0 / 5
Calculated = Official
Close Matches
1 / 5
Within 2 points
Significant Diffs
3 / 5
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    King's Crown         3    60.0    1    0.00     8.5   -     43           6     +6
2    Hartenbos            2    58.5    2    1.25     5.5   46    46           46    +0
3    Hemlock              2    60.0    3    9.25     5.5   -     49           49    +49
4    Forever Royal        4    58.5    4    9.35     10.0  49    37           39    -10
99   Magic Exists         3    60.0    99   0.00     8.5   -     43           43    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 King's Crown - 79 6 +73 8.5 -
2 Hartenbos Line 46 47 46 +1 5.5
3 Hemlock - 59 49 +10 5.5 -
4 Forever Royal 49 36 39 -3 10.0 -
99 Magic Exists - 91 43 +48 8.5 -
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