Official NHA Assessment

Race 3: SA DERBY 4 APRIL MAIDEN PLATE (For all Maidens)

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Line Horse
Willow Charm
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
1 / 9
Within 2 points
Significant Diffs
4 / 9
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    Major Arcana         4    60.0    1    0.00     4.0   68    71           70    +2
2    Wispinthewillow      3    53.5    2    0.10     3.5   66    59           59    -7
3    Brigitte Anne        2    57.5    3    1.90     2.5   72    69           69    -3
4    Tiger's Captain      2    60.0    4    3.65     2.5   66    74           74    +8
5    Willow Charm         2    60.0    5    3.95     2.5   74    74           74    +0
6    Come Together        3    57.5    6    4.75     3.5   70    67           67    -3
7    Epidaurus            3    60.0    7    5.50     3.5   66    72           72    +6
8    Velvet Valour        3    60.0    8    20.75    3.5   60    72           72    +12
99   Jawbreaker           3    60.0    99   0.00     3.5   -     72           72    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Major Arcana 68 74 70 +4 4.0 -
2 Wispinthewillow 66 71 59 +12 3.5 -
3 Brigitte Anne 72 70 69 +1 2.5 -
4 Tiger's Captain 66 70 74 -4 2.5 -
5 Willow Charm Line 74 70 74 -4 2.5
6 Come Together 70 70 67 +3 3.5 -
7 Epidaurus 66 63 72 -9 3.5 -
8 Velvet Valour 60 60 72 -12 3.5 -
99 Jawbreaker - 62 72 -10 3.5 -
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