Official NHA Assessment

Race 3: SA DERBY 4 APRIL MAIDEN PLATE (F & M) (For Maiden Fillies and Mares)

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Line Horse
Gathering Winter
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
6 / 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    Ada Lovelace         2    60.0    1    0.00     2.5   60    68           66    +6
2    Gathering Winter     2    60.0    2    2.10     2.5   68    68           68    +0
3    Greenandgold         3    60.0    3    3.50     3.5   -     66           66    +66
4    Charleston Dawn      2    60.0    4    4.60     2.5   60    68           68    +8
5    Wispinthewillow      3    60.0    5    4.85     3.5   73    66           66    -7
6    Banana Split         3    60.0    6    7.65     3.5   -     66           66    +66
7    Humaira (IRE)        3    60.0    7    13.75    3.5   -     66           66    +66
8    Lady William         3    60.0    8    18.25    3.5   59    66           66    +7
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Ada Lovelace 60 72 66 +6 2.5 -
2 Gathering Winter Line 68 68 68 ✓ Match 2.5
3 Greenandgold - - 66 -66 3.5 -
4 Charleston Dawn 60 61 68 -7 2.5 -
5 Wispinthewillow 73 71 66 +5 3.5 -
6 Banana Split - - 66 -66 3.5 -
7 Humaira (IRE) - - 66 -66 3.5 -
8 Lady William 59 59 66 -7 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