Official NHA Assessment

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

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Line Horse
None identified
Reference for assessment
Exact Matches
0 / 5
Calculated = Official
Close Matches
0 / 5
Within 2 points
Significant Diffs
4 / 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    Duchess Of War       2    57.5    1    0.00     2.5   -     -            -     +0
2    Evocative            3    57.5    2    0.50     3.5   -     -            -     +0
3    Aratula              3    60.0    3    5.50     3.5   -     -            -     +0
4    Onceajackpot         3    60.0    4    7.50     3.5   -     -            -     +0
5    Elmhurst             2    60.0    5    8.25     2.5   55    -            51    -4
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Duchess Of War - 55 - +55 2.5 -
2 Evocative - 44 - +44 3.5 -
3 Aratula - 45 - +45 3.5 -
4 Onceajackpot - 53 - +53 3.5 -
5 Elmhurst 55 56 51 +5 2.5 -
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