Official NHA Assessment

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

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Line Horse
Windsor Lane (ZIM)
Reference for assessment
Exact Matches
0 / 6
Calculated = Official
Close Matches
2 / 6
Within 2 points
Significant Diffs
4 / 6
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    Windsor Lane (ZIM)   4    57.0    1    0.00     0.5   48    48           48    +0
2    Testify              2    56.0    2    1.00     0.0   -     51           51    +51
3    Bruce's Spirit       6    60.0    3    3.00     0.0   51    57           57    +6
4    Lady Emma Hamilton   2    53.0    4    4.00     0.0   -     42           42    +42
99   Star Aglow           3    57.0    99   0.00     1.0   -     47           47    +0
99   Royal Obsession      3    60.0    99   0.00     1.0   -     53           53    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Windsor Lane (ZIM) Line 48 49 48 +1 0.5
2 Testify - 71 51 +20 0.0 -
3 Bruce's Spirit 51 55 57 -2 0.0 -
4 Lady Emma Hamilton - 57 42 +15 0.0 -
99 Star Aglow - 74 47 +27 1.0 -
99 Royal Obsession - 37 53 -16 1.0 -
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