Official NHA Assessment

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

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Line Horse
Bruce's Spirit
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
0 / 7
Within 2 points
Significant Diffs
6 / 7
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    Jacky Sparrow        3    57.5    1    0.00     5.0   -     34           6     +6
2    Red Top              5    60.0    2    2.50     0.0   -     51           51    +51
3    Bruce's Spirit       6    60.0    3    3.75     0.0   50    50           50    +0
4    Walking Thru Time    3    57.5    4    6.75     5.0   -     34           34    +34
5    Elmhurst             2    60.0    5    10.25    0.0   58    49           49    -9
6    Kallipos             3    60.0    6    17.25    5.0   -     39           39    +39
99   Duchess Of War       2    57.5    99   0.00     0.0   -     44           44    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Jacky Sparrow - 80 6 +74 5.0 -
2 Red Top - 70 51 +19 0.0 -
3 Bruce's Spirit Line 50 55 50 +5 0.0
4 Walking Thru Time - 73 34 +39 5.0 -
5 Elmhurst 58 56 49 +7 0.0 -
6 Kallipos - 63 39 +24 5.0 -
99 Duchess Of War - 55 44 +11 0.0 -
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