Official NHA Assessment

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

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Line Horse
Firefly Lane
Reference for assessment
Exact Matches
1 / 4
Calculated = Official
Close Matches
2 / 4
Within 2 points
Significant Diffs
2 / 4
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    Tranquil Judi        3    57.0    1    0.00     2.5   -     39           6     +6
2    Queen Of Montmatre   3    57.0    2    3.50     2.5   39    40           40    +1
3    Firefly Lane         2    57.0    3    7.50     0.0   44    44           44    +0
4    Roman Law            3    60.0    4    10.50    2.5   -     45           45    +45
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Tranquil Judi - - 6 -6 2.5 -
2 Queen Of Montmatre 39 39 40 -1 2.5 -
3 Firefly Lane Line 44 44 44 ✓ Match 0.0
4 Roman Law - - 45 -45 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