Official NHA Assessment

Race 2: JACKY SPARROW MERIT RATED 61 HANDICAP (Open)

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Line Horse
Jet Green
Reference for assessment
Exact Matches
0 / 4
Calculated = Official
Close Matches
0 / 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    Prince Of Denmark    4    57.0    1    0.00     2.0   55    53           55    +0
2    Jet Green            4    60.0    2    3.00     2.0   61    61           61    +0
3    Copper Fire          3    56.5    3    4.25     4.0   62    49           52    -10
4    When Evening Comes   5    59.0    4    4.50     0.0   59    61           61    +2
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Prince Of Denmark 55 51 55 -4 2.0 -
2 Jet Green Line 61 54 61 -7 2.0
3 Copper Fire 62 60 52 +8 4.0 -
4 When Evening Comes 59 58 61 -3 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