Official NHA Assessment

Race 4: MERIT RATED 80 HANDICAP (Open)

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Line Horse
Jacky Sparrow
Reference for assessment
Exact Matches
1 / 5
Calculated = Official
Close Matches
3 / 5
Within 2 points
Significant Diffs
2 / 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    Red Top              5    55.0    1    0.00     0.0   68    73           68    +0
2    Jacky Sparrow        3    60.0    2    0.50     2.5   78    78           78    +0
3    Gypsy Express        5    56.0    3    4.50     0.0   70    75           75    +5
4    Karvani              7    52.0    4    4.60     0.0   62    67           67    +5
99   Star Aglow           3    58.0    99   0.00     2.5   -     74           74    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Red Top 68 70 68 +2 0.0 -
2 Jacky Sparrow Line 78 80 78 +2 2.5
3 Gypsy Express 70 58 75 -17 0.0 -
4 Karvani 62 73 67 +6 0.0 -
99 Star Aglow - 74 74 ✓ Match 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