Official NHA Assessment

Race 1: WELCOME TO NELSON MANDELA BAY MAIDEN JUVENILE PLATE (For 2 yo R100 000 Win BSA / CRS Bonus)

Line Horse
None identified
Reference for assessment
Exact Matches
0 / 6
Calculated = Official
Close Matches
0 / 6
Within 2 points
Significant Diffs
5 / 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    Instaworthy          2    57.5    1    0.00     4.0   -     -            -     +0
2    Silva City           2    57.5    2    0.50     4.0   -     -            -     +0
3    Sports Fan           2    57.5    3    2.25     4.0   -     -            -     +0
4    Royal Missy          2    57.5    4    8.50     4.0   -     -            -     +0
5    Arlu                 2    60.0    5    9.75     4.0   -     -            -     +0
99   Mio Destino          2    60.0    99   0.00     4.0   -     -            -     +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Instaworthy - 107 - +107 4.0 -
2 Silva City - 99 - +99 4.0 -
3 Sports Fan - 92 - +92 4.0 -
4 Royal Missy - 83 - +83 4.0 -
5 Arlu - 68 - +68 4.0 -
99 Mio Destino - 69 - - 4.0 -
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