Official NHA Assessment

Race 1: WELCOME TO NELSON MANDELA BAY MAIDEN JUVENILE PLATE (Fillies) (For 2 year old fillies)

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Line Horse
None identified
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
0 / 7
Within 2 points
Significant Diffs
7 / 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    Stage Play           2    60.0    1    0.00     1.0   -     -            -     +0
2    Peace Frog           2    60.0    2    1.00     1.0   -     -            -     +0
3    Butterfly Queen      2    60.0    3    1.25     1.0   -     -            -     +0
4    Si Gioca             2    60.0    4    1.75     1.0   -     -            -     +0
5    Winning Grace        2    60.0    5    2.50     1.0   -     -            -     +0
6    Fly Like A Falcon    2    60.0    6    4.75     1.0   -     -            -     +0
7    Exclusively Yours    2    60.0    7    10.00    1.0   -     -            -     +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Stage Play - 73 - +73 1.0 -
2 Peace Frog - 71 - +71 1.0 -
3 Butterfly Queen - 63 - +63 1.0 -
4 Si Gioca - 62 - +62 1.0 -
5 Winning Grace - 62 - +62 1.0 -
6 Fly Like A Falcon - 58 - +58 1.0 -
7 Exclusively Yours - 73 - +73 1.0 -
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