Official NHA Assessment

Race 1: WELCOME TO NELSON MANDELA BAY MAIDEN PLATE (For 3 year-olds) (For Maiden 3 year-olds)

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Line Horse
Siberian Fox
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
1 / 7
Within 2 points
Significant Diffs
5 / 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    Russian Empire       5    58.5    1    0.00     0.0   78    74           70    -8
2    Potente              2    60.0    2    1.25     7.0   75    63           65    -10
3    Siberian Fox         2    60.0    3    1.75     7.0   63    63           63    +0
4    This Time Round      2    60.0    4    3.00     7.0   57    63           63    +6
5    Stepdance            2    60.0    5    5.75     7.0   -     63           63    +63
6    Davey Crockett       2    60.0    6    8.00     7.0   54    63           63    +9
7    Double Duty          2    57.5    7    15.00    7.0   -     58           58    +58
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Russian Empire 78 53 70 -17 0.0 -
2 Potente 75 60 65 -5 7.0 -
3 Siberian Fox Line 63 62 63 -1 7.0
4 This Time Round 57 54 63 -9 7.0 -
5 Stepdance - 57 63 -6 7.0 -
6 Davey Crockett 54 50 63 -13 7.0 -
7 Double Duty - - 58 -58 7.0 -
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