Official NHA Assessment

Race 1: WELCOME TO NELSON MANDELA BAY OPEN MAIDEN (F & M) (For Maidens F&M. R15 000 Win bonus ROA Members)

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Line Horse
Sierra Sky
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
2 / 8
Within 2 points
Significant Diffs
5 / 8
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    Elusive Hunter       4    53.5    1    0.00     5.0   53    56           56    +3
2    Ruby Claire          3    57.5    2    2.00     8.0   76    61           66    -10
3    Sierra Sky           3    52.5    3    3.25     8.0   50    50           50    +0
4    Natural Wonder       3    51.5    4    3.50     8.0   64    47           54    -10
5    Karoo Bokkie         2    59.0    5    5.75     0.0   -     77           77    +77
6    Very Var Var         2    59.0    6    15.00    0.0   -     77           77    +77
7    Poise Panache        6    61.0    7    17.25    0.0   -     81           81    +81
8    Mad World            3    54.0    8    29.75    8.0   53    51           51    -2
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Elusive Hunter 53 50 56 -6 5.0 -
2 Ruby Claire 76 52 66 -14 8.0 -
3 Sierra Sky Line 50 45 50 -5 8.0
4 Natural Wonder 64 55 54 +1 8.0 -
5 Karoo Bokkie - 68 77 -9 0.0 -
6 Very Var Var - 48 77 -29 0.0 -
7 Poise Panache - 40 81 -41 0.0 -
8 Mad World 53 53 51 +2 8.0 -
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