Official NHA Assessment

Race 2: BET WITH TOTE B STAKES (For All Horses with a nett rating of 101 & below)

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Line Horse
Kalahari Roller
Reference for assessment
Exact Matches
0 / 6
Calculated = Official
Close Matches
1 / 6
Within 2 points
Significant Diffs
4 / 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    Jet Legacy           5    51.5    1    0.00     0.0   81    76           76    -5
2    Major Tommie         3    53.0    2    0.40     1.5   83    76           76    -7
3    Kalahari Roller      3    60.0    3    3.20     1.5   90    90           90    +0
4    Mojo Man             4    56.0    4    3.40     2.0   89    81           81    -8
5    Lady Of Vix          2    49.0    5    5.20     0.5   80    70           70    -10
6    Boom Shakalaka       2    52.5    6    5.60     0.5   68    77           77    +9
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Jet Legacy 81 89 76 +13 0.0 -
2 Major Tommie 83 94 76 +18 1.5 -
3 Kalahari Roller Line 90 86 90 -4 1.5
4 Mojo Man 89 80 81 -1 2.0 -
5 Lady Of Vix 80 80 70 +10 0.5 -
6 Boom Shakalaka 68 57 77 -20 0.5 -
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