Official NHA Assessment

Race 7: CELEBRATING CENTURION MEMBER SUZETTE VILJOEN'S BIRTHDAY C STAKES (For All Horses with a nett rating of 83 & below)

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Line Horse
Prime Venture
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
6 / 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    Dubbelosix           3    60.0    1    0.00     3.5   82    73           73    -9
2    Baton Rouge          4    51.5    2    2.25     1.5   62    63           63    +1
3    Express Yourself     2    64.0    3    2.55     0.0   86    90           90    +4
4    My Bestie            7    61.5    4    5.55     0.0   78    83           83    +5
5    Prime Venture        3    61.5    5    5.95     3.5   76    76           76    +0
6    Repetition           3    58.5    6    6.45     3.5   78    70           70    -8
7    Hiawatha Goldberg    2    57.0    7    15.45    0.0   67    74           74    +7
8    Petteia              2    51.0    8    19.70    0.0   52    62           62    +10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Dubbelosix 82 84 73 +11 3.5 -
2 Baton Rouge 62 69 63 +6 1.5 -
3 Express Yourself 86 74 90 -16 0.0 -
4 My Bestie 78 61 83 -22 0.0 -
5 Prime Venture Line 76 78 76 +2 3.5
6 Repetition 78 74 70 +4 3.5 -
7 Hiawatha Goldberg 67 57 74 -17 0.0 -
8 Petteia 52 50 62 -12 0.0 -
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