Official NHA Assessment

Race 7: HENNIE VAN WYK, NICK BLIGNAUT, JACOBUS VILJOEN MIDDLE STAKES (For All Horses)

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Line Horse
Vanakkam
Reference for assessment
Exact Matches
1 / 7
Calculated = Official
Close Matches
1 / 7
Within 2 points
Significant Diffs
4 / 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    Poblano              3    58.0    1    0.00     3.0   100   106          106   +6
2    Vanakkam             2    50.5    2    0.60     2.0   93    93           93    +0
3    Salute The Flag      3    47.5    3    2.10     3.0   81    85           85    +4
4    Chapbook             2    62.0    4    2.40     2.0   106   116          116   +10
5    Rafa Bay             2    58.0    5    5.50     2.0   96    108          108   +12
6    Chieftain            3    62.5    6    6.00     3.0   106   115          115   +9
7    Fire 'N Flames       4    62.0    7    6.25     3.5   103   113          113   +10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Poblano 100 103 106 -3 3.0 -
2 Vanakkam Line 93 93 93 ✓ Match 2.0
3 Salute The Flag 81 81 85 -4 3.0 -
4 Chapbook 106 106 116 -10 2.0 -
5 Rafa Bay 96 96 108 -12 2.0 -
6 Chieftain 106 105 115 -10 3.0 -
7 Fire 'N Flames 103 103 113 -10 3.5 -
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