Official NHA Assessment

Race 9: KLAWERVLEI STUD CLASS 5 (Open. Benchmark at 60.0kg = 66)

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Line Horse
Trippi's Silk
Reference for assessment
Exact Matches
2 / 9
Calculated = Official
Close Matches
4 / 9
Within 2 points
Significant Diffs
3 / 9
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    Tambourine Man       5    56.0    1    0.00     0.0   58    68           64    +6
2    Trippi's Silk        4    62.5    2    0.30     5.0   71    71           71    +0
3    Maritzburg Memory    2    59.5    3    1.30     3.0   71    69           69    -2
4    Tres Chic            4    60.0    4    2.80     5.0   66    66           66    +0
5    Augusta Blue         5    62.0    5    3.55     0.0   70    80           80    +10
6    Lovers Lane          2    54.5    6    4.30     3.0   55    59           59    +4
7    Champagne Mac        4    59.5    7    4.80     5.0   65    65           65    +0
8    The Postman          2    52.0    8    8.55     3.0   51    54           54    +3
99   Lady Loxton          4    55.5    99   0.00     5.0   -     57           57    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Tambourine Man 58 64 64 ✓ Match 0.0 -
2 Trippi's Silk Line 71 73 71 +2 5.0
3 Maritzburg Memory 71 74 69 +5 3.0 -
4 Tres Chic 66 52 66 -14 5.0 -
5 Augusta Blue 70 69 80 -11 0.0 -
6 Lovers Lane 55 58 59 -1 3.0 -
7 Champagne Mac 65 55 65 -10 5.0 -
8 The Postman 51 51 54 -3 3.0 -
99 Lady Loxton - 57 57 ✓ Match 5.0 -
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