Official NHA Assessment

Race 4: RIETHUISKRAAL STUD CLASS 3 (Open. Benchmark at 60.0kg = 96)

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Line Horse
Night Bomber
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
3 / 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    Dumbledore           4    56.5    1    0.00     4.5   90    87           87    -3
2    Bjorn Ironside       2    59.0    2    0.40     0.0   108   106          106   -2
3    Night Bomber         4    55.0    3    1.90     4.5   87    87           87    +0
4    Surge Of Power       2    56.5    4    3.65     0.0   103   97           97    -6
5    Zoomie               2    57.5    5    4.15     0.0   91    99           99    +8
6    War Chariot          4    53.0    6    4.55     4.5   83    80           80    -3
7    Black Egret          3    60.0    7    5.30     7.0   96    89           89    -7
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Dumbledore 90 105 87 +18 4.5 -
2 Bjorn Ironside 108 105 106 -1 0.0 -
3 Night Bomber Line 87 96 87 +9 4.5
4 Surge Of Power 103 80 97 -17 0.0 -
5 Zoomie 91 86 99 -13 0.0 -
6 War Chariot 83 82 80 +2 4.5 -
7 Black Egret 96 90 89 +1 7.0 -
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