Official NHA Assessment

Race 4: JOHAN VAN DER LINDEN, NICK BLIGNAUT, JACOBUS VILJOEN MAIDEN PLATE (F & M) (For Maiden F & M. R15 000 Win bonus ROA Membe

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Line Horse
Broadlands
Reference for assessment
Exact Matches
3 / 8
Calculated = Official
Close Matches
4 / 8
Within 2 points
Significant Diffs
3 / 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    Radu                 5    60.0    1    0.00     0.0   70    73           70    +0
2    Broadlands           3    60.0    2    3.50     2.5   69    69           69    +0
3    Idabelle             2    60.0    3    4.60     0.0   53    73           73    +20
4    Dusky Rose           3    60.0    4    7.85     2.5   55    68           68    +13
5    Keep The Fort        3    60.0    5    8.35     2.5   74    68           68    -6
6    Secret Recipe        5    60.0    6    14.35    0.0   -     73           73    +73
7    Aunt Pittypat        3    58.5    7    14.60    2.5   64    65           65    +1
8    Lady Dynamo          3    60.0    8    19.10    2.5   -     68           68    +68
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Radu 70 64 70 -6 0.0 -
2 Broadlands Line 69 69 69 ✓ Match 2.5
3 Idabelle 53 70 73 -3 0.0 -
4 Dusky Rose 55 58 68 -10 2.5 -
5 Keep The Fort 74 66 68 -2 2.5 -
6 Secret Recipe - 73 73 ✓ Match 0.0 -
7 Aunt Pittypat 64 65 65 ✓ Match 2.5 -
8 Lady Dynamo - 61 68 -7 2.5 -
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