Official NHA Assessment

Race 4: JOHAN VAN DER LINDEN, NICK BLIGNAUT, JACOBUS VILJOEN FM 92 HANDICAP (F & M) (For Fillies and Mares)

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Line Horse
Donna Mo
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
2 / 7
Within 2 points
Significant Diffs
5 / 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    I Am Regal           5    52.0    1    0.00     0.0   76    80           76    +0
2    Donna Mo             2    56.0    2    1.90     0.0   91    91           91    +0
3    Opera Glass          4    57.0    3    3.00     1.5   86    89           89    +3
4    Special Charm        3    55.0    4    4.30     3.5   82    79           79    -3
5    Bellevarde           3    58.0    5    4.70     3.5   96    85           86    -10
6    Alphabetty           5    54.5    6    8.25     0.0   81    85           85    +4
7    Elembee              5    55.5    7    9.50     0.0   83    87           87    +4
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 I Am Regal 76 75 76 -1 0.0 -
2 Donna Mo Line 91 89 91 -2 0.0
3 Opera Glass 86 81 89 -8 1.5 -
4 Special Charm 82 104 79 +25 3.5 -
5 Bellevarde 96 107 86 +21 3.5 -
6 Alphabetty 81 71 85 -14 0.0 -
7 Elembee 83 77 87 -10 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