Official NHA Assessment

Race 8: umTHOMBOTHI STAKES (For all Horses. Non-Black Type)

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Line Horse
Isivivane
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
7 / 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    King Pelles          3    62.5    1    0.00     5.0   122   102          102   -20
2    Go Grayson Go        3    56.5    2    1.30     5.0   95    95           95    +0
3    Isivivane            3    58.0    3    1.80     5.0   98    98           98    +0
4    Down By The River    2    56.5    4    4.10     0.0   95    102          102   +7
5    Cape Eagle           7    62.5    5    6.70     0.0   108   112          112   +4
6    Trois Trois Quatre   5    55.0    6    8.00     0.0   92    97           97    +5
7    Gimmefabulous        3    58.5    7    8.40     5.0   103   94           94    -9
8    Amor Fati            2    55.5    8    20.10    0.0   92    98           98    +6
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 King Pelles 122 122 102 +20 5.0 -
2 Go Grayson Go 95 95 95 ✓ Match 5.0 -
3 Isivivane Line 98 104 98 +6 5.0
4 Down By The River 95 95 102 -7 0.0 -
5 Cape Eagle 108 106 112 -6 0.0 -
6 Trois Trois Quatre 92 87 97 -10 0.0 -
7 Gimmefabulous 103 103 94 +9 5.0 -
8 Amor Fati 92 92 98 -6 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