Official NHA Assessment

Race 4: FEVER TREE STAKES (For all horses. Non-Black Type)

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Line Horse
Narina Trogon
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
1 / 7
Within 2 points
Significant Diffs
1 / 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    African Skyline      6    55.0    1    0.00     0.0   97    95           95    -2
2    Field Marshal        3    52.0    2    0.30     4.0   98    86           88    -10
3    Narina Trogon        5    59.5    3    2.30     0.0   106   106          106   +0
4    Formagear            5    61.0    4    2.80     0.0   108   109          109   +1
5    Imilenzeyokududuma   6    62.5    5    2.90     0.0   114   112          112   -2
6    Malcolm's Dream      6    50.0    6    5.20     0.0   90    85           85    -5
7    Diani                5    58.0    7    7.00     0.0   101   101          101   +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 African Skyline 97 98 95 +3 0.0 -
2 Field Marshal 98 107 88 +19 4.0 -
3 Narina Trogon Line 106 102 106 -4 0.0
4 Formagear 108 108 109 -1 0.0 -
5 Imilenzeyokududuma 114 109 112 -3 0.0 -
6 Malcolm's Dream 90 88 85 +3 0.0 -
7 Diani 101 96 101 -5 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