Official NHA Assessment

Race 8: HSH PRINCESS CHARLENE EMPRESS CLUB STAKES (Grade 1) (For Fillies and Mares at Weight-for-Age)

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Line Horse
Marigold Hotel
Reference for assessment
Exact Matches
1 / 7
Calculated = Official
Close Matches
2 / 7
Within 2 points
Significant Diffs
3 / 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    Desert Miracle       3    60.0    1    0.00     2.5   124   107          107   -17
2    Feather Boa          2    57.5    2    1.25     0.0   108   111          111   +3
3    Marigold Hotel       3    60.0    3    5.00     2.5   107   107          107   +0
4    Under Your Spell     3    60.0    4    5.25     2.5   114   107          107   -7
5    Humdinger            3    60.0    5    9.25     2.5   108   107          107   -1
6    Miss Daisy           2    57.5    6    11.75    0.0   108   107          107   -1
7    Gimme A Shot         2    57.5    7    14.00    0.0   113   107          107   -6
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Desert Miracle 124 124 107 +17 2.5 -
2 Feather Boa 108 114 111 +3 0.0 -
3 Marigold Hotel Line 107 107 107 ✓ Match 2.5
4 Under Your Spell 114 113 107 +6 2.5 -
5 Humdinger 108 119 107 +12 2.5 -
6 Miss Daisy 108 108 107 +1 0.0 -
7 Gimme A Shot 113 110 107 +3 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