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
Princess Calla
Reference for assessment
Exact Matches
0 / 13
Calculated = Official
Close Matches
1 / 13
Within 2 points
Significant Diffs
11 / 13
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    Princess Calla       4    60.0    1    0.00     1.0   121   121          121   +0
2    Under Your Spell     3    57.5    2    0.75     2.5   114   117          117   +3
3    Sparkling Water      4    60.0    3    2.75     1.0   114   123          123   +9
4    Zarina               4    60.0    4    4.75     1.0   119   121          121   +2
5    Marigold Hotel       3    57.5    5    5.00     2.5   104   113          113   +9
6    Sprinkles            3    57.5    6    5.50     2.5   110   113          113   +3
7    She's A Keeper       5    60.0    7    5.75     0.0   116   123          123   +7
8    Bold Fortune         4    60.0    8    7.75     1.0   105   121          121   +16
9    Pretty Betty         4    60.0    9    8.25     1.0   100   121          121   +21
10   Mount Laurel         5    60.0    10   8.75     0.0   108   123          123   +15
11   Sentbydestiny        4    60.0    11   8.80     1.0   103   121          121   +18
12   Chat Ching           4    60.0    12   10.75    1.0   104   121          121   +17
13   Rouge Allure         8    60.0    13   11.50    0.0   94    123          123   +29
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Princess Calla Line 121 127 121 +6 1.0
2 Under Your Spell 114 113 117 -4 2.5 -
3 Sparkling Water 114 122 123 -1 1.0 -
4 Zarina 119 111 121 -10 1.0 -
5 Marigold Hotel 104 107 113 -6 2.5 -
6 Sprinkles 110 105 113 -8 2.5 -
7 She's A Keeper 116 117 123 -6 0.0 -
8 Bold Fortune 105 83 121 -38 1.0 -
9 Pretty Betty 100 94 121 -27 1.0 -
10 Mount Laurel 108 107 123 -16 0.0 -
11 Sentbydestiny 103 103 121 -18 1.0 -
12 Chat Ching 104 102 121 -19 1.0 -
13 Rouge Allure 94 103 123 -20 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