Official NHA Assessment

Race 2: OPEN A tabGOLD ACCOUNT - 031 314 1874 MAIDEN PLATE (3-year-old Fillies) (For Maiden 3-year-old Fillies)

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Line Horse
Isn't She Bonny
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
0 / 8
Within 2 points
Significant Diffs
8 / 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    Spirited Flight      5    60.0    1    0.00     0.0   -     16           6     +6
2    La Pura Vida         2    60.0    2    0.05     6.5   -     3            3     +3
3    Isn't She Bonny      2    58.5    3    0.10     6.5   -     -            -     +0
4    Madame Zee           3    60.0    4    5.20     9.5   -     -3           -     +0
5    French Princess      2    60.0    5    7.80     6.5   -     3            3     +3
6    Blazing Kiss         3    60.0    6    8.60     9.5   -     -3           -     +0
7    Roy's Caviar         3    60.0    7    10.50    9.5   -     -3           -     +0
8    Sundog               3    60.0    8    11.90    9.5   -     -3           -     +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Spirited Flight - 61 6 +55 0.0 -
2 La Pura Vida - 77 3 +74 6.5 -
3 Isn't She Bonny Line - 71 - +71 6.5
4 Madame Zee - 69 - +69 9.5 -
5 French Princess - 65 3 +62 6.5 -
6 Blazing Kiss - 75 - +75 9.5 -
7 Roy's Caviar - 49 - +49 9.5 -
8 Sundog - 33 - +33 9.5 -
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