Official NHA Assessment

Race 4: RACEHORSE OWNERS ASSOCIATION MAIDEN PLATE (F & M) (For Maiden Fillies and Mares)

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Line Horse
Klaserie
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
2 / 8
Within 2 points
Significant Diffs
5 / 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    My Ami Beach         6    60.0    1    0.00     0.0   -     63           6     +6
2    Back To Formentera   3    60.0    2    2.25     2.5   55    58           58    +3
3    For All We Know      3    60.0    3    2.30     2.5   70    58           60    -10
4    Klaserie             3    60.0    4    4.80     2.5   58    58           58    +0
5    Antonia Augusta      2    57.0    5    4.85     1.5   -     54           54    +54
6    St Kitts             2    57.0    6    11.60    1.5   -     54           54    +54
7    Hola Chiquita        5    58.5    7    13.10    0.0   40    60           60    +20
8    Captain's Flower     3    60.0    8    28.35    2.5   59    58           58    -1
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 My Ami Beach - 70 6 +64 0.0 -
2 Back To Formentera 55 60 58 +2 2.5 -
3 For All We Know 70 79 60 +19 2.5 -
4 Klaserie Line 58 57 58 -1 2.5
5 Antonia Augusta - 57 54 +3 1.5 -
6 St Kitts - 63 54 +9 1.5 -
7 Hola Chiquita 40 38 60 -22 0.0 -
8 Captain's Flower 59 39 58 -19 2.5 -
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