Official NHA Assessment

Race 2: ROBYN KLAASEN MAIDEN PLATE (F & M) (For Maiden F & M)

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Line Horse
Quiet Winter
Reference for assessment
Exact Matches
2 / 8
Calculated = Official
Close Matches
2 / 8
Within 2 points
Significant Diffs
6 / 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    Perfect Miracle      3    58.0    1    0.00     10.5  -     -7           -     +0
2    Lost For Words       2    60.0    2    6.25     7.0   -     4            4     +4
3    Quiet Winter         2    58.0    3    8.45     7.0   -     -            -     +0
4    Total Eruption       3    56.5    4    10.55    10.5  -     -10          -     +0
5    Erebus               2    58.0    5    11.75    7.0   -     -            -     +0
6    Manuriki             2    58.0    6    12.25    7.0   -     -            -     +0
7    Storm Crest          3    58.0    7    23.00    10.5  -     -7           -     +0
8    Forbidden Fruit      3    58.0    8    99.99    10.5  -     -7           -     +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Perfect Miracle - 96 - +96 10.5 -
2 Lost For Words - 81 4 +77 7.0 -
3 Quiet Winter Line - 79 - +79 7.0
4 Total Eruption - 62 - +62 10.5 -
5 Erebus - 66 - +66 7.0 -
6 Manuriki - 52 - +52 7.0 -
7 Storm Crest - - - ✓ Match 10.5 -
8 Forbidden Fruit - - - ✓ Match 10.5 -
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