Official NHA Assessment

Race 6: LUCKY FISH MYSTIC FORTUNE D STAKES (For All Horses with a nett rating of 69 & below)

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Line Horse
Rosa Osiria
Reference for assessment
Exact Matches
1 / 9
Calculated = Official
Close Matches
2 / 9
Within 2 points
Significant Diffs
5 / 9
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    Country Time         5    51.5    1    0.00     0.0   52    66           58    +6
2    Du Maurier           2    61.5    2    3.25     6.5   80    73           73    -7
3    Gravity              4    56.0    3    3.55     11.0  59    53           53    -6
4    Rosa Osiria          3    60.5    4    4.05     9.5   65    65           65    +0
5    Easy Living          2    57.5    5    4.35     6.5   59    65           65    +6
6    Larking About        3    52.5    6    4.75     9.5   60    49           50    -10
7    Wylie Jack           6    60.0    7    5.05     0.0   61    83           83    +22
8    Hear My Voice        2    59.0    8    5.45     6.5   62    68           68    +6
9    Over The Atlantic    3    56.0    9    10.95    9.5   56    56           56    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Country Time 52 62 58 +4 0.0 -
2 Du Maurier 80 72 73 -1 6.5 -
3 Gravity 59 63 53 +10 11.0 -
4 Rosa Osiria Line 65 57 65 -8 9.5
5 Easy Living 59 52 65 -13 6.5 -
6 Larking About 60 55 50 +5 9.5 -
7 Wylie Jack 61 61 83 -22 0.0 -
8 Hear My Voice 62 54 68 -14 6.5 -
9 Over The Atlantic 56 56 56 ✓ Match 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