Official NHA Assessment

Race 5: STORM BIRD STAKES (Listed) (For 2 yo Fillies.R60 000 Win BSA Bonus Series)

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Line Horse
None identified
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
0 / 7
Within 2 points
Significant Diffs
5 / 7
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    Karangetang          2    57.0    1    0.00     3.0   -     -            -     +0
2    Arividicio           5    57.0    2    2.50     0.0   -     -            -     +0
3    Magic Tattoo         5    60.0    3    6.00     0.0   -     -            -     +0
4    Above The World      2    54.5    4    11.25    3.0   -     -            -     +0
5    Ode To The Ocean     2    57.5    5    23.50    3.0   -     -            -     +0
99   Vartacus             2    57.0    99   0.00     3.0   -     -            -     +0
99   Power Broker         2    60.0    99   0.00     3.0   -     -            -     +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Karangetang - 95 - +95 3.0 -
2 Arividicio - 50 - +50 0.0 -
3 Magic Tattoo - 93 - +93 0.0 -
4 Above The World - 63 - +63 3.0 -
5 Ode To The Ocean - 62 - +62 3.0 -
99 Vartacus - 78 - - 3.0 -
99 Power Broker - 102 - - 3.0 -
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