Official NHA Assessment

Race 4: CLASSIC DAY 7 MARCH MAIDEN PLATE (For all Maidens)

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Line Horse
Stoneywood
Reference for assessment
Exact Matches
1 / 7
Calculated = Official
Close Matches
1 / 7
Within 2 points
Significant Diffs
4 / 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    Fiery Rose           2    57.5    1    0.00     3.5   83    -2           -     -83
2    Stoneywood           3    60.0    2    3.40     5.0   -     -            -     +0
3    Kambati              4    60.0    3    6.00     6.0   -     -2           -     +0
4    Rockabilly           3    60.0    4    7.25     5.0   -     -            -     +0
5    Hurricane Power      2    53.5    5    8.25     3.5   69    -10          59    -10
6    Surreal Song         2    58.0    6    11.25    3.5   -     -1           -     +0
99   Jammy Dodger         3    57.5    99   0.00     5.0   -     -5           -5    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Fiery Rose 83 90 - +90 3.5 -
2 Stoneywood Line - 88 - +88 5.0
3 Kambati - 75 - +75 6.0 -
4 Rockabilly - 74 - +74 5.0 -
5 Hurricane Power 69 63 59 +4 3.5 -
6 Surreal Song - - - ✓ Match 3.5 -
99 Jammy Dodger - - -5 +5 5.0 -
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