Official NHA Assessment

Race 4: SA DERBY 4 APRIL MAIDEN PLATE (For all Maidens)

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Line Horse
Willow Charm
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
1 / 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    Warning Light        3    60.0    1    0.00     4.5   -     67           6     +6
2    Taskmaster (ARG)     2    60.0    2    1.80     3.0   77    70           70    -7
3    Willow Charm         2    60.0    3    5.60     3.0   70    70           70    +0
4    Stokesy              3    60.0    4    11.60    4.5   78    67           68    -10
5    Scorpio              2    60.0    5    15.00    3.0   75    70           70    -5
6    Sky Pilot            3    60.0    6    17.00    4.5   78    67           68    -10
7    Fred Frizzle         3    58.5    7    18.50    4.5   -     64           64    +64
99   Forever Canford      2    60.0    99   0.00     3.0   -     70           70    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Warning Light - 86 6 +80 4.5 -
2 Taskmaster (ARG) 77 79 70 +9 3.0 -
3 Willow Charm Line 70 70 70 ✓ Match 3.0
4 Stokesy 78 81 68 +13 4.5 -
5 Scorpio 75 75 70 +5 3.0 -
6 Sky Pilot 78 76 68 +8 4.5 -
7 Fred Frizzle - 45 64 -19 4.5 -
99 Forever Canford - 67 70 -3 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