Official NHA Assessment

Race 5: SA DERBY 4 APRIL FM 79 DIVIDED HANDICAP (F & M) (For Fillies and Mares)

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Line Horse
Lady Blunt
Reference for assessment
Exact Matches
4 / 11
Calculated = Official
Close Matches
6 / 11
Within 2 points
Significant Diffs
5 / 11
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    Duchess Of Paloma    3    59.0    1    0.00     5.0   77    77           77    +0
2    Special Star         2    56.5    2    4.40     0.0   82    82           82    +0
3    Lady Blunt           2    59.5    3    5.50     0.0   88    88           88    +0
4    Rosy Lemon           5    56.5    4    5.75     0.0   72    82           82    +10
5    Artic Silver         3    56.0    5    5.80     5.0   79    71           71    -8
6    Chickasaw            2    54.0    6    6.80     0.0   76    77           77    +1
7    Kensal Green         2    55.5    7    7.10     0.0   80    80           80    +0
8    Surprise Party       2    57.0    8    7.80     0.0   83    83           83    +0
9    Ariel's Jet          3    54.5    9    8.20     5.0   73    68           68    -5
99   Into Dancing         2    51.5    99   0.00     0.0   -     72           72    +0
99   Merryweather         2    59.5    99   0.00     0.0   -     88           88    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Duchess Of Paloma 77 91 77 +14 5.0 -
2 Special Star 82 82 82 ✓ Match 0.0 -
3 Lady Blunt Line 88 88 88 ✓ Match 0.0
4 Rosy Lemon 72 72 82 -10 0.0 -
5 Artic Silver 79 77 71 +6 5.0 -
6 Chickasaw 76 67 77 -10 0.0 -
7 Kensal Green 80 79 80 -1 0.0 -
8 Surprise Party 83 83 83 ✓ Match 0.0 -
9 Ariel's Jet 73 69 68 +1 5.0 -
99 Into Dancing - 85 72 +13 0.0 -
99 Merryweather - 88 88 ✓ Match 0.0 -
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