Official NHA Assessment

Race 2: JOIN THE RACE COAST TURF CLUB MAIDEN PLATE (F & M) (For Maiden Fillies and Mares)

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Line Horse
Swift Serenity
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
4 / 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    Black Erika          2    60.0    1    0.00     4.0   -     76           6     +6
2    Swift Serenity       2    60.0    2    1.25     4.0   76    76           76    +0
3    Fantine              3    60.0    3    2.75     6.0   -     72           72    +72
4    Winter In Auckland   2    60.0    4    3.25     4.0   -     76           76    +76
5    Spurious             3    60.0    5    4.75     6.0   -     72           72    +72
6    Walk Right In        2    60.0    6    6.00     4.0   67    76           76    +9
7    Half Full            2    56.0    7    6.75     4.0   66    68           68    +2
8    Ginger Rood          3    58.5    8    11.25    6.0   -     69           69    +69
9    Bluffton             3    60.0    9    11.35    6.0   -     72           72    +72
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Black Erika - 79 6 +73 4.0 -
2 Swift Serenity Line 76 74 76 -2 4.0
3 Fantine - 70 72 -2 6.0 -
4 Winter In Auckland - 74 76 -2 4.0 -
5 Spurious - 74 72 +2 6.0 -
6 Walk Right In 67 69 76 -7 4.0 -
7 Half Full 66 60 68 -8 4.0 -
8 Ginger Rood - 53 69 -16 6.0 -
9 Bluffton - 48 72 -24 6.0 -
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