Official NHA Assessment

Race 1: HOLLYWOODBETS DURBANVILLE WELCOMES YOU MAIDEN PLATE (F & M) (For Maiden Fillies and Mares)

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Line Horse
Strata
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
0 / 11
Within 2 points
Significant Diffs
10 / 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    Amethystic           2    60.0    1    0.00     6.5   68    95           74    +6
2    Strata               4    58.0    2    0.30     11.0  82    82           82    +0
3    Pink Moon            4    58.0    3    2.80     11.0  -     82           82    +82
4    Fanny Kemble         2    58.0    4    3.10     6.5   82    91           91    +9
5    Bright Duchess       2    58.0    5    4.85     6.5   -     91           91    +91
6    Head Girl            5    60.0    6    5.85     0.0   61    108          108   +47
7    Japanese Rose        3    58.0    7    6.25     9.5   -     85           85    +85
8    Citrus Delight       3    60.0    8    8.00     9.5   39    89           89    +50
9    Ponte Vecchio        2    60.0    9    9.00     6.5   63    95           95    +32
10   Gusto Girl           3    58.0    10   16.25    9.5   -     85           85    +85
99   Shout At The Moon    3    58.0    99   0.00     9.5   -     85           85    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Amethystic 68 50 74 -24 6.5 -
2 Strata Line 82 74 82 -8 11.0
3 Pink Moon - 54 82 -28 11.0 -
4 Fanny Kemble 82 68 91 -23 6.5 -
5 Bright Duchess - 82 91 -9 6.5 -
6 Head Girl 61 62 108 -46 0.0 -
7 Japanese Rose - 80 85 -5 9.5 -
8 Citrus Delight 39 50 89 -39 9.5 -
9 Ponte Vecchio 63 56 95 -39 6.5 -
10 Gusto Girl - 50 85 -35 9.5 -
99 Shout At The Moon - 45 85 -40 9.5 -
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