Official NHA Assessment

Race 4: Greyville Convention Centre CLASS 4 (F & M) (For Fillies & Mares. Benchmark at 60.0kg = 82)

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Line Horse
Vision To Achieve
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
2 / 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    Perfume Power        2    58.5    1    0.00     3.5   86    87           87    +1
2    Arverni Princess     2    49.5    2    1.20     3.5   66    69           69    +3
3    Call Me Jane         3    55.5    3    1.50     5.0   73    78           78    +5
4    Vision To Achieve    4    59.5    4    1.80     6.0   84    84           84    +0
5    Clickbait            3    55.5    5    2.85     5.0   73    78           78    +5
6    Million Voices       2    59.5    6    3.35     3.5   81    89           89    +8
7    Crafty Crofty        2    57.5    7    6.35     3.5   89    85           85    -4
8    Queen Braganza       3    60.0    8    6.60     5.0   89    87           87    -2
9    Faithful Neo         3    60.5    9    8.00     5.0   83    88           88    +5
10   Snow Queen           2    54.5    10   17.90    3.5   78    79           79    +1
99   Celestial Diamond    2    57.5    99   0.00     3.5   -     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 Perfume Power 86 90 87 +3 3.5 -
2 Arverni Princess 66 67 69 -2 3.5 -
3 Call Me Jane 73 72 78 -6 5.0 -
4 Vision To Achieve Line 84 87 84 +3 6.0
5 Clickbait 73 73 78 -5 5.0 -
6 Million Voices 81 77 89 -12 3.5 -
7 Crafty Crofty 89 80 85 -5 3.5 -
8 Queen Braganza 89 94 87 +7 5.0 -
9 Faithful Neo 83 80 88 -8 5.0 -
10 Snow Queen 78 68 79 -11 3.5 -
99 Celestial Diamond - 84 85 -1 3.5 -
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