Official NHA Assessment

Race 1: WSB Max Payout R30Mil MAIDEN PLATE (F & M) (For Maiden Fillies & Mares)

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Line Horse
Head Girl
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
3 / 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    Chakpori             3    59.0    1    0.00     7.5   72    47           47    -25
2    Head Girl            5    60.0    2    0.40     0.0   64    64           64    +0
3    Mistress Rebecca     3    59.0    3    4.20     7.5   -     47           47    +47
4    Di Rosa              4    60.0    4    6.60     9.0   62    46           52    -10
5    Lightinthedarkness   3    59.0    5    7.40     7.5   63    47           53    -10
6    Admirals Queen       2    57.5    6    9.00     5.0   52    49           49    -3
7    Princess Goldie      3    59.0    7    12.20    7.5   -     47           47    +47
8    Lady Smallwood       3    59.0    8    14.90    7.5   -     47           47    +47
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Chakpori 72 64 47 +17 7.5 -
2 Head Girl Line 64 62 64 -2 0.0
3 Mistress Rebecca - 62 47 +15 7.5 -
4 Di Rosa 62 54 52 +2 9.0 -
5 Lightinthedarkness 63 59 53 +6 7.5 -
6 Admirals Queen 52 47 49 -2 5.0 -
7 Princess Goldie - 73 47 +26 7.5 -
8 Lady Smallwood - - 47 -47 7.5 -
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