Official NHA Assessment

Race 5: SA DERBY 4 APRIL MAIDEN PLATE (For all Maidens)

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Line Horse
Royale Jacket
Reference for assessment
Exact Matches
2 / 11
Calculated = Official
Close Matches
4 / 11
Within 2 points
Significant Diffs
6 / 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    Sand Script          3    57.0    1    0.00     4.5   -     57           6     +6
2    Royale Jacket        2    60.0    2    3.00     0.0   74    74           74    +0
3    Gimmesumluv          3    57.0    3    4.30     4.5   72    57           62    -10
4    Pompeii Shield       4    60.0    4    6.40     2.0   69    68           68    -1
5    Cuzzie               3    60.0    5    6.90     4.5   53    63           63    +10
6    Epidaurus            3    60.0    6    13.10    4.5   65    63           63    -2
7    Afterburn            3    60.0    7    13.35    4.5   65    63           63    -2
8    Jabberwocky          4    60.0    8    14.35    2.0   56    68           68    +12
9    Sivaji               3    60.0    9    16.60    4.5   -     63           63    +63
10   Alhakim              2    58.5    10   99.99    0.0   58    69           69    +11
99   Come Together        3    57.0    99   0.00     4.5   -     57           57    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Sand Script - 78 6 +72 4.5 -
2 Royale Jacket Line 74 74 74 ✓ Match 0.0
3 Gimmesumluv 72 69 62 +7 4.5 -
4 Pompeii Shield 69 69 68 +1 2.0 -
5 Cuzzie 53 54 63 -9 4.5 -
6 Epidaurus 65 63 63 ✓ Match 4.5 -
7 Afterburn 65 62 63 -1 4.5 -
8 Jabberwocky 56 53 68 -15 2.0 -
9 Sivaji - 60 63 -3 4.5 -
10 Alhakim 58 58 69 -11 0.0 -
99 Come Together - 70 57 +13 4.5 -
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