Official NHA Assessment

Race 1: WELCOME TO NELSON MANDELA BAY MAIDEN PLATE (For Maidens. R15 000 Win bonus ROA Members)

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Line Horse
Raptor Island
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
2 / 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    Pompei Warning       2    56.0    1    0.00     4.0   72    54           54    -18
2    Concerto             4    57.5    2    1.50     7.0   -     51           51    +51
3    Raptor Island        2    60.0    3    3.25     4.0   62    62           62    +0
4    Swiss Walt           4    60.0    4    4.50     7.0   73    56           63    -10
5    Sebastian's Angel    2    53.5    5    9.00     4.0   60    49           50    -10
6    Double Decker        3    60.0    6    11.25    6.0   -     58           58    +58
7    The Business         2    60.0    7    12.75    4.0   60    62           62    +2
8    Goosebumps           2    60.0    8    12.85    4.0   77    62           67    -10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Pompei Warning 72 75 54 +21 4.0 -
2 Concerto - 73 51 +22 7.0 -
3 Raptor Island Line 62 61 62 -1 4.0
4 Swiss Walt 73 74 63 +11 7.0 -
5 Sebastian's Angel 60 52 50 +2 4.0 -
6 Double Decker - - 58 -58 6.0 -
7 The Business 60 58 62 -4 4.0 -
8 Goosebumps 77 75 67 +8 4.0 -
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