Official NHA Assessment

Race 4: www.tabgold.co.za QUALIFIED MAIDEN PLATE (Maidens with 3 runs or more & gross rating of 68 or less)

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Line Horse
Double Silver
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
2 / 8
Within 2 points
Significant Diffs
6 / 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    Royal Point          2    58.0    1    0.00     0.0   68    78           74    +6
2    Ultimate Jewel       5    58.0    2    1.50     0.0   58    81           81    +23
3    Double Silver        3    58.0    3    2.90     6.0   68    68           68    +0
4    Raptor Island        2    58.0    4    5.00     0.0   58    78           78    +20
5    Ndabezitha           2    54.0    5    7.50     0.0   61    70           70    +9
6    Sewelo               3    58.5    6    8.10     6.0   48    67           67    +19
7    Grand Finale         2    58.0    7    8.70     0.0   55    78           78    +23
99   Mccartney            3    60.0    99   0.00     6.0   -     70           70    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Royal Point 68 75 74 +1 0.0 -
2 Ultimate Jewel 58 80 81 -1 0.0 -
3 Double Silver Line 68 74 68 +6 6.0
4 Raptor Island 58 61 78 -17 0.0 -
5 Ndabezitha 61 59 70 -11 0.0 -
6 Sewelo 48 45 67 -22 6.0 -
7 Grand Finale 55 62 78 -16 0.0 -
99 Mccartney - 54 70 -16 6.0 -
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