Official NHA Assessment

Race 1: WELCOME TO NELSON MANDELA BAY RACING MAIDEN PLATE (For all Maidens)

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Line Horse
Knave Of Diamonds
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
0 / 8
Within 2 points
Significant Diffs
8 / 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    Knave Of Diamonds    3    60.0    1    0.00     3.0   68    68           68    +0
2    Captains Walk        3    60.0    2    1.75     3.0   59    68           68    +9
3    Dawn Raider          4    60.0    3    3.00     3.5   58    67           67    +9
4    Trumps Express       4    60.0    4    3.50     3.5   59    67           67    +8
5    Jack's Jamboree      3    60.0    5    6.25     3.0   64    68           68    +4
6    Itsa Kinda           3    60.0    6    9.50     3.0   47    68           68    +21
7    Horace Silver        3    60.0    7    19.00    3.0   -     68           68    +68
8    March Of The Lion    4    60.0    8    23.00    3.5   -     67           67    +67
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Knave Of Diamonds Line 68 57 68 -11 3.0
2 Captains Walk 59 54 68 -14 3.0 -
3 Dawn Raider 58 53 67 -14 3.5 -
4 Trumps Express 59 55 67 -12 3.5 -
5 Jack's Jamboree 64 55 68 -13 3.0 -
6 Itsa Kinda 47 47 68 -21 3.0 -
7 Horace Silver - 42 68 -26 3.0 -
8 March Of The Lion - 20 67 -47 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