Official NHA Assessment

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

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Line Horse
Stay The Course
Reference for assessment
Exact Matches
0 / 12
Calculated = Official
Close Matches
0 / 12
Within 2 points
Significant Diffs
9 / 12
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    Stay The Course      4    60.0    1    0.00     2.0   64    64           64    +0
2    Dawn Raider          4    60.0    2    1.50     2.0   49    67           67    +18
3    Jack's Jamboree      3    60.0    3    1.55     3.0   58    65           65    +7
4    Irish Sea            3    60.0    4    5.30     3.0   60    62           62    +2
5    King Of Luv          4    57.5    5    8.80     2.0   -     59           59    +59
6    Psychedelic Eric     3    60.0    6    10.05    3.0   57    62           62    +5
7    Freezing Fast        5    60.0    7    15.30    0.0   56    68           68    +12
8    Grace Lightning      3    57.5    8    16.05    3.0   64    57           57    -7
9    Libertarian          4    57.5    9    18.30    2.0   30    59           59    +29
10   Crystal City         3    60.0    10   28.05    3.0   64    62           62    -2
11   Captain Red Ray      3    60.0    11   37.05    3.0   51    62           62    +11
99   Twice The Dice       3    60.0    99   0.00     3.0   -     62           62    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Stay The Course Line 64 67 64 +3 2.0
2 Dawn Raider 49 53 67 -14 2.0 -
3 Jack's Jamboree 58 55 65 -10 3.0 -
4 Irish Sea 60 52 62 -10 3.0 -
5 King Of Luv - 48 59 -11 2.0 -
6 Psychedelic Eric 57 50 62 -12 3.0 -
7 Freezing Fast 56 44 68 -24 0.0 -
8 Grace Lightning 64 60 57 +3 3.0 -
9 Libertarian 30 27 59 -32 2.0 -
10 Crystal City 64 59 62 -3 3.0 -
11 Captain Red Ray 51 45 62 -17 3.0 -
99 Twice The Dice - 20 62 -42 3.0 -
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