Official NHA Assessment

Race 7: NELSON MANDELA BAY RACING POLY CHALLENGE 1200 (Open - Leg 1 EC Poly Challenge (Non-Blk Type))

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Line Horse
Slim Jannie
Reference for assessment
Exact Matches
0 / 13
Calculated = Official
Close Matches
1 / 13
Within 2 points
Significant Diffs
9 / 13
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    King Regent          3    62.0    1    0.00     10.5  112   95           95    -17
2    Ledell's Echo        2    59.5    2    3.25     7.0   93    97           97    +4
3    Slim Jannie          2    61.0    3    4.50     7.0   100   100          100   +0
4    Prince Of Fire       3    62.0    4    5.00     10.5  106   95           96    -10
5    Teatro               5    59.5    5    6.25     0.0   96    111          111   +15
6    Passchendaele        4    58.5    6    7.00     12.0  97    85           87    -10
7    Narcos               3    58.0    7    7.10     10.5  87    87           87    +0
8    Slings And Arrows    3    58.0    8    8.35     10.5  91    87           87    -4
9    Inherit The Rain     4    61.0    9    8.45     12.0  100   90           90    -10
10   Miss Greenlight      3    58.5    10   8.55     10.5  101   88           91    -10
11   Funky Music          4    59.5    11   9.05     12.0  92    87           87    -5
12   Perfection           3    62.0    12   9.30     10.5  103   95           95    -8
13   Barzalona            6    58.0    13   22.55    0.0   91    108          108   +17
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 King Regent 112 106 95 +11 10.5 -
2 Ledell's Echo 93 88 97 -9 7.0 -
3 Slim Jannie Line 100 95 100 -5 7.0
4 Prince Of Fire 106 104 96 +8 10.5 -
5 Teatro 96 91 111 -20 0.0 -
6 Passchendaele 97 104 87 +17 12.0 -
7 Narcos 87 86 87 -1 10.5 -
8 Slings And Arrows 91 92 87 +5 10.5 -
9 Inherit The Rain 100 98 90 +8 12.0 -
10 Miss Greenlight 101 100 91 +9 10.5 -
11 Funky Music 92 83 87 -4 12.0 -
12 Perfection 103 103 95 +8 10.5 -
13 Barzalona 91 66 108 -42 0.0 -
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