Official NHA Assessment

Race 5: SA DERBY 4 APRIL MR 104 HANDICAP (Open)

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Line Horse
Karate Kid
Reference for assessment
Exact Matches
1 / 11
Calculated = Official
Close Matches
5 / 11
Within 2 points
Significant Diffs
4 / 11
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    Mover And Shaker     5    58.0    1    0.00     0.0   105   110          105   +0
2    Night Bomber         4    56.0    2    1.40     6.0   96    94           94    -2
3    Karate Kid           3    59.5    3    1.65     5.0   103   103          103   +0
4    Rafa Bay             2    48.5    4    1.85     3.5   89    84           84    -5
5    Magic Tattoo         5    56.0    5    2.35     0.0   96    106          106   +10
6    Miami Mountain       3    53.5    6    2.65     5.0   98    91           91    -7
7    Gimmethegoodlife     3    57.0    7    4.90     5.0   98    98           98    +0
8    African Pride        2    56.5    8    5.00     3.5   104   100          100   -4
9    Dontshootthebarman   5    50.5    9    5.20     0.0   93    95           95    +2
10   Cosmic Star          3    61.0    10   5.50     5.0   106   106          106   +0
11   Sheldon              6    61.0    11   9.25     0.0   106   116          116   +10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Mover And Shaker 105 109 105 +4 0.0 -
2 Night Bomber 96 96 94 +2 6.0 -
3 Karate Kid Line 103 103 103 ✓ Match 5.0
4 Rafa Bay 89 96 84 +12 3.5 -
5 Magic Tattoo 96 93 106 -13 0.0 -
6 Miami Mountain 98 103 91 +12 5.0 -
7 Gimmethegoodlife 98 96 98 -2 5.0 -
8 African Pride 104 103 100 +3 3.5 -
9 Dontshootthebarman 93 93 95 -2 0.0 -
10 Cosmic Star 106 105 106 -1 5.0 -
11 Sheldon 106 106 116 -10 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