Official NHA Assessment

Race 3: play.tabonline.co.za CLASS 4 (Open. Benchmark at 60.0kg = 78)

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Line Horse
Willie John
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
0 / 10
Within 2 points
Significant Diffs
10 / 10
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    The Grey King        4    58.0    1    0.00     3.0   84    85           85    +1
2    Augusta Blue         5    59.0    2    0.75     0.0   75    97           97    +22
3    Heart Stealer        5    58.0    3    1.15     0.0   74    95           95    +21
4    Willie John          3    61.0    4    1.45     5.0   90    90           90    +0
5    Dragonfly            3    60.5    5    1.95     5.0   79    89           89    +10
6    Porto Zante          2    57.5    6    2.70     0.0   83    92           92    +9
7    Bright Blue Sky      2    60.0    7    4.45     0.0   78    95           95    +17
8    Kebonalesedi         5    57.5    8    5.45     0.0   73    90           90    +17
9    Strathclyde          3    59.5    9    10.20    5.0   87    84           84    -3
99   Nordic Chief         4    57.0    99   0.00     3.0   -     83           83    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 The Grey King 84 98 85 +13 3.0 -
2 Augusta Blue 75 69 97 -28 0.0 -
3 Heart Stealer 74 80 95 -15 0.0 -
4 Willie John Line 90 84 90 -6 5.0
5 Dragonfly 79 71 89 -18 5.0 -
6 Porto Zante 83 64 92 -28 0.0 -
7 Bright Blue Sky 78 76 95 -19 0.0 -
8 Kebonalesedi 73 67 90 -23 0.0 -
9 Strathclyde 87 97 84 +13 5.0 -
99 Nordic Chief - 94 83 +11 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