Official NHA Assessment

Race 4: www.tabgold.co.za MR 83 HANDICAP (Open)

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Line Horse
Straight Up
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
3 / 11
Within 2 points
Significant Diffs
7 / 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    Grimaldi             4    57.5    1    0.00     1.0   78    74           78    +0
2    Sea Master           4    58.5    2    0.90     1.0   80    80           80    +0
3    Straight Up          5    58.5    3    2.90     0.0   80    80           80    +0
4    Born To Perform      7    61.0    4    4.70     0.0   85    83           83    -2
5    Ibutho               7    59.0    5    4.85     0.0   81    79           79    -2
6    Attorney General     5    57.0    6    6.95     0.0   77    75           75    -2
7    Gavel Strike         4    61.0    7    9.15     1.0   85    81           81    -4
8    Lucky Dancer         6    61.5    8    32.15    0.0   86    84           84    -2
99   Gimmie A Star        3    60.5    99   0.00     2.5   -     77           77    +0
99   Twin Turbo           4    57.5    99   0.00     1.0   -     74           74    +0
99   Southern Cape        3    57.5    99   0.00     2.5   -     71           71    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Grimaldi 78 67 78 -11 1.0 -
2 Sea Master 80 99 80 +19 1.0 -
3 Straight Up Line 80 79 80 -1 0.0
4 Born To Perform 85 84 83 +1 0.0 -
5 Ibutho 81 83 79 +4 0.0 -
6 Attorney General 77 68 75 -7 0.0 -
7 Gavel Strike 85 71 81 -10 1.0 -
8 Lucky Dancer 86 83 84 -1 0.0 -
99 Gimmie A Star - 93 77 +16 2.5 -
99 Twin Turbo - 88 74 +14 1.0 -
99 Southern Cape - 96 71 +25 2.5 -
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