Official NHA Assessment

Race 7: play.tabonline.co.za CLASS 4 (Open. Benchmark at 60.0kg = 78)

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Line Horse
Coronation Time
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
4 / 8
Within 2 points
Significant Diffs
3 / 8
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    Keep Shining         3    52.0    1    0.00     2.5   62    55           55    -7
2    Coronation Time      2    59.0    2    0.50     0.0   81    81           81    +0
3    Mister Monocle       4    59.5    3    2.00     1.0   77    78           78    +1
4    Donder Storm         3    53.0    4    2.20     2.5   63    62           62    -1
5    Big Poppa            3    53.5    5    3.20     2.5   70    61           61    -9
6    Twice The Master     3    52.0    6    3.70     2.5   61    58           58    -3
7    Silver Sky           6    58.5    7    4.45     0.0   75    74           74    -1
99   Thunder Master       6    61.0    99   0.00     0.0   -     78           78    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Keep Shining 62 64 55 +9 2.5 -
2 Coronation Time Line 81 80 81 -1 0.0
3 Mister Monocle 77 71 78 -7 1.0 -
4 Donder Storm 63 63 62 +1 2.5 -
5 Big Poppa 70 52 61 -9 2.5 -
6 Twice The Master 61 58 58 ✓ Match 2.5 -
7 Silver Sky 75 70 74 -4 0.0 -
99 Thunder Master - 80 78 +2 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