Official NHA Assessment

Race 6: play.tabonline.co.za CLASS 3 (F & M) (For Fillies & Mares. Benchmark at 60.0kg = 94)

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Line Horse
Spywing
Reference for assessment
Exact Matches
1 / 7
Calculated = Official
Close Matches
2 / 7
Within 2 points
Significant Diffs
4 / 7
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    Miss Marguerite      5    55.0    1    0.00     0.0   84    87           87    +3
2    Spywing              2    55.5    2    0.20     1.5   85    85           85    +0
3    Allende              3    54.5    3    0.95     2.5   83    81           81    -2
4    Queen Of Sparta      2    56.0    4    1.25     1.5   86    86           86    +0
5    Sonic Burst          4    59.0    5    2.25     0.0   89    95           95    +6
6    Butterfly Beauty     2    56.5    6    2.55     1.5   87    87           87    +0
7    Bonika               2    60.0    7    2.65     1.5   94    94           94    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Miss Marguerite 84 91 87 +4 0.0 -
2 Spywing Line 85 85 85 ✓ Match 1.5
3 Allende 83 71 81 -10 2.5 -
4 Queen Of Sparta 86 87 86 +1 1.5 -
5 Sonic Burst 89 81 95 -14 0.0 -
6 Butterfly Beauty 87 80 87 -7 1.5 -
7 Bonika 94 80 94 -14 1.5 -
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