Official NHA Assessment

Race 1: WELCOME TO NELSON MANDELA BAY CONDITIONAL MAIDEN (F & M) (Mdn F&M 3 runs or more nett 66 & below. R5 000 Win bonus ROA)

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Line Horse
Tartan Queen
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
3 / 8
Within 2 points
Significant Diffs
4 / 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    Best Intentions      2    60.0    1    0.00     6.5   60    72           66    +6
2    Royal Venus          2    57.0    2    4.25     6.5   49    66           66    +17
3    Tartan Queen         2    60.0    3    4.30     6.5   72    72           72    +0
4    Double Trade         2    59.0    4    4.40     6.5   70    70           70    +0
5    Tune Again           6    59.0    5    4.65     0.0   55    83           83    +28
6    Sierra Sky           3    57.0    6    6.40     9.5   50    60           60    +10
7    Natural Wonder       3    54.5    7    8.90     9.5   58    55           55    -3
99   Ponte Vecchio        2    60.0    99   0.00     6.5   -     72           72    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Best Intentions 60 67 66 +1 6.5 -
2 Royal Venus 49 50 66 -16 6.5 -
3 Tartan Queen Line 72 70 72 -2 6.5
4 Double Trade 70 67 70 -3 6.5 -
5 Tune Again 55 50 83 -33 0.0 -
6 Sierra Sky 50 45 60 -15 9.5 -
7 Natural Wonder 58 55 55 ✓ Match 9.5 -
99 Ponte Vecchio - 56 72 -16 6.5 -
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