Official NHA Assessment

Race 3: www.tabgold.co.za MAIDEN PLATE (F & M) (For Maiden Fillies and Mares)

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Line Horse
Natasha Rostov
Reference for assessment
Exact Matches
1 / 7
Calculated = Official
Close Matches
2 / 7
Within 2 points
Significant Diffs
3 / 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    Roy's T's            2    55.0    1    0.00     0.0   -     42           6     +6
2    Natasha Rostov       3    60.0    2    0.40     1.5   56    56           56    +0
3    Top Ten              4    56.0    3    0.45     0.5   45    50           50    +5
4    Mythical Tune        3    60.0    4    1.25     1.5   -     55           55    +55
5    View The Roses       3    60.0    5    4.05     1.5   54    51           51    -3
6    Sea Cruise           3    60.0    6    11.45    1.5   57    49           49    -8
7    Roy's Charmer        3    60.0    7    14.05    1.5   -     49           49    +49
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Roy's T's - 59 6 +53 0.0 -
2 Natasha Rostov Line 56 53 56 -3 1.5
3 Top Ten 45 50 50 ✓ Match 0.5 -
4 Mythical Tune - 50 55 -5 1.5 -
5 View The Roses 54 50 51 -1 1.5 -
6 Sea Cruise 57 58 49 +9 1.5 -
7 Roy's Charmer - 29 49 -20 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