Official NHA Assessment

Race 3: WWW.HIGHVELDRACING.CO.ZA MAIDEN PLATE (For all Maidens)

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Line Horse
Big Five
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
6 / 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    Johnny Dogs          2    56.0    1    0.00     0.0   -     50           6     +6
2    Big Five             3    60.0    2    2.00     0.5   60    60           60    +0
3    That's A Fact        3    60.0    3    4.00     0.5   43    58           58    +15
4    Never To Clever      4    60.0    4    4.75     0.5   56    57           57    +1
5    Bye Bye Birdie       3    60.0    5    10.25    0.5   -     57           57    +57
6    Kentallen Bay        2    56.0    6    12.50    0.0   -     50           50    +50
7    Dame Twining         2    53.0    7    15.75    0.0   -     44           44    +44
8    Thai Treat           3    60.0    8    20.75    0.5   53    57           57    +4
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Johnny Dogs - 67 6 +61 0.0 -
2 Big Five Line 60 53 60 -7 0.5
3 That's A Fact 43 53 58 -5 0.5 -
4 Never To Clever 56 64 57 +7 0.5 -
5 Bye Bye Birdie - 57 57 ✓ Match 0.5 -
6 Kentallen Bay - 90 50 +40 0.0 -
7 Dame Twining - 72 44 +28 0.0 -
8 Thai Treat 53 49 57 -8 0.5 -
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