Official NHA Assessment

Race 6: ZIMBABWE CHALLENGE (Open)

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Line Horse
Wantage
Reference for assessment
Exact Matches
0 / 4
Calculated = Official
Close Matches
0 / 4
Within 2 points
Significant Diffs
4 / 4
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    Brianna              4    57.0    1    0.00     2.5   104   85           85    -19
2    Tradition            4    54.0    2    1.00     2.5   84    83           83    -1
3    Wantage              8    56.0    3    1.25     0.0   92    92           92    +0
4    Jet Mirage           3    60.0    4    2.75     5.0   100   88           90    -10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Brianna 104 103 85 +18 2.5 -
2 Tradition 84 77 83 -6 2.5 -
3 Wantage Line 92 78 92 -14 0.0
4 Jet Mirage 100 100 90 +10 5.0 -
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