Official NHA Assessment

Race 6: ZIMBABWE DERBY (GRADE 3) (For 3-year-olds/ 3rd Leg Triple Crown)

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Line Horse
Ultra Pursuit
Reference for assessment
Exact Matches
1 / 6
Calculated = Official
Close Matches
4 / 6
Within 2 points
Significant Diffs
2 / 6
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    Robin Of Locksley    3    58.0    1    0.00     4.5   75    74           74    -1
2    Ultra Pursuit        3    58.0    2    2.50     4.5   78    78           78    +0
3    Winchester           2    58.0    3    11.50    0.0   69    83           83    +14
4    Zambezi Sunset       2    58.0    4    14.00    0.0   60    83           83    +23
99   Diamond Jim          3    58.0    99   0.00     4.5   -     74           74    +0
99   Sally Port           2    55.5    99   0.00     0.0   -     78           78    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Robin Of Locksley 75 75 74 +1 4.5 -
2 Ultra Pursuit Line 78 78 78 ✓ Match 4.5
3 Winchester 69 69 83 -14 0.0 -
4 Zambezi Sunset 60 60 83 -23 0.0 -
99 Diamond Jim - 76 74 +2 4.5 -
99 Sally Port - 79 78 +1 0.0 -
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