Official NHA Assessment

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

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Line Horse
Pair Of Aces
Reference for assessment
Exact Matches
0 / 6
Calculated = Official
Close Matches
2 / 6
Within 2 points
Significant Diffs
3 / 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    Buster Barnes        2    58.0    1    0.00     0.0   86    52           52    -34
2    Follow The Band      2    58.0    2    10.00    0.0   56    52           52    -4
3    Pair Of Aces         4    58.0    3    17.00    1.0   50    50           50    +0
4    Emma Of Normandy     2    54.5    4    99.00    0.0   40    45           45    +5
5    Jumped A Red         2    54.5    5    99.00    0.0   36    45           45    +9
6    Simon's World        3    58.0    6    99.00    3.5   -     45           45    +45
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Buster Barnes 86 101 52 +49 0.0 -
2 Follow The Band 56 53 52 +1 0.0 -
3 Pair Of Aces Line 50 39 50 -11 1.0
4 Emma Of Normandy 40 44 45 -1 0.0 -
5 Jumped A Red 36 42 45 -3 0.0 -
6 Simon's World - - 45 -45 3.5 -
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