Official NHA Assessment

Race 6: ZIMBABWE GUINEAS (Grade 3) (For all 3 year olds/ 1st leg Triple Crown)

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Line Horse
Down To Business
Reference for assessment
Exact Matches
0 / 4
Calculated = Official
Close Matches
0 / 4
Within 2 points
Significant Diffs
3 / 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    Jacky Sparrow        3    55.5    1    0.00     3.0   75    75           75    +0
2    Down To Business     2    58.0    2    0.10     0.0   86    86           86    +0
99   Prince Of Kimberly   3    58.0    99   0.00     3.0   -     80           80    +0
99   Grand Warrior        2    58.0    99   0.00     0.0   -     86           86    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Jacky Sparrow 75 80 75 +5 3.0 -
2 Down To Business Line 86 100 86 +14 0.0
99 Prince Of Kimberly - 73 80 -7 3.0 -
99 Grand Warrior - 96 86 +10 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