Official NHA Assessment

Race 2: AIR ZIMBABWE MERIT RATED 75 HANDICAP (Open)

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Line Horse
Duchess Of War
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
4 / 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    Karvani              7    53.5    1    0.00     0.0   62    60           62    +0
2    Bello Grosso         2    58.5    2    2.10     0.0   72    73           73    +1
3    Duchess Of War       2    52.0    3    3.10     0.0   59    59           59    +0
4    Bruce's Spirit       6    54.5    4    3.50     0.0   64    63           63    -1
5    Walking Thru Time    3    59.0    5    5.00     1.0   73    69           69    -4
6    Follow The Band      2    52.0    6    6.75     0.0   55    57           57    +2
7    Gypsy Express        5    56.0    7    9.00     0.0   67    65           65    -2
8    Battle Of Seattle    2    60.0    8    9.30     0.0   75    73           73    -2
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Karvani 62 73 62 +11 0.0 -
2 Bello Grosso 72 72 73 -1 0.0 -
3 Duchess Of War Line 59 55 59 -4 0.0
4 Bruce's Spirit 64 55 63 -8 0.0 -
5 Walking Thru Time 73 73 69 +4 1.0 -
6 Follow The Band 55 53 57 -4 0.0 -
7 Gypsy Express 67 58 65 -7 0.0 -
8 Battle Of Seattle 75 59 73 -14 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