Official NHA Assessment

Race 5: MERIT RATED 69 HANDICAP (Open)

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Line Horse
Magic Vision
Reference for assessment
Exact Matches
2 / 7
Calculated = Official
Close Matches
4 / 7
Within 2 points
Significant Diffs
1 / 7
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    Viscountess Vivien   6    59.5    1    0.00     0.0   68    66           68    +0
2    Differentiate        5    60.0    2    2.00     0.0   69    70           70    +1
3    Magic Vision         5    57.5    3    2.75     0.0   64    64           64    +0
4    Windsor Lane (ZIM)   4    52.0    4    4.75     0.5   48    50           50    +2
5    Kursk (AUS)          6    60.0    5    4.80     0.0   69    67           67    -2
6    Justadoreher         5    58.0    6    8.30     0.0   65    63           63    -2
7    At The Office        6    55.5    7    10.05    0.0   60    58           58    -2
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Viscountess Vivien 68 72 68 +4 0.0 -
2 Differentiate 69 72 70 +2 0.0 -
3 Magic Vision Line 64 64 64 ✓ Match 0.0
4 Windsor Lane (ZIM) 48 49 50 -1 0.5 -
5 Kursk (AUS) 69 67 67 ✓ Match 0.0 -
6 Justadoreher 65 68 63 +5 0.0 -
7 At The Office 60 45 58 -13 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