Official NHA Assessment

Race 6: MERIT RATED 75 HANDICAP (Open)

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Line Horse
Midfield Girl
Reference for assessment
Exact Matches
0 / 6
Calculated = Official
Close Matches
0 / 6
Within 2 points
Significant Diffs
4 / 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    Obscure              4    60.0    1    0.00     1.0   72    83           72    +0
2    Midfield Girl        3    52.0    2    6.00     3.5   62    62           62    +0
3    At The Office        6    56.5    3    7.25     0.0   65    78           78    +13
4    Viscountess Vivien   6    56.0    4    9.75     0.0   64    77           77    +13
5    Apache Gold          3    52.0    5    11.75    3.5   53    62           62    +9
99   Magnus Maximus       4    59.5    99   0.00     1.0   -     82           82    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Obscure 72 87 72 +15 1.0 -
2 Midfield Girl Line 62 59 62 -3 3.5
3 At The Office 65 45 78 -33 0.0 -
4 Viscountess Vivien 64 72 77 -5 0.0 -
5 Apache Gold 53 52 62 -10 3.5 -
99 Magnus Maximus - 71 82 -11 1.0 -
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