Official NHA Assessment

Race 6: TAB EMPRESS CLUB STAKES (Grade 1) (For Fillies and Mares at Weight-for-Age)

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Line Horse
Humdinger
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    Gimme A Nother       3    57.5    1    0.00     2.5   125   108          108   -17
2    Humdinger            3    60.0    2    1.50     2.5   116   116          116   +0
3    Mrs Geriatrix        2    57.5    3    5.00     0.0   115   113          113   -2
4    Gilded Butterfly     3    60.0    4    6.25     2.5   109   113          113   +4
5    Perfect Witness      3    60.0    5    7.35     2.5   105   113          113   +8
6    Bavarian Beauty      2    57.5    6    12.25    0.0   113   113          113   +0
7    Emirate Gina         2    60.0    7    29.25    0.0   105   118          118   +13
99   Lady Of Power        2    60.0    99   0.00     0.0   -     118          118   +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Gimme A Nother 125 125 108 +17 2.5 -
2 Humdinger Line 116 119 116 +3 2.5
3 Mrs Geriatrix 115 112 113 -1 0.0 -
4 Gilded Butterfly 109 108 113 -5 2.5 -
5 Perfect Witness 105 105 113 -8 2.5 -
6 Bavarian Beauty 113 109 113 -4 0.0 -
7 Emirate Gina 105 103 118 -15 0.0 -
99 Lady Of Power - 100 118 -18 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