Official NHA Assessment

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Line Horse
Idabelle
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
6 / 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    Unyielding           2    60.0    1    0.00     0.0   62    67           67    +5
2    Idabelle             2    60.0    2    0.25     0.0   67    67           67    +0
3    Misava               3    60.0    3    4.50     2.5   60    62           62    +2
4    Miss Christmas       3    60.0    4    5.00     2.5   64    62           62    -2
5    Dame Colleen         3    60.0    5    10.80    2.5   54    62           62    +8
6    Double Joy           2    60.0    6    16.60    0.0   59    67           67    +8
7    Countess Danza       5    60.0    7    17.50    0.0   73    67           67    -6
99   Talk To My Lawyer    3    60.0    99   0.00     2.5   -     62           62    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Unyielding 62 88 67 +21 0.0 -
2 Idabelle Line 67 70 67 +3 0.0
3 Misava 60 53 62 -9 2.5 -
4 Miss Christmas 64 64 62 +2 2.5 -
5 Dame Colleen 54 46 62 -16 2.5 -
6 Double Joy 59 44 67 -23 0.0 -
7 Countess Danza 73 51 67 -16 0.0 -
99 Talk To My Lawyer - - 62 -62 2.5 -
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