Official NHA Assessment

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Line Horse
Like A Butterfly
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
1 / 11
Within 2 points
Significant Diffs
10 / 11
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    Apache Son           4    60.0    1    0.00     0.5   62    70           68    +6
2    Scars Of War         2    53.5    2    0.05     0.0   -     58           58    +58
3    Strewn Sky           2    60.0    3    0.65     0.0   73    76           76    +3
4    Like A Butterfly     3    57.0    4    3.55     2.0   62    62           62    +0
5    Erimitage            4    60.0    5    6.30     0.5   75    70           70    -5
6    Gimmeachoice         3    60.0    6    6.90     2.0   -     67           67    +67
7    Breath Of Magic      4    60.0    7    7.65     0.5   70    70           70    +0
8    Roll Of The Dice     3    60.0    8    8.85     2.0   68    67           67    -1
9    Sicily               2    56.0    9    13.60    0.0   -     63           63    +63
10   American Spirit      3    60.0    10   20.85    2.0   -     67           67    +67
11   Captain Barbosa      3    60.0    11   22.00    2.0   58    67           67    +9
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Apache Son 62 89 68 +21 0.5 -
2 Scars Of War - 94 58 +36 0.0 -
3 Strewn Sky 73 69 76 -7 0.0 -
4 Like A Butterfly Line 62 54 62 -8 2.0
5 Erimitage 75 62 70 -8 0.5 -
6 Gimmeachoice - 87 67 +20 2.0 -
7 Breath Of Magic 70 60 70 -10 0.5 -
8 Roll Of The Dice 68 81 67 +14 2.0 -
9 Sicily - 62 63 -1 0.0 -
10 American Spirit - 48 67 -19 2.0 -
11 Captain Barbosa 58 52 67 -15 2.0 -
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