Official NHA Assessment

Race 7: DUNCAN HOWELLS RACING STABLES APPRENTICE CLASS 5 (Open. Benchmark at 60.0kg = 66)

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Line Horse
Double Olympic
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
0 / 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    Dawn Surprise        4    54.5    1    0.00     11.0  60    55           55    -5
2    Double Olympic       4    55.0    2    0.05     11.0  56    56           56    +0
3    Boardwalk Breeze     2    57.5    3    1.25     6.5   82    70           72    -10
4    Golden Aspen         6    58.0    4    9.15     0.0   65    84           84    +19
5    Rhythm               2    58.5    5    9.20     6.5   71    72           72    +1
6    William West         2    55.0    6    11.90    6.5   64    65           65    +1
7    Time In Paris        4    52.0    7    12.70    11.0  55    50           50    -5
8    Lightning Jimmy      4    48.0    8    15.50    11.0  50    42           42    -8
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Dawn Surprise 60 79 55 +24 11.0 -
2 Double Olympic Line 56 53 56 -3 11.0
3 Boardwalk Breeze 82 80 72 +8 6.5 -
4 Golden Aspen 65 66 84 -18 0.0 -
5 Rhythm 71 67 72 -5 6.5 -
6 William West 64 51 65 -14 6.5 -
7 Time In Paris 55 61 50 +11 11.0 -
8 Lightning Jimmy 50 48 42 +6 11.0 -
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