Official NHA Assessment

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Line Horse
Purple Operator
Reference for assessment
Exact Matches
1 / 9
Calculated = Official
Close Matches
1 / 9
Within 2 points
Significant Diffs
7 / 9
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    Blackwhitedynamite   3    61.0    1    0.00     10.5  77    77           77    +0
2    Purple Operator      3    59.5    2    4.00     10.5  74    74           74    +0
3    Preemptive Strike    4    57.5    3    4.05     12.0  70    67           67    -3
4    Prosper's Gift       2    55.5    4    5.10     7.0   66    73           73    +7
5    High Velocity        4    54.5    5    5.15     12.0  64    61           61    -3
6    Saipan               5    52.0    6    6.35     0.0   54    80           80    +26
7    Roy's July Magic     4    52.5    7    7.15     12.0  60    57           57    -3
8    Brass Bell           8    58.0    8    8.35     0.0   71    92           92    +21
9    Grande Lupo          2    57.0    9    9.35     7.0   69    76           76    +7
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Blackwhitedynamite 77 86 77 +9 10.5 -
2 Purple Operator Line 74 74 74 ✓ Match 10.5
3 Preemptive Strike 70 70 67 +3 12.0 -
4 Prosper's Gift 66 64 73 -9 7.0 -
5 High Velocity 64 50 61 -11 12.0 -
6 Saipan 54 52 80 -28 0.0 -
7 Roy's July Magic 60 48 57 -9 12.0 -
8 Brass Bell 71 55 92 -37 0.0 -
9 Grande Lupo 69 62 76 -14 7.0 -
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