Official NHA Assessment

Race 3: GUINEAS DAY 7 FEBRUARY PROGRESS PLATE (1,2 & 3 time winners & Maidens)

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Line Horse
Bristol Hercules
Reference for assessment
Exact Matches
1 / 6
Calculated = Official
Close Matches
1 / 6
Within 2 points
Significant Diffs
4 / 6
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    Taegan's Champ       3    60.5    1    0.00     6.0   103   82           78    -25
2    Hotarubi             4    54.5    2    1.75     3.0   101   79           91    -10
3    Bristol Hercules     2    57.0    3    4.50     0.0   87    87           87    +0
4    Step Into It         2    53.0    4    11.25    0.0   83    79           79    -4
99   My Lucky Charm       3    51.5    99   0.00     6.0   -     64           64    +0
99   Zanthar              3    55.0    99   0.00     6.0   -     71           71    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Taegan's Champ 103 103 78 +25 6.0 -
2 Hotarubi 101 98 91 +7 3.0 -
3 Bristol Hercules Line 87 87 87 ✓ Match 0.0
4 Step Into It 83 76 79 -3 0.0 -
99 My Lucky Charm - 73 64 +9 6.0 -
99 Zanthar - 80 71 +9 6.0 -
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