Official NHA Assessment

Race 4: JOHNNIE WALKER MR 68 HANDICAP (Open)

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Line Horse
Aquila Gold
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
3 / 8
Within 2 points
Significant Diffs
4 / 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    Eyjafjallajokull     2    61.5    1    0.00     0.5   71    75           71    +0
2    Ravilious            3    61.0    2    1.00     1.5   85    72           75    -10
3    William The First    2    61.5    3    1.10     0.5   71    75           75    +4
4    Aquila Gold          4    59.5    4    1.85     2.0   68    68           68    +0
5    Bytheliteofthemoon   4    59.5    5    2.35     2.0   68    68           68    +0
6    Duke Of Orange       3    50.0    6    2.60     1.5   56    50           50    -6
7    Back To Basics       3    60.5    7    3.85     1.5   72    71           71    -1
99   Absolu Noir          8    52.5    99   0.00     0.0   -     58           58    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Eyjafjallajokull 71 86 71 +15 0.5 -
2 Ravilious 85 81 75 +6 1.5 -
3 William The First 71 75 75 ✓ Match 0.5 -
4 Aquila Gold Line 68 56 68 -12 2.0
5 Bytheliteofthemoon 68 70 68 +2 2.0 -
6 Duke Of Orange 56 53 50 +3 1.5 -
7 Back To Basics 72 72 71 +1 1.5 -
99 Absolu Noir - 50 58 -8 0.0 -
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