Official NHA Assessment

Race 3: EARL OF SURREY ALLOWANCE PLATE (For winners)

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Line Horse
Coffeeberry
Reference for assessment
Exact Matches
0 / 5
Calculated = Official
Close Matches
2 / 5
Within 2 points
Significant Diffs
3 / 5
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    Aerial Display       5    57.5    1    0.00     0.0   72    70           70    -2
2    Walking Thru Time    3    55.0    2    0.25     3.5   70    58           60    -10
3    Coffeeberry          5    57.0    3    0.35     0.0   74    74           74    +0
4    Why Madera           2    60.0    4    12.35    0.0   89    75           79    -10
99   Zazu                 6    53.5    99   0.00     0.0   -     62           62    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Aerial Display 72 68 70 -2 0.0 -
2 Walking Thru Time 70 73 60 +13 3.5 -
3 Coffeeberry Line 74 72 74 -2 0.0
4 Why Madera 89 89 79 +10 0.0 -
99 Zazu - 71 62 +9 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