Official NHA Assessment

Race 4: EARL OF SURREY SUPERIOR PLATE (Open)

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Line Horse
Hildelita
Reference for assessment
Exact Matches
0 / 4
Calculated = Official
Close Matches
0 / 4
Within 2 points
Significant Diffs
3 / 4
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    Tom's Diner          4    57.5    1    0.00     1.0   83    91           89    +6
2    Hildelita            4    55.0    2    5.00     1.0   86    86           86    +0
3    Ultimate Jewel       5    60.0    3    9.00     0.0   87    98           98    +11
4    Admirals Chance      5    60.0    4    12.00    0.0   88    98           98    +10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Tom's Diner 83 94 89 +5 1.0 -
2 Hildelita Line 86 76 86 -10 1.0
3 Ultimate Jewel 87 80 98 -18 0.0 -
4 Admirals Chance 88 77 98 -21 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