Official NHA Assessment

Race 4: EARL OF SURREY MERIT RATED 80 HANDICAP (Open)

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Line Horse
Admirals Chance
Reference for assessment
Exact Matches
0 / 6
Calculated = Official
Close Matches
0 / 6
Within 2 points
Significant Diffs
5 / 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    Kallipos             3    56.0    1    0.00     5.0   72    62           72    +0
2    Admirals Chance      5    62.0    2    0.10     0.0   84    84           84    +0
3    Red Top              5    57.0    3    3.10     0.0   74    76           76    +2
4    Battle Of Seattle    2    56.5    4    3.15     0.0   73    75           75    +2
5    Nandine              3    58.0    5    5.15     5.0   76    66           66    -10
99   Tradition            4    59.5    99   0.00     3.0   -     73           73    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Kallipos 72 63 72 -9 5.0 -
2 Admirals Chance Line 84 77 84 -7 0.0
3 Red Top 74 70 76 -6 0.0 -
4 Battle Of Seattle 73 59 75 -16 0.0 -
5 Nandine 76 60 66 -6 5.0 -
99 Tradition - 77 73 +4 3.0 -
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