Official NHA Assessment

Race 4: THE KINGS CLUB MAIDEN PLATE (For all Maidens)

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Line Horse
Naushon
Reference for assessment
Exact Matches
1 / 12
Calculated = Official
Close Matches
3 / 12
Within 2 points
Significant Diffs
4 / 12
More than 5 points
Detailed Assessment
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Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
------------------------------------------------------------------------------------------------------------------------
1    Diamond Rock         4    57.0    1    0.00     6.0   82    63           63    -19
2    Naushon              3    60.0    2    2.25     8.5   67    67           67    +0
3    Avignon              4    57.0    3    3.75     6.0   83    64           73    -10
4    Greenland            2    57.0    4    4.05     0.0   82    76           76    -6
5    Fairfield            2    54.0    5    4.55     0.0   -     69           69    +69
6    Makhachev            2    57.0    6    4.95     0.0   82    75           75    -7
7    Bella's Pablo        3    57.0    7    5.70     8.5   -     58           58    +58
8    Final Edition        5    60.0    8    7.95     0.0   69    81           81    +12
9    Jovial               2    57.0    9    8.25     0.0   -     75           75    +75
10   Gold Jet             3    54.0    10   20.00    8.5   -     52           52    +52
11   La Chanelle          3    54.0    11   20.30    8.5   -     52           52    +52
99   Apache Chief         4    57.0    99   0.00     6.0   -     63           63    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Diamond Rock 82 78 63 +15 6.0 -
2 Naushon Line 67 68 67 +1 8.5
3 Avignon 83 61 73 -12 6.0 -
4 Greenland 82 71 76 -5 0.0 -
5 Fairfield - 69 69 ✓ Match 0.0 -
6 Makhachev 82 81 75 +6 0.0 -
7 Bella's Pablo - 61 58 +3 8.5 -
8 Final Edition 69 78 81 -3 0.0 -
9 Jovial - 70 75 -5 0.0 -
10 Gold Jet - 51 52 -1 8.5 -
11 La Chanelle - 56 52 +4 8.5 -
99 Apache Chief - 74 63 +11 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