Official NHA Assessment

Race 5: 4RACING.TV MR 76 HANDICAP (Open)

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Line Horse
Clarkson
Reference for assessment
Exact Matches
1 / 17
Calculated = Official
Close Matches
2 / 17
Within 2 points
Significant Diffs
9 / 17
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    Rule Book            6    53.0    1    0.00     0.0   71    62           71    +0
2    Royal Mazarin        4    55.0    2    0.10     2.0   67    62           62    -5
3    Pottinger            3    54.5    3    1.40     5.5   74    59           64    -10
4    Clarkson             4    56.5    4    1.70     2.0   70    70           70    +0
5    Arlington Action     6    55.0    5    2.40     0.0   75    70           70    -5
6    Apollo Robbins       5    57.0    6    2.70     0.0   73    74           74    +1
7    Flying Grace         4    59.5    7    3.30     2.0   76    73           73    -3
8    The Sash             6    52.0    8    3.35     0.0   57    62           62    +5
9    Atomic Blonde        5    52.5    9    3.40     0.0   61    63           63    +2
10   Attentive            5    53.0    10   3.90     0.0   62    64           64    +2
11   Cap Estel            3    55.5    11   4.10     5.5   75    58           65    -10
12   Imperious Light      3    55.0    12   5.80     5.5   74    55           64    -10
13   Sophia's First       5    52.5    13   9.00     0.0   61    61           61    +0
14   So Long Spring       7    52.0    14   10.25    0.0   60    60           60    +0
15   Ushuaia              4    59.0    15   27.75    2.0   75    70           70    -5
99   Kurt's Approval      7    52.0    99   0.00     0.0   -     60           60    +0
99   Mystery Boy          4    61.5    99   0.00     2.0   -     75           75    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Rule Book 71 92 71 +21 0.0 -
2 Royal Mazarin 67 70 62 +8 2.0 -
3 Pottinger 74 70 64 +6 5.5 -
4 Clarkson Line 70 75 70 +5 2.0
5 Arlington Action 75 73 70 +3 0.0 -
6 Apollo Robbins 73 69 74 -5 0.0 -
7 Flying Grace 76 63 73 -10 2.0 -
8 The Sash 57 55 62 -7 0.0 -
9 Atomic Blonde 61 68 63 +5 0.0 -
10 Attentive 62 58 64 -6 0.0 -
11 Cap Estel 75 71 65 +6 5.5 -
12 Imperious Light 74 55 64 -9 5.5 -
13 Sophia's First 61 57 61 -4 0.0 -
14 So Long Spring 60 51 60 -9 0.0 -
15 Ushuaia 75 72 70 +2 2.0 -
99 Kurt's Approval - 60 60 ✓ Match 0.0 -
99 Mystery Boy - 80 75 +5 2.0 -
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