Official NHA Assessment

Race 7: THE CLAPHAM STAKES (For F&M with a nett rating of 96 & below (Non-Black Type))

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Line Horse
Fun Zone
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
0 / 9
Within 2 points
Significant Diffs
5 / 9
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    Callmegetrix         4    60.0    1    0.00     2.0   89    82           82    -7
2    Goodnessgraciousme   2    55.5    2    0.10     0.0   88    77           78    -10
3    My Flower Fate       3    58.5    3    1.85     4.0   86    78           78    -8
4    Fun Zone             5    58.5    4    2.25     0.0   86    86           86    +0
5    Oni San              2    57.0    5    3.25     0.0   83    82           82    -1
6    Polynomial           3    57.0    6    5.75     4.0   92    72           82    -10
7    Hampstead Heath      4    58.5    7    6.15     2.0   85    79           79    -6
8    Dixieland Band       2    58.5    8    7.15     0.0   94    83           84    -10
9    School Policy        2    58.5    9    10.15    0.0   85    83           83    -2
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Callmegetrix 89 113 82 +31 2.0 -
2 Goodnessgraciousme 88 86 78 +8 0.0 -
3 My Flower Fate 86 86 78 +8 4.0 -
4 Fun Zone Line 86 96 86 +10 0.0
5 Oni San 83 78 82 -4 0.0 -
6 Polynomial 92 79 82 -3 4.0 -
7 Hampstead Heath 85 75 79 -4 2.0 -
8 Dixieland Band 94 72 84 -12 0.0 -
9 School Policy 85 79 83 -4 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