Official NHA Assessment

Race 6: SWEET CHESTNUT STAKES (Listed) (For F&M 3-years & older)

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Line Horse
Roccapina
Reference for assessment
Exact Matches
2 / 8
Calculated = Official
Close Matches
5 / 8
Within 2 points
Significant Diffs
3 / 8
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    Queen Regent         2    53.5    1    0.00     0.0   94    94           94    +0
2    Roccapina            2    58.5    2    0.50     0.0   109   109          109   +0
3    Viva La Vida         2    53.5    3    2.25     0.0   92    97           97    +5
4    Stormwatch           2    56.0    4    2.75     0.0   109   101          101   -8
5    Give Me Everything   3    60.0    5    3.75     2.0   106   104          104   -2
6    Kinda Wonderful      2    60.0    6    3.95     0.0   108   108          108   +0
7    Scarlet Macaw        2    58.5    7    5.20     0.0   107   104          104   -3
8    Wild Applause        3    56.0    8    8.45     2.0   86    95           95    +9
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Queen Regent 94 103 94 +9 0.0 -
2 Roccapina Line 109 109 109 ✓ Match 0.0
3 Viva La Vida 92 98 97 +1 0.0 -
4 Stormwatch 109 108 101 +7 0.0 -
5 Give Me Everything 106 103 104 -1 2.0 -
6 Kinda Wonderful 108 108 108 ✓ Match 0.0 -
7 Scarlet Macaw 107 106 104 +2 0.0 -
8 Wild Applause 86 86 95 -9 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