Official NHA Assessment

Race 7: HOLLYWOODBETS DIANA STAKES (Grade 3) (Fillies and Mares at Weight For Age + Penalties)

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Line Horse
Santa Maria
Reference for assessment
Exact Matches
3 / 7
Calculated = Official
Close Matches
4 / 7
Within 2 points
Significant Diffs
2 / 7
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    Santa Maria          3    57.0    1    0.00     7.0   106   106          106   +0
2    Chansonette          3    60.0    2    0.50     7.0   123   117          117   -6
3    Going Up             3    57.0    3    0.90     7.0   98    110          110   +12
4    Kwinta's Light       3    57.0    4    1.90     7.0   102   109          109   +7
5    Veronica Mars        4    57.5    5    3.15     4.5   97    114          114   +17
6    Tipsy Tarragon       2    50.5    6    3.20     0.0   95    109          109   +14
7    Dancetildaylight     3    57.0    7    3.50     7.0   100   107          107   +7
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Santa Maria Line 106 106 106 ✓ Match 7.0
2 Chansonette 123 113 117 -4 7.0 -
3 Going Up 98 110 110 ✓ Match 7.0 -
4 Kwinta's Light 102 109 109 ✓ Match 7.0 -
5 Veronica Mars 97 92 114 -22 4.5 -
6 Tipsy Tarragon 95 108 109 -1 0.0 -
7 Dancetildaylight 100 92 107 -15 7.0 -
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