Official NHA Assessment

Race 8: 4RACING GERALD ROSENBERG STAKES (Grade 2) (For Fillies and Mares at Weight for Age + Penalties)

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Line Horse
Perfect Witness
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
1 / 7
Within 2 points
Significant Diffs
5 / 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    Rain In Holland      3    58.5    1    0.00     3.5   118   107          107   -11
2    Perfect Witness      3    56.5    2    1.25     3.5   109   109          109   +0
3    Pink Tourmaline      4    60.0    3    1.30     1.5   101   119          119   +18
4    Opera Glass          4    60.0    4    1.80     1.5   91    119          119   +28
5    Sprinkles            3    56.5    5    4.90     3.5   110   103          103   -7
6    Tinder Dry           3    56.5    6    7.25     3.5   78    103          103   +25
7    Dindingwe            4    60.0    7    15.50    1.5   97    114          114   +17
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Rain In Holland 118 120 107 +13 3.5 -
2 Perfect Witness Line 109 105 109 -4 3.5
3 Pink Tourmaline 101 108 119 -11 1.5 -
4 Opera Glass 91 81 119 -38 1.5 -
5 Sprinkles 110 105 103 +2 3.5 -
6 Tinder Dry 78 66 103 -37 3.5 -
7 Dindingwe 97 95 114 -19 1.5 -
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