Official NHA Assessment

Race 5: SA DERBY 4 APRIL PINNACLE STAKES (Open)

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Line Horse
Elegant Ice
Reference for assessment
Exact Matches
1 / 7
Calculated = Official
Close Matches
2 / 7
Within 2 points
Significant Diffs
3 / 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    Taxi To The Moon     3    56.0    1    0.00     4.5   113   117          117   +4
2    Little Ballerina     2    50.0    2    0.40     3.0   104   108          108   +4
3    Elegant Ice          4    52.0    3    0.80     5.0   108   108          108   +0
4    Mount Pinatubo       2    56.0    4    1.90     3.0   110   120          120   +10
5    Ziyasha              2    58.0    5    2.50     3.0   117   124          124   +7
6    William Robertson    6    62.0    6    6.75     0.0   124   138          138   +14
99   Cosmic Star          3    52.5    99   0.00     4.5   -     110          110   +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Taxi To The Moon 113 119 117 +2 4.5 -
2 Little Ballerina 104 104 108 -4 3.0 -
3 Elegant Ice Line 108 108 108 ✓ Match 5.0
4 Mount Pinatubo 110 109 120 -11 3.0 -
5 Ziyasha 117 118 124 -6 3.0 -
6 William Robertson 124 124 138 -14 0.0 -
99 Cosmic Star - 105 110 -5 4.5 -
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