Official NHA Assessment

Race 8: JEHAN MALHERBE SENOR SANTA STAKES (Grade 2) (Open)

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Line Horse
Surjay
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
1 / 11
Within 2 points
Significant Diffs
5 / 11
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    Lucky Lad            4    58.0    1    0.00     3.5   119   114          114   -5
2    I Am Giant           2    54.0    2    0.40     2.0   104   109          109   +5
3    Surjay               3    60.0    3    0.60     3.0   119   119          119   +0
4    Winter Greeting      5    53.5    4    1.00     0.0   108   112          112   +4
5    Unzen                3    56.0    5    2.25     3.0   109   111          111   +2
6    Rulership            2    60.0    6    2.50     2.0   119   121          121   +2
7    Moonshiningthrough   3    50.0    7    3.75     3.0   98    99           99    +1
8    Taikonaut            2    58.0    8    4.80     2.0   113   117          117   +4
9    Quantum Theory       5    58.0    9    5.00     0.0   114   121          121   +7
10   Captain Hindsight    5    56.0    10   6.25     0.0   111   117          117   +6
11   Swing Upon A Star    2    54.0    11   7.50     2.0   105   109          109   +4
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Lucky Lad 119 118 114 +4 3.5 -
2 I Am Giant 104 124 109 +15 2.0 -
3 Surjay Line 119 121 119 +2 3.0
4 Winter Greeting 108 104 112 -8 0.0 -
5 Unzen 109 116 111 +5 3.0 -
6 Rulership 119 118 121 -3 2.0 -
7 Moonshiningthrough 98 96 99 -3 3.0 -
8 Taikonaut 113 104 117 -13 2.0 -
9 Quantum Theory 114 112 121 -9 0.0 -
10 Captain Hindsight 111 112 117 -5 0.0 -
11 Swing Upon A Star 105 102 109 -7 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