Official NHA Assessment

Race 7: CHRISTMAS HANDICAP (Listed) (Open)

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Line Horse
Isivivane
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
1 / 11
Within 2 points
Significant Diffs
9 / 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    Imposing             2    54.0    1    0.00     0.0   96    105          96    +0
2    Isivivane            3    53.5    2    2.00     6.0   95    95           95    +0
3    Capsaicin            4    52.0    3    2.80     3.0   90    97           97    +7
4    Down By The River    2    52.0    4    3.10     0.0   82    103          103   +21
5    Johnny The Thief     2    53.5    5    3.80     0.0   95    105          105   +10
6    Imilenzeyokududuma   6    62.5    6    4.80     0.0   113   122          122   +9
7    Go Grayson Go        3    54.5    7    5.20     6.0   97    94           94    -3
8    Diani                5    57.5    8    5.60     0.0   103   112          112   +9
9    Narina Trogon        5    58.5    9    7.40     0.0   105   114          114   +9
99   Field Marshal        3    59.5    99   0.00     6.0   -     104          104   +0
99   Claw                 4    53.0    99   0.00     3.0   -     97           97    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Imposing 96 107 96 +11 0.0 -
2 Isivivane Line 95 104 95 +9 6.0
3 Capsaicin 90 88 97 -9 3.0 -
4 Down By The River 82 95 103 -8 0.0 -
5 Johnny The Thief 95 95 105 -10 0.0 -
6 Imilenzeyokududuma 113 109 122 -13 0.0 -
7 Go Grayson Go 97 95 94 +1 6.0 -
8 Diani 103 96 112 -16 0.0 -
9 Narina Trogon 105 102 114 -12 0.0 -
99 Field Marshal - 107 104 +3 6.0 -
99 Claw - 91 97 -6 3.0 -
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