Official NHA Assessment

Race 6: PURPLE SLEIGH SPRINT MIDDLE STAKES (For All Horses)

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Line Horse
Tara Star
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
1 / 11
Within 2 points
Significant Diffs
8 / 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    Soho Star            3    57.5    1    0.00     6.0   102   101          101   -1
2    Magic Surprise       2    51.5    2    0.40     4.0   78    93           93    +15
3    Icy Blast            4    57.0    3    0.70     7.0   89    98           98    +9
4    Tara Star            4    53.5    4    1.50     7.0   91    91           91    +0
5    African Skyline      6    57.5    5    2.70     0.0   101   113          113   +12
6    Hithemhardsunshine   2    58.5    6    3.80     4.0   93    107          107   +14
7    Position Of Power    3    55.5    7    3.85     6.0   85    97           97    +12
8    Good Traveller       6    58.5    8    5.05     0.0   93    115          115   +22
9    Diani                5    60.5    9    5.45     0.0   103   119          119   +16
10   Super Fast           5    51.5    10   5.60     0.0   83    101          101   +18
11   Narina Trogon        5    63.0    11   7.50     0.0   105   124          124   +19
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Soho Star 102 105 101 +4 6.0 -
2 Magic Surprise 78 92 93 -1 4.0 -
3 Icy Blast 89 88 98 -10 7.0 -
4 Tara Star Line 91 96 91 +5 7.0
5 African Skyline 101 98 113 -15 0.0 -
6 Hithemhardsunshine 93 92 107 -15 4.0 -
7 Position Of Power 85 90 97 -7 6.0 -
8 Good Traveller 93 108 115 -7 0.0 -
9 Diani 103 96 119 -23 0.0 -
10 Super Fast 83 83 101 -18 0.0 -
11 Narina Trogon 105 102 124 -22 0.0 -
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