Official NHA Assessment

Race 5: TABGOLD SCORE 10 MR 67 HANDICAP (Open)

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Line Horse
Purple Powahouse
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
5 / 8
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    Stevie Gee           5    52.5    1    0.00     0.0   55    52           55    +0
2    Purple Powahouse     8    58.0    2    2.60     0.0   63    63           63    +0
3    Phaka Imali          3    61.0    3    3.20     3.0   69    63           63    -6
4    Anotherdayinafrica   6    55.0    4    5.80     0.0   57    57           57    +0
5    Silent Trigger       6    59.5    5    6.20     0.0   66    66           66    +0
99   Mac Hardy            4    54.5    99   0.00     3.5   -     49           49    +0
99   Dark Tide            5    55.0    99   0.00     0.0   -     57           57    +0
99   Granddaddy Purple    3    52.0    99   0.00     3.0   -     45           45    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Stevie Gee 55 65 55 +10 0.0 -
2 Purple Powahouse Line 63 55 63 -8 0.0
3 Phaka Imali 69 62 63 -1 3.0 -
4 Anotherdayinafrica 57 49 57 -8 0.0 -
5 Silent Trigger 66 60 66 -6 0.0 -
99 Mac Hardy - 64 49 +15 3.5 -
99 Dark Tide - 53 57 -4 0.0 -
99 Granddaddy Purple - 50 45 +5 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