Official NHA Assessment

Race 6: GREYVILLE CONVENTION CENTRE CLASS 5 (Open. Benchmark at 60.0kg = 66)

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Line Horse
Purple Powahouse
Reference for assessment
Exact Matches
1 / 10
Calculated = Official
Close Matches
4 / 10
Within 2 points
Significant Diffs
4 / 10
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    One Irish Rover      5    59.5    1    0.00     0.0   65    65           65    +0
2    Purple Powahouse     8    55.5    2    0.70     0.0   57    57           57    +0
3    Griffin Park         4    57.5    3    1.80     3.5   69    54           59    -10
4    Victor Rail          5    56.5    4    2.05     0.0   59    59           59    +0
5    Cappellino           3    58.5    5    3.25     3.0   63    57           57    -6
6    Arverni Princess     2    52.0    6    4.55     2.0   58    46           48    -10
7    Music Is Life        2    60.5    7    6.35     2.0   67    63           63    -4
8    Lightning Jimmy      4    56.5    8    8.45     3.5   59    52           52    -7
9    My Siraya            3    60.0    9    10.15    3.0   70    60           60    -10
99   Inafix               4    60.0    99   0.00     3.5   -     59           59    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 One Irish Rover 65 65 65 ✓ Match 0.0 -
2 Purple Powahouse Line 57 55 57 -2 0.0
3 Griffin Park 69 58 59 -1 3.5 -
4 Victor Rail 59 61 59 +2 0.0 -
5 Cappellino 63 61 57 +4 3.0 -
6 Arverni Princess 58 67 48 +19 2.0 -
7 Music Is Life 67 71 63 +8 2.0 -
8 Lightning Jimmy 59 48 52 -4 3.5 -
9 My Siraya 70 70 60 +10 3.0 -
99 Inafix - 69 59 +10 3.5 -
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