Official NHA Assessment

Race 4: ONLINE FORM GUIDE www.gallop.co.za MR 68 HANDICAP (Open)

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Line Horse
Purple Powahouse
Reference for assessment
Exact Matches
2 / 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    Ndaka                3    56.5    1    0.00     3.0   61    55           61    +0
2    Sakhala Is'Cathulo   3    61.5    2    2.10     3.0   75    65           65    -10
3    Purple Powahouse     8    57.5    3    2.70     0.0   63    63           63    +0
4    Granddaddy Purple    3    52.5    4    3.40     3.0   50    47           47    -3
5    Drogarati            4    52.5    5    3.60     3.5   56    46           46    -10
6    Servilius            3    60.5    6    4.30     3.0   69    63           63    -6
7    Victor Rail          5    56.5    7    4.55     0.0   64    61           61    -3
8    Cotton Ron           6    60.5    8    4.85     0.0   69    69           69    +0
9    Watch Tower          2    59.5    9    6.65     2.0   71    63           63    -8
10   Lightning Jimmy      4    61.5    10   11.95    3.5   75    64           65    -10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Ndaka 61 61 61 ✓ Match 3.0 -
2 Sakhala Is'Cathulo 75 66 65 +1 3.0 -
3 Purple Powahouse Line 63 55 63 -8 0.0
4 Granddaddy Purple 50 50 47 +3 3.0 -
5 Drogarati 56 52 46 +6 3.5 -
6 Servilius 69 65 63 +2 3.0 -
7 Victor Rail 64 61 61 ✓ Match 0.0 -
8 Cotton Ron 69 59 69 -10 0.0 -
9 Watch Tower 71 68 63 +5 2.0 -
10 Lightning Jimmy 75 48 65 -17 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