Official NHA Assessment

Race 7: ONLINE FORM GUIDE www.gallop.co.za MR 76 HANDICAP (Open)

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Line Horse
Purple Operator
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
3 / 10
Within 2 points
Significant Diffs
5 / 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    William Rufus        2    62.0    1    0.00     3.5   80    83           80    +0
2    Hippocrates          3    57.0    2    0.60     5.0   70    70           70    +0
3    Purple Operator      3    58.5    3    1.90     5.0   73    73           73    +0
4    Purple Powahouse     8    53.0    4    2.70     0.0   62    72           72    +10
5    Buoyant Knight       3    59.5    5    3.10     5.0   82    75           75    -7
6    Gimme A Rainbow      4    59.0    6    3.90     6.0   77    72           72    -5
7    Captain Who          4    57.5    7    5.50     6.0   71    69           69    -2
8    Agressivo            3    57.0    8    5.60     5.0   70    70           70    +0
99   Cavalieri            5    58.5    99   0.00     0.0   -     83           83    +0
99   Lucky Dollar         2    55.0    99   0.00     3.5   -     69           69    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 William Rufus 80 88 80 +8 3.5 -
2 Hippocrates 70 68 70 -2 5.0 -
3 Purple Operator Line 73 74 73 +1 5.0
4 Purple Powahouse 62 55 72 -17 0.0 -
5 Buoyant Knight 82 82 75 +7 5.0 -
6 Gimme A Rainbow 77 74 72 +2 6.0 -
7 Captain Who 71 65 69 -4 6.0 -
8 Agressivo 70 67 70 -3 5.0 -
99 Cavalieri - 73 83 -10 0.0 -
99 Lucky Dollar - 85 69 +16 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