Official NHA Assessment

Race 4: GAUTENG GUINEAS DAY 4 FEBRUARY GRADUATION PLATE (For 1 & 2 Time Winners & Maidens)

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Line Horse
Raffles
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
0 / 9
Within 2 points
Significant Diffs
9 / 9
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    Unzen                3    56.0    1    0.00     4.0   106   90           78    -28
2    Raffles              2    56.0    2    4.25     0.0   99    99           99    +0
3    Houston              3    56.0    3    7.50     4.0   86    90           90    +4
4    Golden Prospect      2    56.0    4    11.00    0.0   96    98           98    +2
5    La Luvia             4    55.5    5    12.00    2.5   75    92           92    +17
6    Thambi               5    55.5    6    15.00    0.0   81    97           97    +16
7    Picture Perfect      3    60.0    7    99.99    4.0   80    98           98    +18
99   Bowl First           3    56.0    99   0.00     4.0   -     90           90    +0
99   Rain Or Shine        4    57.5    99   0.00     2.5   -     96           96    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Unzen 106 116 78 +38 4.0 -
2 Raffles Line 99 105 99 +6 0.0
3 Houston 86 69 90 -21 4.0 -
4 Golden Prospect 96 83 98 -15 0.0 -
5 La Luvia 75 71 92 -21 2.5 -
6 Thambi 81 55 97 -42 0.0 -
7 Picture Perfect 80 80 98 -18 4.0 -
99 Bowl First - 78 90 -12 4.0 -
99 Rain Or Shine - 82 96 -14 2.5 -
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