Official NHA Assessment

Race 3: GAUTENG GUINEAS DAY 4 FEBRUARY MIDDLE STAKES (For horses with nett rating of 101 and below)

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Line Horse
Imperial Master
Reference for assessment
Exact Matches
0 / 6
Calculated = Official
Close Matches
1 / 6
Within 2 points
Significant Diffs
5 / 6
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    Tabebuia             3    54.0    1    0.00     6.0   81    70           70    -11
2    Imperial Master      4    58.0    2    1.50     3.0   89    89           89    +0
3    Supreme Dance        4    60.0    3    9.75     3.0   96    88           88    -8
4    Great Affair         7    54.0    4    10.00    0.0   79    82           82    +3
5    The Brief            3    54.0    5    13.00    6.0   80    70           70    -10
6    Captain Chorus       5    56.0    6    16.00    0.0   82    86           86    +4
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Tabebuia 81 94 70 +24 6.0 -
2 Imperial Master Line 89 90 89 +1 3.0
3 Supreme Dance 96 76 88 -12 3.0 -
4 Great Affair 79 63 82 -19 0.0 -
5 The Brief 80 90 70 +20 6.0 -
6 Captain Chorus 82 67 86 -19 0.0 -
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