Official NHA Assessment

Race 7: GREYVILLE CONVENTION CENTRE FM 83 HANDICAP (F & M) (For Fillies and Mares)

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Line Horse
Lady Macbeth
Reference for assessment
Exact Matches
1 / 12
Calculated = Official
Close Matches
3 / 12
Within 2 points
Significant Diffs
5 / 12
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    Purple Nkanyezi      5    59.0    1    0.00     0.0   81    93           81    +0
2    Lady Macbeth         3    52.5    2    1.80     3.5   73    73           73    +0
3    Dubawi Princess      4    59.5    3    1.85     4.0   82    86           86    +4
4    Nikiya               6    58.0    4    1.90     0.0   82    91           91    +9
5    Pelargonium          3    58.0    5    1.95     3.5   84    84           84    +0
6    Captain Ariano       4    58.5    6    2.70     4.0   80    84           84    +4
7    Irish Belle          4    59.0    7    4.60     4.0   81    85           85    +4
8    Ancient Epic         3    52.0    8    4.90     3.5   80    72           72    -8
9    Goddess Of Light     3    56.5    9    8.60     3.5   81    81           81    +0
10   Purple Moon's Up     4    60.0    10   16.90    4.0   83    87           87    +4
11   Travelling Light     5    60.0    11   19.80    0.0   83    95           95    +12
99   Toto                 4    57.0    99   0.00     4.0   -     81           81    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Purple Nkanyezi 81 80 81 -1 0.0 -
2 Lady Macbeth Line 73 68 73 -5 3.5
3 Dubawi Princess 82 82 86 -4 4.0 -
4 Nikiya 82 75 91 -16 0.0 -
5 Pelargonium 84 84 84 ✓ Match 3.5 -
6 Captain Ariano 80 63 84 -21 4.0 -
7 Irish Belle 81 80 85 -5 4.0 -
8 Ancient Epic 80 88 72 +16 3.5 -
9 Goddess Of Light 81 63 81 -18 3.5 -
10 Purple Moon's Up 83 83 87 -4 4.0 -
11 Travelling Light 83 80 95 -15 0.0 -
99 Toto - 79 81 -2 4.0 -
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