Official NHA Assessment

Race 7: GREYVILLE CONVENTION CENTRE FM 86 HANDICAP (F & M) (For Fillies and Mares)

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Line Horse
Petra
Reference for assessment
Exact Matches
2 / 10
Calculated = Official
Close Matches
3 / 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    Boldly Go            4    55.5    1    0.00     0.0   77    77           77    +0
2    Petra                6    61.0    2    1.10     0.0   88    88           88    +0
3    Lady Legend          5    60.0    3    1.15     0.0   89    86           86    -3
4    Dubawi Princess      4    58.0    4    1.20     0.0   82    82           82    +0
5    Winter Furi          4    60.5    5    1.80     0.0   87    87           87    +0
6    Blush Of Dawn        8    55.0    6    3.00     0.0   76    76           76    +0
7    Purple Nkanyezi      5    60.0    7    3.15     0.0   86    86           86    +0
8    Purple Merchant      4    53.5    8    3.85     0.0   81    73           73    -8
9    Travelling Light     5    58.5    9    7.15     0.0   83    83           83    +0
99   Gardenia             5    53.0    99   0.00     0.0   -     72           72    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Boldly Go 77 79 77 +2 0.0 -
2 Petra Line 88 84 88 -4 0.0
3 Lady Legend 89 92 86 +6 0.0 -
4 Dubawi Princess 82 82 82 ✓ Match 0.0 -
5 Winter Furi 87 87 87 ✓ Match 0.0 -
6 Blush Of Dawn 76 64 76 -12 0.0 -
7 Purple Nkanyezi 86 80 86 -6 0.0 -
8 Purple Merchant 81 94 73 +21 0.0 -
9 Travelling Light 83 80 83 -3 0.0 -
99 Gardenia - 75 72 +3 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