Official NHA Assessment

Race 5: BIDVEST MIDDLE STAKES (For horses with nett rating of 105 and below)

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Line Horse
Mount Darwin
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
1 / 9
Within 2 points
Significant Diffs
7 / 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    Indian Ocean         3    59.5    1    0.00     8.0   105   98           98    -7
2    Two Miles West       3    52.0    2    2.00     8.0   86    88           88    +2
3    Tamarisk Tree        5    56.0    3    2.25     0.0   92    112          112   +20
4    Mount Darwin         3    54.5    4    3.75     8.0   90    90           90    +0
5    Imperial Master      4    56.0    5    4.50     4.5   93    99           99    +6
6    Royal Edition        4    52.0    6    11.75    4.5   85    90           90    +5
7    Afraad               8    50.0    7    13.00    0.0   80    95           95    +15
8    Scarlett Pimpernel   2    56.5    8    20.00    0.0   97    108          108   +11
9    Sugar Blast          2    60.0    9    27.00    0.0   102   115          115   +13
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Indian Ocean 105 107 98 +9 8.0 -
2 Two Miles West 86 93 88 +5 8.0 -
3 Tamarisk Tree 92 105 112 -7 0.0 -
4 Mount Darwin Line 90 81 90 -9 8.0
5 Imperial Master 93 90 99 -9 4.5 -
6 Royal Edition 85 92 90 +2 4.5 -
7 Afraad 80 79 95 -16 0.0 -
8 Scarlett Pimpernel 97 90 108 -18 0.0 -
9 Sugar Blast 102 102 115 -13 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