Official NHA Assessment

Race 3: CHILD WELFARE CHATSWORTH MAIDEN PLATE (For all Maidens)

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Line Horse
Fire Force
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
1 / 11
Within 2 points
Significant Diffs
6 / 11
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    Bad Medicine         3    60.0    1    0.00     4.5   76    57           57    -19
2    Silver Platter       4    60.0    2    3.60     2.0   66    65           65    -1
3    Fire Force           4    60.0    3    4.50     2.0   63    63           63    +0
4    I Am Classy          3    58.5    4    6.10     4.5   69    54           59    -10
5    Augrabies            3    60.0    5    6.70     4.5   -     57           57    +57
6    Mind How You Go      3    56.0    6    8.10     4.5   61    49           51    -10
7    The Green Gallant    6    60.0    7    10.90    0.0   56    66           66    +10
8    Cuzzie               3    60.0    8    12.40    4.5   78    57           68    -10
9    Seattle Rain         3    56.5    9    13.50    4.5   49    50           50    +1
10   Mont Tremblant       3    56.0    10   14.20    4.5   69    49           59    -10
11   Mumsy's Glory        3    60.0    11   99.99    4.5   33    57           57    +24
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Bad Medicine 76 100 57 +43 4.5 -
2 Silver Platter 66 69 65 +4 2.0 -
3 Fire Force Line 63 60 63 -3 2.0
4 I Am Classy 69 67 59 +8 4.5 -
5 Augrabies - 56 57 -1 4.5 -
6 Mind How You Go 61 59 51 +8 4.5 -
7 The Green Gallant 56 55 66 -11 0.0 -
8 Cuzzie 78 54 68 -14 4.5 -
9 Seattle Rain 49 55 50 +5 4.5 -
10 Mont Tremblant 69 56 59 -3 4.5 -
11 Mumsy's Glory 33 33 57 -24 4.5 -
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