Official NHA Assessment

Race 3: OK SHOPPERS CHOICE MERIT RATED 65 HANDICAP (Open)

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Line Horse
Chetan
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
4 / 11
More than 5 points
Detailed Assessment
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Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
------------------------------------------------------------------------------------------------------------------------
1    Cool Solution        9    58.0    1    0.00     0.0   60    64           60    +0
2    Kursk (AUS)          6    61.5    2    0.25     0.0   68    71           71    +3
3    Ian's Ferrari        3    57.0    3    0.30     1.5   62    64           64    +2
4    Chetan               3    54.5    4    1.55     1.5   57    57           57    +0
5    Mill Creek           7    54.0    5    2.55     0.0   53    58           58    +5
6    Deposition           6    59.5    6    2.80     0.0   64    69           69    +5
7    Ginjamatinja         3    52.0    7    4.80     1.5   47    49           49    +2
8    Bruce's Spirit       6    55.0    8    5.25     0.0   58    58           58    +0
9    Queen Of Dallas      3    53.5    9    6.50     1.5   55    52           52    -3
99   Jardin               6    57.5    99   0.00     0.0   -     63           63    +0
99   Differentiate        5    58.0    99   0.00     0.0   -     64           64    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Cool Solution 60 51 60 -9 0.0 -
2 Kursk (AUS) 68 67 71 -4 0.0 -
3 Ian's Ferrari 62 63 64 -1 1.5 -
4 Chetan Line 57 45 57 -12 1.5
5 Mill Creek 53 55 58 -3 0.0 -
6 Deposition 64 68 69 -1 0.0 -
7 Ginjamatinja 47 45 49 -4 1.5 -
8 Bruce's Spirit 58 55 58 -3 0.0 -
9 Queen Of Dallas 55 40 52 -12 1.5 -
99 Jardin - 60 63 -3 0.0 -
99 Differentiate - 72 64 +8 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