Official NHA Assessment

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Line Horse
City Lights
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    Party Punch          3    55.0    1    0.00     1.5   -     55           6     +6
2    City Lights          4    60.0    2    0.20     0.5   67    67           67    +0
3    Enchanted Royal      3    56.0    3    5.25     1.5   40    57           57    +17
4    Angel Of My Heart    3    60.0    4    5.50     1.5   62    65           65    +3
5    Butternutenrooiwyn   2    60.0    5    5.60     0.0   64    68           68    +4
6    Incredible Indrani   3    60.0    6    11.75    1.5   64    65           65    +1
7    Sienna Rae           2    55.0    7    12.75    0.0   -     58           58    +58
8    Perform              2    60.0    8    14.00    0.0   55    68           68    +13
9    Spirit In The Wind   4    60.0    9    15.50    0.5   55    67           67    +12
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Party Punch - 62 6 +56 1.5 -
2 City Lights Line 67 52 67 -15 0.5
3 Enchanted Royal 40 49 57 -8 1.5 -
4 Angel Of My Heart 62 51 65 -14 1.5 -
5 Butternutenrooiwyn 64 60 68 -8 0.0 -
6 Incredible Indrani 64 68 65 +3 1.5 -
7 Sienna Rae - 57 58 -1 0.0 -
8 Perform 55 54 68 -14 0.0 -
9 Spirit In The Wind 55 60 67 -7 0.5 -
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