Official NHA Assessment

Race 1: 4RACING WELCOMES YOU WORK RIDERS MAIDEN PLATE (F & M) (For Maiden Fillies and Mares)

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Line Horse
Plumbago Park
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
8 / 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    Plumbago Park        2    60.0    1    0.00     4.0   79    79           79    +0
2    Taking A Risk        2    60.0    2    2.75     4.0   72    79           79    +7
3    Hurricane Power      2    60.0    3    4.15     4.0   60    79           79    +19
4    Princess Of All      3    60.0    4    4.25     6.0   -     75           75    +75
5    Chilli Marmalade     5    60.0    5    13.75    0.0   53    87           87    +34
6    Memphis              2    60.0    6    16.95    4.0   43    79           79    +36
7    Jazz Away            2    60.0    7    18.45    4.0   63    79           79    +16
8    Katya Kabanova       3    60.0    8    23.25    6.0   -     75           75    +75
9    Raceway              2    60.0    9    99.99    4.0   74    79           79    +5
99   Erebus               2    60.0    99   0.00     4.0   -     79           79    +0
99   Duchess Zahra        3    60.0    99   0.00     6.0   -     75           75    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Plumbago Park Line 79 72 79 -7 4.0
2 Taking A Risk 72 70 79 -9 4.0 -
3 Hurricane Power 60 63 79 -16 4.0 -
4 Princess Of All - 73 75 -2 6.0 -
5 Chilli Marmalade 53 48 87 -39 0.0 -
6 Memphis 43 40 79 -39 4.0 -
7 Jazz Away 63 64 79 -15 4.0 -
8 Katya Kabanova - 26 75 -49 6.0 -
9 Raceway 74 74 79 -5 4.0 -
99 Erebus - 66 79 -13 4.0 -
99 Duchess Zahra - 76 75 +1 6.0 -
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