Official NHA Assessment

Race 4: COMPUTAFORM WORK RIDERS MAIDEN PLATE (For all Maidens)

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Line Horse
Corapi
Reference for assessment
Exact Matches
1 / 12
Calculated = Official
Close Matches
3 / 12
Within 2 points
Significant Diffs
9 / 12
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    Corapi               3    59.0    1    0.00     4.0   74    74           74    +0
2    Castle Of Glass      3    59.0    2    2.00     4.0   70    77           77    +7
3    Great Melody         3    59.0    3    2.10     4.0   55    77           77    +22
4    Coming In Hot        3    59.0    4    2.75     4.0   74    76           76    +2
5    Ra'ed                4    60.0    5    11.25    2.5   64    79           79    +15
6    Choice Assorted      3    59.0    6    14.25    4.0   -     74           74    +74
7    Maddy Blue           3    59.0    7    14.40    4.0   62    74           74    +12
8    Soweto Spina         3    59.0    8    17.00    4.0   67    74           74    +7
9    The Great Romantic   3    59.0    9    99.99    4.0   34    74           74    +40
99   Thornton Creek       4    60.0    99   0.00     2.5   -     79           79    +0
99   Bye Bye Birdie       3    59.0    99   0.00     4.0   -     74           74    +0
99   East Coast Swing     3    59.0    99   0.00     4.0   -     74           74    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Corapi Line 74 67 74 -7 4.0
2 Castle Of Glass 70 79 77 +2 4.0 -
3 Great Melody 55 79 77 +2 4.0 -
4 Coming In Hot 74 76 76 ✓ Match 4.0 -
5 Ra'ed 64 49 79 -30 2.5 -
6 Choice Assorted - 59 74 -15 4.0 -
7 Maddy Blue 62 57 74 -17 4.0 -
8 Soweto Spina 67 49 74 -25 4.0 -
9 The Great Romantic 34 39 74 -35 4.0 -
99 Thornton Creek - 30 79 -49 2.5 -
99 Bye Bye Birdie - 57 74 -17 4.0 -
99 East Coast Swing - - 74 -74 4.0 -
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