Official NHA Assessment

Race 1: MASTER ARCHIE AT STUD MAIDEN PLATE (A) (For all Maidens)

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Line Horse
So Seductive
Reference for assessment
Exact Matches
0 / 12
Calculated = Official
Close Matches
1 / 12
Within 2 points
Significant Diffs
10 / 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    So Seductive         2    57.5    1    0.00     2.0   80    80           80    +0
2    Vibe Sa              2    60.0    2    0.50     2.0   83    85           85    +2
3    Parisian Walkway     3    57.0    3    4.50     3.0   -     77           77    +77
4    His Lordship         3    60.0    4    10.00    3.0   -     83           83    +83
5    Captain Jim          3    60.0    5    15.00    3.0   -     83           83    +83
6    Someday Maybe        3    57.5    6    19.00    3.0   65    78           78    +13
7    Ingqwele             3    57.0    7    19.25    3.0   -     77           77    +77
8    Lets Play Poker      3    60.0    8    99.99    3.0   -     83           83    +83
9    Ritirata             3    57.5    9    99.99    3.0   -     78           78    +78
99   Trombettista         2    60.0    99   0.00     2.0   -     85           85    +0
99   Gold Agent           2    56.0    99   0.00     2.0   -     77           77    +0
99   High Queue           4    60.0    99   0.00     3.5   -     82           82    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 So Seductive Line 80 89 80 +9 2.0
2 Vibe Sa 83 92 85 +7 2.0 -
3 Parisian Walkway - 113 77 +36 3.0 -
4 His Lordship - 85 83 +2 3.0 -
5 Captain Jim - 54 83 -29 3.0 -
6 Someday Maybe 65 56 78 -22 3.0 -
7 Ingqwele - 84 77 +7 3.0 -
8 Lets Play Poker - 78 83 -5 3.0 -
9 Ritirata - - 78 -78 3.0 -
99 Trombettista - 63 85 -22 2.0 -
99 Gold Agent - 64 77 -13 2.0 -
99 High Queue - 74 82 -8 3.5 -
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