Official NHA Assessment

Race 4: WILGERBOSDRIFT MAIDEN PLATE (For all Maidens)

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Line Horse
Vixeninthevineyard
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
5 / 8
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    Scarlet O'Hara       3    56.5    1    0.00     5.0   -     54           6     +6
2    Vixeninthevineyard   2    56.5    2    1.00     0.0   68    68           68    +0
3    Royale Jacket        2    60.0    3    1.10     0.0   73    75           75    +2
4    Shadowline           3    52.5    4    3.50     5.0   70    47           60    -10
5    Knowmore             3    60.0    5    4.25     5.0   77    62           67    -10
6    Manz Knight          6    58.5    6    8.50     0.0   60    68           68    +8
7    My Queen Amanat      3    56.5    7    21.25    5.0   60    54           54    -6
99   Anonymous            4    60.0    99   0.00     2.5   -     66           66    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Scarlet O'Hara - 82 6 +76 5.0 -
2 Vixeninthevineyard Line 68 64 68 -4 0.0
3 Royale Jacket 73 74 75 -1 0.0 -
4 Shadowline 70 78 60 +18 5.0 -
5 Knowmore 77 76 67 +9 5.0 -
6 Manz Knight 60 60 68 -8 0.0 -
7 My Queen Amanat 60 57 54 +3 5.0 -
99 Anonymous - 50 66 -16 2.5 -
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