Official NHA Assessment

Race 1: TRACK AND BALL GAMING MAIDEN PLATE (For all Maidens)

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Line Horse
Plettenberg
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
7 / 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    Plettenberg          3    58.5    1    0.00     3.5   74    74           74    +0
2    Rototo               3    60.0    2    0.40     3.5   -     77           77    +77
3    Hoodwinked           3    60.0    3    0.65     3.5   -     77           77    +77
4    Red Mountain         4    60.0    4    0.95     4.0   78    76           76    -2
5    Nantes Festival      2    60.0    5    1.95     2.5   66    79           79    +13
6    Evies Horizon        2    60.0    6    2.25     2.5   -     79           79    +79
7    Summer Shade         4    60.0    7    6.05     4.0   68    76           76    +8
99   Apex Predator        4    60.0    99   0.00     4.0   -     76           76    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Plettenberg Line 74 59 74 -15 3.5
2 Rototo - 61 77 -16 3.5 -
3 Hoodwinked - 67 77 -10 3.5 -
4 Red Mountain 78 77 76 +1 4.0 -
5 Nantes Festival 66 51 79 -28 2.5 -
6 Evies Horizon - 63 79 -16 2.5 -
7 Summer Shade 68 52 76 -24 4.0 -
99 Apex Predator - 69 76 -7 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