Official NHA Assessment

Race 1: 4RACING WELCOMES YOU MAIDEN PLATE (For all Maidens. R15 000 Win bonus ROA Members)

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Line Horse
Mary's Greenlight
Reference for assessment
Exact Matches
0 / 13
Calculated = Official
Close Matches
0 / 13
Within 2 points
Significant Diffs
13 / 13
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    Mary's Greenlight    4    55.0    1    0.00     3.5   82    82           82    +0
2    John Wick            2    58.0    2    2.25     0.0   75    98           98    +23
3    The Octagon          2    58.0    3    6.00     0.0   -     95           95    +95
4    Callaburn            2    58.0    4    6.50     0.0   72    95           95    +23
5    Horsefly             2    58.0    5    9.50     0.0   78    95           95    +17
6    Keiras Ranger        2    58.0    6    9.75     0.0   56    95           95    +39
7    Glacier Bay          3    58.0    7    13.00    6.0   -     83           83    +83
8    Pedasos              3    56.0    8    13.25    6.0   50    79           79    +29
9    Hat Furious          4    58.0    9    13.50    3.5   -     88           88    +88
10   Hunting Ground       3    58.0    10   14.75    6.0   55    83           83    +28
99   Bob                  3    58.0    99   0.00     6.0   -     83           83    +0
99   Pearl Harbor         2    58.0    99   0.00     0.0   -     95           95    +0
99   Trip To States       5    60.0    99   0.00     0.0   -     99           99    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Mary's Greenlight Line 82 103 82 +21 3.5
2 John Wick 75 82 98 -16 0.0 -
3 The Octagon - 76 95 -19 0.0 -
4 Callaburn 72 52 95 -43 0.0 -
5 Horsefly 78 73 95 -22 0.0 -
6 Keiras Ranger 56 64 95 -31 0.0 -
7 Glacier Bay - 50 83 -33 6.0 -
8 Pedasos 50 53 79 -26 6.0 -
9 Hat Furious - 53 88 -35 3.5 -
10 Hunting Ground 55 50 83 -33 6.0 -
99 Bob - 52 83 -31 6.0 -
99 Pearl Harbor - 62 95 -33 0.0 -
99 Trip To States - 63 99 -36 0.0 -
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