Official NHA Assessment

Race 7: GARETH VAN ZYL CLASS 4 (F & M) (For Fillies & Mares. Benchmark at 60.0kg = 80)

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Line Horse
Siberian Winter
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
1 / 9
Within 2 points
Significant Diffs
6 / 9
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    Buttercup Baby       3    60.5    1    0.00     10.5  81    84           84    +3
2    Rugger Lover         2    58.5    2    0.50     7.0   77    87           87    +10
3    Emerald Green        4    59.0    3    1.70     12.0  78    78           78    +0
4    Siberian Winter      3    55.0    4    2.00     10.5  73    73           73    +0
5    Willow Gem           2    52.5    5    2.50     7.0   84    75           75    -9
6    Getoffofmycloud      3    56.5    6    3.80     10.5  73    76           76    +3
7    Avernian Goddess     3    61.0    7    4.90     10.5  82    85           85    +3
8    Ayuwi Yuwi           2    60.5    8    5.80     7.0   81    91           91    +10
9    Ladybug              3    60.0    9    6.40     10.5  80    83           83    +3
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Buttercup Baby 81 98 84 +14 10.5 -
2 Rugger Lover 77 79 87 -8 7.0 -
3 Emerald Green 78 75 78 -3 12.0 -
4 Siberian Winter Line 73 79 73 +6 10.5
5 Willow Gem 84 77 75 +2 7.0 -
6 Getoffofmycloud 73 66 76 -10 10.5 -
7 Avernian Goddess 82 91 85 +6 10.5 -
8 Ayuwi Yuwi 81 71 91 -20 7.0 -
9 Ladybug 80 80 83 -3 10.5 -
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