Official NHA Assessment

Race 3: www.tabgold.co.za MR 73 HANDICAP (Open)

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Line Horse
Admiral Birnham
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
2 / 11
Within 2 points
Significant Diffs
7 / 11
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    Forward Spell        3    58.0    1    0.00     1.5   72    67           72    +0
2    Double Espresso      5    55.0    2    1.05     0.0   63    70           70    +7
3    Admiral Birnham      3    59.0    3    2.15     1.5   74    74           74    +0
4    Clarkson             4    58.5    4    2.40     0.5   70    74           74    +4
5    Caesura              6    56.0    5    2.45     0.0   73    70           70    -3
6    Coromandel           4    56.0    6    2.75     0.5   65    68           68    +3
7    Living Waters        5    55.5    7    3.15     0.0   64    68           68    +4
8    Pewter Sky           3    57.0    8    3.65     1.5   70    68           68    -2
8    Atomic Blonde        5    57.5    8    3.65     0.0   68    72           72    +4
10   Lucretius            6    53.5    10   4.35     0.0   66    62           62    -4
11   Querari's Cowboy     5    59.0    11   5.65     0.0   71    72           72    +1
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Forward Spell 72 64 72 -8 1.5 -
2 Double Espresso 63 60 70 -10 0.0 -
3 Admiral Birnham Line 74 68 74 -6 1.5
4 Clarkson 70 75 74 +1 0.5 -
5 Caesura 73 81 70 +11 0.0 -
6 Coromandel 65 59 68 -9 0.5 -
7 Living Waters 64 59 68 -9 0.0 -
8 Pewter Sky 70 71 68 +3 1.5 -
8 Atomic Blonde 68 68 72 -4 0.0 -
10 Lucretius 66 64 62 +2 0.0 -
11 Querari's Cowboy 71 62 72 -10 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