Official NHA Assessment

Race 4: CHAMPION OWNER: DRAKENSTEIN STUD (Nom: Mrs G A Rupert) MAIDEN PLATE (For all Maidens)

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Line Horse
Old Fashioned
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
6 / 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    Palace Prince        2    57.0    1    0.00     1.0   -     69           6     +6
2    Stone Of Scone       2    54.5    2    1.40     1.0   -     64           64    +64
3    Space Mission        2    57.0    3    3.40     1.0   -     69           69    +69
4    Old Fashioned        3    60.0    4    3.80     2.0   73    73           73    +0
5    Lance Alot           2    57.0    5    5.50     1.0   -     69           69    +69
6    Trombettista         2    60.0    6    7.80     1.0   63    75           75    +12
7    Dragonheart          2    57.0    7    99.99    1.0   -     69           69    +69
99   Emerald Forge        2    54.5    99   0.00     1.0   -     64           64    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Palace Prince - 103 6 +97 1.0 -
2 Stone Of Scone - 72 64 +8 1.0 -
3 Space Mission - 75 69 +6 1.0 -
4 Old Fashioned Line 73 76 73 +3 2.0
5 Lance Alot - 68 69 -1 1.0 -
6 Trombettista 63 63 75 -12 1.0 -
7 Dragonheart - 46 69 -23 1.0 -
99 Emerald Forge - 72 64 +8 1.0 -
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