Official NHA Assessment

Race 5: DRAKENSTEIN STUD PROGRESS PLATE (3-year-olds) (Maidens, 1, 2 & 3 time winners (3-year-olds))

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Line Horse
Quantum Theory
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
0 / 9
Within 2 points
Significant Diffs
8 / 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    Prophet              2    60.0    1    0.00     0.0   106   104          104   -2
2    Quantum Theory       5    60.0    2    1.00     0.0   108   108          108   +0
3    Arividicio           5    57.0    3    1.20     0.0   87    102          102   +15
4    Boisterous           2    57.0    4    1.30     0.0   90    101          101   +11
5    Laguna Verde         5    57.0    5    4.30     0.0   104   98           98    -6
6    Bless My Stars       2    54.0    6    5.00     0.0   103   92           93    -10
7    Acorn                2    57.0    7    5.30     0.0   96    98           98    +2
8    Houston              3    57.0    8    10.30    8.0   82    82           82    +0
9    Eyjafjallajokull     2    57.0    9    26.80    0.0   94    98           98    +4
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Prophet 106 66 104 -38 0.0 -
2 Quantum Theory Line 108 112 108 +4 0.0
3 Arividicio 87 50 102 -52 0.0 -
4 Boisterous 90 87 101 -14 0.0 -
5 Laguna Verde 104 86 98 -12 0.0 -
6 Bless My Stars 103 119 93 +26 0.0 -
7 Acorn 96 89 98 -9 0.0 -
8 Houston 82 69 82 -13 8.0 -
9 Eyjafjallajokull 94 86 98 -12 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