Official NHA Assessment

Race 4: BETWAY MAIDEN PLATE (3 year-olds) (For Maiden 3 year-olds. R15 000 Win bonus ROA Members)

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Line Horse
Sienna Rae
Reference for assessment
Exact Matches
0 / 7
Calculated = Official
Close Matches
0 / 7
Within 2 points
Significant Diffs
5 / 7
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    Jaham                3    60.0    1    0.00     9.5   -     50           6     +6
2    Snow Moon            3    57.5    2    2.75     9.5   69    47           59    -10
3    Roman's Revenge      2    60.0    3    6.00     0.0   83    69           73    -10
4    Sienna Rae           2    56.5    4    14.00    0.0   62    62           62    +0
5    Royal Miracle        3    60.0    5    15.50    9.5   66    50           56    -10
6    Quelimane            2    60.0    6    99.99    0.0   78    69           69    -9
7    Musical Angel        3    56.5    7    99.99    9.5   -     43           43    +43
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Jaham - 89 6 +83 9.5 -
2 Snow Moon 69 68 59 +9 9.5 -
3 Roman's Revenge 83 89 73 +16 0.0 -
4 Sienna Rae Line 62 57 62 -5 0.0
5 Royal Miracle 66 66 56 +10 9.5 -
6 Quelimane 78 73 69 +4 0.0 -
7 Musical Angel - - 43 -43 9.5 -
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