Official NHA Assessment

Race 4: SA DERBY 4 APRIL MAIDEN PLATE (For all Maidens)

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Line Horse
Shoreybomba
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
2 / 10
Within 2 points
Significant Diffs
7 / 10
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    Porridge Boy         2    60.0    1    0.00     0.0   101   83           83    -18
2    One Of Those Days    3    60.0    2    0.40     3.0   78    82           82    +4
3    Night Skizzle        3    60.0    3    2.40     3.0   -     79           79    +79
4    Shoreybomba          3    60.0    4    3.40     3.0   78    78           78    +0
5    Lookout Mountain     3    60.0    5    6.60     3.0   -     77           77    +77
6    Sivaji               3    56.0    6    8.80     3.0   -     69           69    +69
7    Emerald Countess     2    57.0    7    15.90    0.0   72    77           77    +5
8    Jabberwocky          4    60.0    8    20.00    1.5   56    80           80    +24
9    Olympic Admiral      3    60.0    9    22.00    3.0   56    77           77    +21
99   Proper               3    60.0    99   0.00     3.0   -     77           77    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Porridge Boy 101 101 83 +18 0.0 -
2 One Of Those Days 78 81 82 -1 3.0 -
3 Night Skizzle - - 79 -79 3.0 -
4 Shoreybomba Line 78 77 78 -1 3.0
5 Lookout Mountain - 69 77 -8 3.0 -
6 Sivaji - 60 69 -9 3.0 -
7 Emerald Countess 72 72 77 -5 0.0 -
8 Jabberwocky 56 53 80 -27 1.5 -
9 Olympic Admiral 56 56 77 -21 3.0 -
99 Proper - - 77 -77 3.0 -
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