Official NHA Assessment

Race 5: SA DERBY 4 APRIL CLASSIFIED STAKES (For All Horses)

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Line Horse
Arlington Action
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
3 / 10
Within 2 points
Significant Diffs
4 / 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    Pomozelous           3    50.5    1    0.00     7.0   59    42           42    -17
2    Military Moves       2    56.0    2    0.70     0.0   78    73           73    -5
3    Euphrates            3    56.0    3    1.20     7.0   67    58           58    -9
4    Arlington Action     6    58.0    4    1.50     0.0   76    76           76    +0
5    Top Shelf Teddy      2    56.0    5    3.00     0.0   82    70           72    -10
6    Nuclear Force        5    52.5    6    3.40     0.0   63    62           62    -1
7    Banha Bridge         5    60.0    7    4.00     0.0   73    77           77    +4
8    Gold De Grace        4    49.5    8    4.20     3.5   50    49           49    -1
9    The Merciful         5    52.0    9    12.00    0.0   54    59           59    +5
99   Stop The Traffic     4    56.0    99   0.00     3.5   -     60           60    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Pomozelous 59 62 42 +20 7.0 -
2 Military Moves 78 75 73 +2 0.0 -
3 Euphrates 67 70 58 +12 7.0 -
4 Arlington Action Line 76 73 76 -3 0.0
5 Top Shelf Teddy 82 80 72 +8 0.0 -
6 Nuclear Force 63 61 62 -1 0.0 -
7 Banha Bridge 73 70 77 -7 0.0 -
8 Gold De Grace 50 51 49 +2 3.5 -
9 The Merciful 54 54 59 -5 0.0 -
99 Stop The Traffic - 65 60 +5 3.5 -
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