Official NHA Assessment

Race 4: 4RACING DERBY TRIAL (Listed) (For 3 year-olds)

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Line Horse
African Torrent
Reference for assessment
Exact Matches
1 / 13
Calculated = Official
Close Matches
2 / 13
Within 2 points
Significant Diffs
10 / 13
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    Son Of Raj           5    55.5    1    0.00     0.0   75    76           76    +1
2    Future Pearl         2    57.0    2    3.00     0.0   81    82           82    +1
3    Top Sail             2    58.5    3    3.40     0.0   86    85           85    -1
4    African Torrent      2    58.5    4    3.50     0.0   85    85           85    +0
5    Climate Control      2    58.5    5    4.25     0.0   86    84           84    -2
6    Destiny Of Souls     2    60.0    6    4.75     0.0   90    85           85    -5
7    River Romeo          2    57.0    7    7.00     0.0   84    79           79    -5
8    Billy Spellbound     2    58.5    8    7.50     0.0   85    82           82    -3
9    Prime Example        2    55.5    9    9.00     0.0   74    76           76    +2
10   Jet Dynasty          3    55.5    10   9.50     4.5   79    67           69    -10
11   Battleground         5    57.0    11   23.00    0.0   80    79           79    -1
99   Greenbackcurrency    3    57.0    99   0.00     4.5   -     70           70    +0
99   Silvano's Song       3    55.5    99   0.00     4.5   -     67           67    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Son Of Raj 75 116 76 +40 0.0 -
2 Future Pearl 81 114 82 +32 0.0 -
3 Top Sail 86 85 85 ✓ Match 0.0 -
4 African Torrent Line 85 68 85 -17 0.0
5 Climate Control 86 65 84 -19 0.0 -
6 Destiny Of Souls 90 89 85 +4 0.0 -
7 River Romeo 84 94 79 +15 0.0 -
8 Billy Spellbound 85 73 82 -9 0.0 -
9 Prime Example 74 93 76 +17 0.0 -
10 Jet Dynasty 79 82 69 +13 4.5 -
11 Battleground 80 92 79 +13 0.0 -
99 Greenbackcurrency - 71 70 +1 4.5 -
99 Silvano's Song - 74 67 +7 4.5 -
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