Official NHA Assessment

Race 8: SA DERBY 4 APRIL MR 82 HANDICAP (Open)

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Line Horse
One More Star
Reference for assessment
Exact Matches
0 / 13
Calculated = Official
Close Matches
0 / 13
Within 2 points
Significant Diffs
8 / 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    Councillor           3    53.5    1    0.00     4.5   78    65           78    +0
2    Royal Engagement     3    51.5    2    1.40     4.5   79    66           69    -10
3    One More Star        3    61.0    3    2.40     4.5   84    84           84    +0
4    Gimmeachoice         3    61.0    4    2.50     4.5   87    84           84    -3
5    Arlington Action     6    56.5    5    4.00     0.0   75    82           82    +7
6    Diesel's Shadow      4    60.0    6    4.20     2.0   82    85           85    +3
6    Kudzu                2    60.0    6    4.20     0.0   82    89           89    +7
8    Redlightgreenlight   2    57.0    8    5.00     0.0   85    81           81    -4
9    Mocha Frappe         2    54.5    9    6.20     0.0   71    76           76    +5
10   Naretoi              2    56.0    10   6.30     0.0   74    79           79    +5
11   Arumugam             6    56.5    11   7.70     0.0   75    80           80    +5
12   Flashy Apache        6    59.0    12   8.50     0.0   80    85           85    +5
13   World Order          2    56.5    13   9.90     0.0   84    80           80    -4
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Councillor 78 84 78 +6 4.5 -
2 Royal Engagement 79 80 69 +11 4.5 -
3 One More Star Line 84 87 84 +3 4.5
4 Gimmeachoice 87 87 84 +3 4.5 -
5 Arlington Action 75 73 82 -9 0.0 -
6 Diesel's Shadow 82 80 85 -5 2.0 -
6 Kudzu 82 80 89 -9 0.0 -
8 Redlightgreenlight 85 76 81 -5 0.0 -
9 Mocha Frappe 71 68 76 -8 0.0 -
10 Naretoi 74 73 79 -6 0.0 -
11 Arumugam 75 74 80 -6 0.0 -
12 Flashy Apache 80 78 85 -7 0.0 -
13 World Order 84 84 80 +4 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