Official NHA Assessment

Race 4: WSB GRAND HERITAGE 20 DECEMBER MR 96 HANDICAP (Open)

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Line Horse
Jordan
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
2 / 10
Within 2 points
Significant Diffs
5 / 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    Hawkbill             4    59.5    1    0.00     3.5   95    93           95    +0
2    Vesuvio              5    55.5    2    1.25     0.0   87    96           96    +9
3    Jordan               4    55.0    3    2.55     3.5   86    86           86    +0
4    Tommy Shelby         2    53.5    4    2.95     0.0   97    90           90    -7
5    Battleground         5    57.5    5    3.55     0.0   91    97           97    +6
6    Arumugam             6    52.0    6    3.65     0.0   79    86           86    +7
7    Chestnut Bomber      3    59.0    7    3.85     7.0   95    86           86    -9
8    Flashy Apache        6    49.5    8    4.65     0.0   83    80           80    -3
9    King's Express       3    60.5    9    4.85     7.0   102   88           92    -10
10   Beynac               2    57.5    10   8.15     0.0   92    96           96    +4
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Hawkbill 95 100 95 +5 3.5 -
2 Vesuvio 87 85 96 -11 0.0 -
3 Jordan Line 86 88 86 +2 3.5
4 Tommy Shelby 97 101 90 +11 0.0 -
5 Battleground 91 92 97 -5 0.0 -
6 Arumugam 79 74 86 -12 0.0 -
7 Chestnut Bomber 95 90 86 +4 7.0 -
8 Flashy Apache 83 78 80 -2 0.0 -
9 King's Express 102 102 92 +10 7.0 -
10 Beynac 92 90 96 -6 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