Official NHA Assessment

Race 6: FREE KIDDIES ENTERTAINMENT 09 DECEMBER MR 84 HANDICAP (Open)

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Line Horse
Battleground
Reference for assessment
Exact Matches
0 / 8
Calculated = Official
Close Matches
1 / 8
Within 2 points
Significant Diffs
5 / 8
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    Rule Book            6    58.0    1    0.00     0.0   80    80           80    +0
2    Namaqua Blossom      3    56.0    2    1.40     9.5   79    62           69    -10
3    Corapi               3    50.5    3    3.00     9.5   53    49           49    -4
4    Battleground         5    60.0    4    3.05     0.0   87    87           87    +0
5    Monsieur Chevelle    3    52.0    5    3.75     9.5   62    51           52    -10
6    Afraad               8    57.0    6    5.00     0.0   78    78           78    +0
7    Indian War Dance     3    52.0    7    6.25     9.5   55    49           49    -6
8    Arlington Action     6    56.0    8    7.25     0.0   84    76           76    -8
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Rule Book 80 92 80 +12 0.0 -
2 Namaqua Blossom 79 75 69 +6 9.5 -
3 Corapi 53 67 49 +18 9.5 -
4 Battleground Line 87 92 87 +5 0.0
5 Monsieur Chevelle 62 63 52 +11 9.5 -
6 Afraad 78 79 78 +1 0.0 -
7 Indian War Dance 55 58 49 +9 9.5 -
8 Arlington Action 84 73 76 -3 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