Official NHA Assessment

Race 3: FOR HOSPITALITY BOOKINGS CALL 011 681 1796 MR 89 HANDICAP (Open)

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Line Horse
Arlington Action
Reference for assessment
Exact Matches
0 / 6
Calculated = Official
Close Matches
2 / 6
Within 2 points
Significant Diffs
2 / 6
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    Birthright           4    53.5    1    0.00     3.5   82    63           82    +0
2    Douglas Dragon       3    54.0    2    0.20     7.0   78    57           68    -10
3    Arlington Action     6    54.5    3    1.00     0.0   78    78           78    +0
4    Mount Darwin         3    60.0    4    3.75     7.0   90    71           80    -10
5    Supreme Dance        4    57.5    5    15.00    3.5   84    71           74    -10
6    Vesuvio              5    58.5    6    20.25    0.0   86    80           80    -6
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Birthright 82 95 82 +13 3.5 -
2 Douglas Dragon 78 89 68 +21 7.0 -
3 Arlington Action Line 78 73 78 -5 0.0
4 Mount Darwin 90 81 80 +1 7.0 -
5 Supreme Dance 84 76 74 +2 3.5 -
6 Vesuvio 86 85 80 +5 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