Official NHA Assessment

Race 4: BETWAY MR 66 HANDICAP (Open)

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Line Horse
Guy Alexander
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
2 / 8
Within 2 points
Significant Diffs
6 / 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    Flag Bearer          3    52.5    1    0.00     9.5   59    49           59    +0
2    Guy Alexander        3    56.0    2    2.50     9.5   58    58           58    +0
3    Callaburn            2    59.5    3    3.60     0.0   67    83           83    +16
4    Full Go              6    57.0    4    3.90     0.0   60    78           78    +18
5    Manz Knight          6    60.0    5    5.25     0.0   66    83           83    +17
6    Cantfoolme           2    55.5    6    5.50     0.0   57    74           74    +17
7    Azucar               3    54.5    7    6.50     9.5   55    53           53    -2
8    Whistledown          4    59.0    8    99.99    6.0   66    69           69    +3
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Flag Bearer 59 60 59 +1 9.5 -
2 Guy Alexander Line 58 72 58 +14 9.5
3 Callaburn 67 52 83 -31 0.0 -
4 Full Go 60 59 78 -19 0.0 -
5 Manz Knight 66 60 83 -23 0.0 -
6 Cantfoolme 57 51 74 -23 0.0 -
7 Azucar 55 53 53 ✓ Match 9.5 -
8 Whistledown 66 63 69 -6 6.0 -
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