Official NHA Assessment

Race 4: MERIT RATED 84 HANDICAP F&M (Open)

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Line Horse
Obscure
Reference for assessment
Exact Matches
0 / 5
Calculated = Official
Close Matches
0 / 5
Within 2 points
Significant Diffs
2 / 5
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    Dindingwe            4    60.0    1    0.00     1.5   84    82           84    +0
2    Obscure              4    59.5    2    3.00     1.5   83    83           83    +0
3    Cutback              6    54.0    3    4.00     0.0   72    74           74    +2
4    Tulip Way            5    59.5    4    19.00    0.0   83    84           84    +1
99   Differentiate        5    55.5    99   0.00     0.0   -     76           76    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Dindingwe 84 95 84 +11 1.5 -
2 Obscure Line 83 87 83 +4 1.5
3 Cutback 72 63 74 -11 0.0 -
4 Tulip Way 83 80 84 -4 0.0 -
99 Differentiate - 72 76 -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