Official NHA Assessment

Race 5: MWOS BIG SHOP MERIT RATED 91 HANDICAP (Open)

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Line Horse
Wantage
Reference for assessment
Exact Matches
1 / 5
Calculated = Official
Close Matches
2 / 5
Within 2 points
Significant Diffs
1 / 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    Masaaken (AUS)       4    58.5    1    0.00     3.0   88    78           88    +0
2    Wantage              8    60.0    2    1.25     0.0   91    91           91    +0
3    Citrusdal            8    56.5    3    1.50     0.0   84    83           83    -1
4    Differentiate        5    52.5    4    6.50     0.0   76    72           72    -4
5    Tigers Eagle         3    56.0    5    11.50    6.0   84    67           74    -10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Masaaken (AUS) 88 92 88 +4 3.0 -
2 Wantage Line 91 78 91 -13 0.0
3 Citrusdal 84 81 83 -2 0.0 -
4 Differentiate 76 72 72 ✓ Match 0.0 -
5 Tigers Eagle 84 79 74 +5 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