Official NHA Assessment

Race 1: MERIT RATED 63 HANDICAP (Open)

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Line Horse
Pair Of Aces
Reference for assessment
Exact Matches
0 / 4
Calculated = Official
Close Matches
0 / 4
Within 2 points
Significant Diffs
3 / 4
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    Bruce's Spirit       6    60.0    1    0.00     0.0   63    66           63    +0
2    Pair Of Aces         4    53.0    2    1.00     3.0   50    50           50    +0
3    Duchess Of War       2    57.0    3    3.50     0.0   57    61           61    +4
4    Trust Me             2    54.5    4    6.00     0.0   53    55           55    +2
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Bruce's Spirit 63 55 63 -8 0.0 -
2 Pair Of Aces Line 50 39 50 -11 3.0
3 Duchess Of War 57 55 61 -6 0.0 -
4 Trust Me 53 51 55 -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