Official NHA Assessment

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Line Horse
Perform
Reference for assessment
Exact Matches
1 / 8
Calculated = Official
Close Matches
2 / 8
Within 2 points
Significant Diffs
5 / 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    Explosive Bond       4    56.0    1    0.00     7.0   77    35           35    -42
2    Annewithan E         2    54.5    2    0.40     0.0   58    51           51    -7
3    Outer Dimension      2    56.0    3    3.25     0.0   -     51           51    +51
4    Solo Diva            3    60.0    4    3.50     10.0  63    38           53    -10
5    Perform              2    60.0    5    3.75     0.0   58    58           58    +0
6    Queen Britanna       2    60.0    6    7.00     0.0   59    57           57    -2
7    All Rise             3    57.5    7    7.75     10.0  48    32           38    -10
8    Bomber Grigio        3    60.0    8    9.00     10.0  53    37           43    -10
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Explosive Bond 77 94 35 +59 7.0 -
2 Annewithan E 58 74 51 +23 0.0 -
3 Outer Dimension - 70 51 +19 0.0 -
4 Solo Diva 63 65 53 +12 10.0 -
5 Perform Line 58 54 58 -4 0.0
6 Queen Britanna 59 57 57 ✓ Match 0.0 -
7 All Rise 48 50 38 +12 10.0 -
8 Bomber Grigio 53 42 43 -1 10.0 -
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