Official NHA Assessment

Race 1: 4RACING WELCOMES YOU WORK RIDERS MAIDEN PLATE (For all Maidens)

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Line Horse
Hammer Blow
Reference for assessment
Exact Matches
1 / 6
Calculated = Official
Close Matches
1 / 6
Within 2 points
Significant Diffs
5 / 6
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    Hammer Blow          3    60.0    1    0.00     2.5   72    72           72    +0
2    Periodic Table       3    60.0    2    0.30     2.5   -     72           72    +72
3    All On Red           2    60.0    3    5.80     1.5   56    74           74    +18
4    Spirit Of The Sea    3    60.0    4    12.55    2.5   -     72           72    +72
99   Hurricane Power      2    57.5    99   0.00     1.5   -     69           69    +0
99   Velvet Valour        3    60.0    99   0.00     2.5   -     72           72    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Hammer Blow Line 72 72 72 ✓ Match 2.5
2 Periodic Table - - 72 -72 2.5 -
3 All On Red 56 59 74 -15 1.5 -
4 Spirit Of The Sea - - 72 -72 2.5 -
99 Hurricane Power - 60 69 -9 1.5 -
99 Velvet Valour - 53 72 -19 2.5 -
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