Official NHA Assessment

Race 5: CELEBRATING CENTURION MEMBER LADY CHRISTINE LAIDLAW'S BIRTHDAY CLASS 4 (Open. Benchmark at 60.0kg = 80)

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Line Horse
Empire State
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
0 / 9
Within 2 points
Significant Diffs
9 / 9
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    Regulation           3    55.5    1    0.00     6.0   83    80           80    -3
2    Empire State         3    60.0    2    2.00     6.0   92    92           92    +0
3    Gentleman Joe        3    61.0    3    2.20     6.0   82    94           94    +12
4    Prime Venture        3    58.0    4    2.25     6.0   76    88           88    +12
5    Happy Days           2    56.5    5    3.25     0.0   85    96           96    +11
6    Unicorn Alert        3    59.5    6    3.35     6.0   79    89           89    +10
7    Sir Korski           3    56.5    7    5.85     6.0   85    82           82    -3
8    All About Ronnie     3    55.5    8    8.85     6.0   71    80           80    +9
99   Major Master         3    56.5    99   0.00     6.0   -     82           82    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Regulation 83 105 80 +25 6.0 -
2 Empire State Line 92 99 92 +7 6.0
3 Gentleman Joe 82 83 94 -11 6.0 -
4 Prime Venture 76 78 88 -10 6.0 -
5 Happy Days 85 81 96 -15 0.0 -
6 Unicorn Alert 79 61 89 -28 6.0 -
7 Sir Korski 85 65 82 -17 6.0 -
8 All About Ronnie 71 67 80 -13 6.0 -
99 Major Master - 100 82 +18 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