Official NHA Assessment

Race 7: PERFECTLY PLACED CLASS 5 (Open. Benchmark at 60.0kg = 66)

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Line Horse
True Horizon
Reference for assessment
Exact Matches
1 / 11
Calculated = Official
Close Matches
5 / 11
Within 2 points
Significant Diffs
3 / 11
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    Tambourine Man       5    57.0    1    0.00     0.0   60    59           59    -1
2    Wing Walker          3    61.0    2    1.00     2.5   74    66           66    -8
3    True Horizon         4    56.0    3    1.10     1.5   58    58           58    +0
4    Mighty Mac           5    61.5    4    2.10     0.0   69    71           71    +2
5    Tres Chic            4    59.5    5    2.20     1.5   65    64           64    -1
6    Trippi's Silk        4    62.5    6    2.70     1.5   71    69           69    -2
7    Why Not Jackie       5    59.0    7    3.45     0.0   64    64           64    +0
8    Augusta Blue         5    62.0    8    3.85     0.0   70    70           70    +0
9    Grue Of Ice          6    54.5    9    7.10     0.0   55    54           54    -1
10   Military Messenger   3    54.5    10   10.85    2.5   60    49           50    -10
99   Nile The Boss        4    55.0    99   0.00     1.5   -     52           52    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Tambourine Man 60 64 59 +5 0.0 -
2 Wing Walker 74 87 66 +21 2.5 -
3 True Horizon Line 58 60 58 +2 1.5
4 Mighty Mac 69 52 71 -19 0.0 -
5 Tres Chic 65 52 64 -12 1.5 -
6 Trippi's Silk 71 73 69 +4 1.5 -
7 Why Not Jackie 64 65 64 +1 0.0 -
8 Augusta Blue 70 69 70 -1 0.0 -
9 Grue Of Ice 55 53 54 -1 0.0 -
10 Military Messenger 60 55 50 +5 2.5 -
99 Nile The Boss - 52 52 ✓ Match 1.5 -
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