Official NHA Assessment

Race 2: TAB 4RACING APP MAIDEN PLATE (For all Maidens)

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Line Horse
Clap Of Thunder
Reference for assessment
Exact Matches
0 / 9
Calculated = Official
Close Matches
0 / 9
Within 2 points
Significant Diffs
8 / 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    River Romeo          2    56.0    1    0.00     0.0   -     62           6     +6
2    Clap Of Thunder      3    60.0    2    0.75     1.0   72    72           72    +0
3    Big Guy              3    58.5    3    1.50     1.0   49    68           68    +19
4    African Torrent      2    56.0    4    1.55     0.0   -     65           65    +65
5    Thermopylae          2    56.0    5    4.00     0.0   -     63           63    +63
6    Warbonnet Creek (IR  4    60.0    6    8.50     0.5   -     69           69    +69
7    Prime Example        2    56.0    7    12.50    0.0   -     62           62    +62
8    Ford Fairlane        2    56.0    8    21.50    0.0   -     62           62    +62
99   Total Protection     2    56.0    99   0.00     0.0   -     62           62    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 River Romeo - 94 6 +88 0.0 -
2 Clap Of Thunder Line 72 66 72 -6 1.0
3 Big Guy 49 60 68 -8 1.0 -
4 African Torrent - 68 65 +3 0.0 -
5 Thermopylae - 54 63 -9 0.0 -
6 Warbonnet Creek (IRE) - 56 69 -13 0.5 -
7 Prime Example - 93 62 +31 0.0 -
8 Ford Fairlane - 41 62 -21 0.0 -
99 Total Protection - 96 62 +34 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