Official NHA Assessment

Race 4: WSB GRAND HERITAGE 21 DECEMBER MR 66 HANDICAP (Open)

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Line Horse
Silent Trigger
Reference for assessment
Exact Matches
0 / 11
Calculated = Official
Close Matches
1 / 11
Within 2 points
Significant Diffs
6 / 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    Vava Vegas           5    59.5    1    0.00     0.0   65    62           65    +0
2    Black Lightning      2    58.0    2    0.25     0.0   62    59           59    -3
3    Silent Trigger       6    59.5    3    2.25     0.0   65    65           65    +0
4    Crepuscolo           4    61.0    4    2.85     3.5   69    60           60    -9
5    Futurewolff          5    60.0    5    3.85     0.0   69    64           64    -5
6    Summerland           5    52.0    6    4.25     0.0   45    48           48    +3
7    Callaburn            2    58.5    7    6.45     0.0   64    60           60    -4
8    Breath Of Magic      4    55.0    8    7.45     3.5   65    46           55    -10
9    American Biscuit     3    61.0    9    11.70    7.0   68    51           58    -10
10   Under The Rainbow    3    58.5    10   12.45    7.0   64    46           54    -10
99   Chicago Lass         6    54.5    99   0.00     0.0   -     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 Vava Vegas 65 58 65 -7 0.0 -
2 Black Lightning 62 64 59 +5 0.0 -
3 Silent Trigger Line 65 60 65 -5 0.0
4 Crepuscolo 69 58 60 -2 3.5 -
5 Futurewolff 69 75 64 +11 0.0 -
6 Summerland 45 45 48 -3 0.0 -
7 Callaburn 64 52 60 -8 0.0 -
8 Breath Of Magic 65 60 55 +5 3.5 -
9 American Biscuit 68 65 58 +7 7.0 -
10 Under The Rainbow 64 64 54 +10 7.0 -
99 Chicago Lass - 43 52 -9 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