Official NHA Assessment

Race 4: TAB MAIDEN SPECIAL WEIGHTS (For all Maidens)

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Line Horse
Run Rudolph Run
Reference for assessment
Exact Matches
1 / 9
Calculated = Official
Close Matches
2 / 9
Within 2 points
Significant Diffs
6 / 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    Machete Man          2    55.0    1    0.00     0.0   74    73           73    -1
2    Guy Alexander        3    55.5    2    1.50     10.0  57    57           57    +0
3    Popping Crease       2    54.5    3    1.90     0.0   73    75           75    +2
4    Run Rudolph Run      3    60.0    4    2.20     10.0  66    66           66    +0
5    I'm A Man            2    53.5    5    3.20     0.0   71    72           72    +1
6    Jack Ryan            2    53.5    6    13.45    0.0   71    70           70    -1
7    Cosmic Empire        3    54.0    7    26.95    10.0  35    51           51    +16
8    Short Sharp Shock    3    59.5    8    38.95    10.0  65    62           62    -3
9    William's Impact     2    58.0    9    45.70    0.0   -     79           79    +79
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Machete Man 74 90 73 +17 0.0 -
2 Guy Alexander 57 72 57 +15 10.0 -
3 Popping Crease 73 74 75 -1 0.0 -
4 Run Rudolph Run Line 66 57 66 -9 10.0
5 I'm A Man 71 69 72 -3 0.0 -
6 Jack Ryan 71 63 70 -7 0.0 -
7 Cosmic Empire 35 33 51 -18 10.0 -
8 Short Sharp Shock 65 62 62 ✓ Match 10.0 -
9 William's Impact - 40 79 -39 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