Official NHA Assessment

Race 7: TAB AQUANAUT HANDICAP (Listed) (Open)

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Line Horse
Rule Book
Reference for assessment
Exact Matches
1 / 10
Calculated = Official
Close Matches
3 / 10
Within 2 points
Significant Diffs
5 / 10
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    Crimson King         7    59.5    1    0.00     0.0   103   98           103   +0
2    Red Maple            3    54.0    2    0.50     5.0   93    83           83    -10
3    Rule Book            6    53.0    3    1.60     0.0   90    90           90    +0
4    Indian Ocean         3    53.0    4    2.25     5.0   81    79           79    -2
5    Good Council         2    60.0    5    5.50     0.0   105   99           99    -6
6    Prime Example        2    53.0    6    6.00     0.0   89    85           85    -4
7    Raiseahallelujah     7    57.5    7    7.00     0.0   99    94           94    -5
8    Black Thorn          4    59.0    8    7.25     2.0   102   93           93    -9
9    Top Sail             2    53.0    9    8.00     0.0   91    85           85    -6
10   East Coast           5    59.0    10   24.00    0.0   103   97           97    -6
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Crimson King 103 105 103 +2 0.0 -
2 Red Maple 93 107 83 +24 5.0 -
3 Rule Book Line 90 92 90 +2 0.0
4 Indian Ocean 81 107 79 +28 5.0 -
5 Good Council 105 104 99 +5 0.0 -
6 Prime Example 89 93 85 +8 0.0 -
7 Raiseahallelujah 99 103 94 +9 0.0 -
8 Black Thorn 102 102 93 +9 2.0 -
9 Top Sail 91 85 85 ✓ Match 0.0 -
10 East Coast 103 102 97 +5 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