Official NHA Assessment

Race 9: TAB SA DERBY (Grade 1) (3 year olds (3rd Leg SA Triple Crown))

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Line Horse
Grey Jet
Reference for assessment
Exact Matches
2 / 13
Calculated = Official
Close Matches
5 / 13
Within 2 points
Significant Diffs
6 / 13
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    Legend Of Arthur     3    60.0    1    0.00     6.0   109   108          108   -1
2    Wild Intent          3    60.0    2    0.25     6.0   99    108          108   +9
3    Solar Sail           3    60.0    3    0.45     6.0   86    114          114   +28
4    Olivia's Way         3    57.5    4    4.05     6.0   112   105          105   -7
5    Grey Jet             3    60.0    5    6.95     6.0   108   108          108   +0
6    Immediate Edge       3    60.0    6    11.65    6.0   94    108          108   +14
7    Bacchus              3    60.0    7    15.15    6.0   101   108          108   +7
8    Count Huhtikuu       3    60.0    8    17.40    6.0   79    108          108   +29
9    Don't Cry For Me     3    60.0    9    17.60    6.0   101   108          108   +7
10   Parisian Walkway     3    60.0    10   19.60    6.0   121   108          111   -10
11   Zip Code             3    60.0    11   99.99    6.0   89    108          108   +19
12   Casus Belli          3    60.0    12   99.99    6.0   83    108          108   +25
13   Towers Of Gold       3    60.0    13   99.99    6.0   93    108          108   +15
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Legend Of Arthur 109 110 108 +2 6.0 -
2 Wild Intent 99 110 108 +2 6.0 -
3 Solar Sail 86 109 114 -5 6.0 -
4 Olivia's Way 112 114 105 +9 6.0 -
5 Grey Jet Line 108 108 108 ✓ Match 6.0
6 Immediate Edge 94 108 108 ✓ Match 6.0 -
7 Bacchus 101 101 108 -7 6.0 -
8 Count Huhtikuu 79 101 108 -7 6.0 -
9 Don't Cry For Me 101 103 108 -5 6.0 -
10 Parisian Walkway 121 113 111 +2 6.0 -
11 Zip Code 89 77 108 -31 6.0 -
12 Casus Belli 83 64 108 -44 6.0 -
13 Towers Of Gold 93 93 108 -15 6.0 -
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