Official NHA Assessment

Race 9: TAB J J THE JET PLANE STAKES (Grade 3) (For all Horses)

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Line Horse
William Robertson
Reference for assessment
Exact Matches
1 / 17
Calculated = Official
Close Matches
4 / 17
Within 2 points
Significant Diffs
6 / 17
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    William Robertson    6    62.0    1    0.00     0.0   124   124          124   +0
2    Taxi To The Moon     3    60.0    2    0.40     3.5   117   113          113   -4
3    Rafa Bay             2    50.0    3    0.80     2.5   94    95           95    +1
4    Constellation        2    56.0    4    1.30     2.5   113   107          107   -6
5    Mover And Shaker     5    56.0    5    1.35     0.0   109   112          112   +3
6    Truth                2    60.0    6    1.40     2.5   120   115          115   -5
7    Green Diamond        2    51.5    7    1.70     2.5   111   98           101   -10
8    Magic Tattoo         5    50.0    8    2.20     0.0   95    100          100   +5
9    Cosmic Star          3    54.0    9    2.40     3.5   106   101          101   -5
10   Mount Pinatubo       2    56.0    10   3.60     2.5   110   107          107   -3
11   Danish Dynamite      2    50.0    11   9.20     2.5   103   95           95    -8
12   Quantum Theory       5    58.0    12   9.40     0.0   112   116          116   +4
13   Chocolate Soldier    3    56.0    13   10.65    3.5   108   105          105   -3
14   Winds Of Change      3    54.0    14   11.85    3.5   102   101          101   -1
15   Ziyasha              2    60.0    15   12.35    2.5   117   115          115   -2
99   Whistle The Tune     2    55.5    99   0.00     2.5   -     106          106   +0
99   Position Of Power    3    50.0    99   0.00     3.5   -     93           93    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 William Robertson Line 124 124 124 ✓ Match 0.0
2 Taxi To The Moon 117 119 113 +6 3.5 -
3 Rafa Bay 94 96 95 +1 2.5 -
4 Constellation 113 114 107 +7 2.5 -
5 Mover And Shaker 109 109 112 -3 0.0 -
6 Truth 120 120 115 +5 2.5 -
7 Green Diamond 111 111 101 +10 2.5 -
8 Magic Tattoo 95 93 100 -7 0.0 -
9 Cosmic Star 106 105 101 +4 3.5 -
10 Mount Pinatubo 110 109 107 +2 2.5 -
11 Danish Dynamite 103 103 95 +8 2.5 -
12 Quantum Theory 112 112 116 -4 0.0 -
13 Chocolate Soldier 108 108 105 +3 3.5 -
14 Winds Of Change 102 102 101 +1 3.5 -
15 Ziyasha 117 118 115 +3 2.5 -
99 Whistle The Tune - 116 106 +10 2.5 -
99 Position Of Power - 90 93 -3 3.5 -
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