Official NHA Assessment

Race 8: KHAYA STABLES DIADEM STAKES (Grade 2) (Weight For Age plus Penalties)

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Line Horse
Royal Aussie
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
2 / 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    Gimme A Prince       3    60.0    1    0.00     4.5   134   123          123   -11
2    Cafe Culture         3    59.0    2    0.75     4.5   114   121          121   +7
3    Questioning          2    58.0    3    1.75     3.0   124   122          122   -2
4    Seeking The Stars    7    58.0    4    2.15     0.0   118   128          128   +10
5    Royal Aussie         2    59.0    5    2.45     3.0   124   124          124   +0
6    Gem King             6    58.0    6    6.20     0.0   101   128          128   +27
7    Future Variety       4    58.0    7    6.50     5.0   114   118          118   +4
8    At My Command        2    58.0    8    6.90     3.0   118   122          122   +4
9    Bereave              4    58.0    9    11.15    5.0   114   118          118   +4
99   Surjay               3    60.0    99   0.00     4.5   -     123          123   +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Gimme A Prince 134 134 123 +11 4.5 -
2 Cafe Culture 114 118 121 -3 4.5 -
3 Questioning 124 127 122 +5 3.0 -
4 Seeking The Stars 118 116 128 -12 0.0 -
5 Royal Aussie Line 124 120 124 -4 3.0
6 Gem King 101 108 128 -20 0.0 -
7 Future Variety 114 116 118 -2 5.0 -
8 At My Command 118 116 122 -6 3.0 -
9 Bereave 114 111 118 -7 5.0 -
99 Surjay - 121 123 -2 4.5 -
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