Official NHA Assessment

Race 7: KHAYA STABLES DIADEM STAKES (Grade 2) (Weight For Age plus Penalties)

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Line Horse
Bereave
Reference for assessment
Exact Matches
1 / 10
Calculated = Official
Close Matches
2 / 10
Within 2 points
Significant Diffs
7 / 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    Thunderstruck        2    59.0    1    0.00     3.0   124   124          124   +0
2    Future Variety       4    56.0    2    0.30     5.0   106   114          114   +8
3    Bereave              4    60.0    3    0.60     5.0   122   122          122   +0
4    Cosmic Highway       3    60.0    4    0.65     4.5   117   123          123   +6
5    Rio Querari          5    59.0    5    1.15     0.0   118   130          130   +12
6    We're Jamming        5    59.0    6    1.90     0.0   110   130          130   +20
7    Waterberry Lane      6    59.0    7    2.20     0.0   112   130          130   +18
8    Countdown            2    59.0    8    2.50     3.0   107   124          124   +17
9    Silver Falcon        6    59.0    9    2.80     0.0   116   130          130   +14
99   Surjay               3    59.0    99   0.00     4.5   -     121          121   +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Thunderstruck 124 128 124 +4 3.0 -
2 Future Variety 106 116 114 +2 5.0 -
3 Bereave Line 122 111 122 -11 5.0
4 Cosmic Highway 117 115 123 -8 4.5 -
5 Rio Querari 118 116 130 -14 0.0 -
6 We're Jamming 110 108 130 -22 0.0 -
7 Waterberry Lane 112 108 130 -22 0.0 -
8 Countdown 107 106 124 -18 3.0 -
9 Silver Falcon 116 106 130 -24 0.0 -
99 Surjay - 121 121 ✓ Match 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