Official NHA Assessment

Race 3: BETWAY AVIATOR MIDDLE STAKES (For horses with nett rating of 101 and below)

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Line Horse
Perfect Witness
Reference for assessment
Exact Matches
0 / 10
Calculated = Official
Close Matches
1 / 10
Within 2 points
Significant Diffs
9 / 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    Perfect Witness      3    57.5    1    0.00     9.5   97    97           97    +0
2    Bey Suyay            4    54.5    2    0.25     6.0   85    98           98    +13
3    Ipso Facto           2    55.5    3    1.75     0.0   95    115          115   +20
4    Destiny Of Souls     2    58.0    4    2.50     0.0   93    119          119   +26
5    Afraad               8    50.0    5    4.00     0.0   77    102          102   +25
6    Terra Time           3    57.5    6    4.50     9.5   95    97           97    +2
7    Scarlett Pimpernel   2    50.0    7    6.00     0.0   94    101          101   +7
8    Raffles              2    60.0    8    22.00    0.0   98    121          121   +23
9    Total Protection     2    57.5    9    99.99    0.0   96    116          116   +20
99   Ocean Warrior        3    62.0    99   0.00     9.5   -     106          106   +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Perfect Witness Line 97 105 97 +8 9.5
2 Bey Suyay 85 84 98 -14 6.0 -
3 Ipso Facto 95 92 115 -23 0.0 -
4 Destiny Of Souls 93 89 119 -30 0.0 -
5 Afraad 77 79 102 -23 0.0 -
6 Terra Time 95 96 97 -1 9.5 -
7 Scarlett Pimpernel 94 90 101 -11 0.0 -
8 Raffles 98 105 121 -16 0.0 -
9 Total Protection 96 96 116 -20 0.0 -
99 Ocean Warrior - 95 106 -11 9.5 -
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